feat(web,coder): arena pane — compare 2-6 AI competitors on same prompt

Arena is a new pane kind for competitive AI evaluation. A Battle runs
the same prompt against 2-6 Contestants across two concurrent lanes:
local lane (llama-swap models, serial) and cloud lane (parallel).

Added to all three registries: @boocode/contracts WsFrameSchema,
server InferenceFrame, and web WsFrame.

Backend (apps/coder):
- arena-runner: battle scheduler, lane classifier, benchmark, results
  writer, resume, user winner override
- arena-analyzer: two-stage digest→judge analysis on DEFAULT_MODEL
- arena-decisions: status transitions and resume logic (unit-tested)
- arena-analyzer-helpers: pure helper functions (unit-tested)
- arena-model-call: model call utility for analysis
- arena routes: create/get/list/stop/analyze/cross-examine/winner/diff
- schema: battles, contestants, cross_examinations tables (idempotent)
- remove old /api/arena* routes and tasks.arena_id column

Frontend (apps/web):
- ArenaLauncherDialog: battle type, prompt, contestant selection
- ArenaPane: live roster, streaming output, analysis, cross-exam
- DiffView: unified diff with line-by-line color for coding contests
- Winner override per-row dropdown (Trophy icon)
- battle_updated WS handler for live winner/analysis updates
- arena pane kind in Workspace, ChatTabBar, useSidebar

Cross-app:
- ArenaState and ArenaContestantShape/WsFrame types (contracts)
- battle_* frames in WsFrameSchema, InferenceFrame, and web WsFrame
- manifest.json written per battle results folder
- /Arena added to .gitignore

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
2026-06-06 23:25:29 +00:00
parent e04d0fdaa8
commit d6d246c15b
34 changed files with 4581 additions and 146 deletions

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import { describe, it, expect } from 'vitest';
import {
buildDigestPrompt,
buildJudgePrompt,
buildCrossExamPrompt,
extractWinner,
shouldNameWinner,
type ContestantDigest,
type ContestantDigestInput,
} from '../arena-analyzer-helpers.js';
// ─── shouldNameWinner ─────────────────────────────────────────────────────────
describe('shouldNameWinner', () => {
it('returns false with 0 succeeded contestants', () => {
expect(shouldNameWinner(0)).toBe(false);
});
it('returns false with exactly 1 succeeded contestant', () => {
expect(shouldNameWinner(1)).toBe(false);
});
it('returns true with exactly 2 succeeded contestants', () => {
expect(shouldNameWinner(2)).toBe(true);
});
it('returns true with more than 2 succeeded contestants', () => {
expect(shouldNameWinner(3)).toBe(true);
expect(shouldNameWinner(6)).toBe(true);
});
});
// ─── extractWinner ────────────────────────────────────────────────────────────
describe('extractWinner', () => {
it('extracts identity and model from a WINNER: line', () => {
const output = 'Some analysis\n\nWINNER: claude/opus-4-5\n\nMore text.';
expect(extractWinner(output)).toEqual({ identity: 'claude', model: 'opus-4-5' });
});
it('is case-insensitive for the WINNER keyword', () => {
expect(extractWinner('winner: boocode/qwen3.6-35b')).toEqual({
identity: 'boocode',
model: 'qwen3.6-35b',
});
expect(extractWinner('Winner: opencode/some-model')).toEqual({
identity: 'opencode',
model: 'some-model',
});
});
it('returns null when NO_WINNER is declared', () => {
expect(extractWinner('WINNER: NO_WINNER')).toBeNull();
expect(extractWinner('winner: no_winner')).toBeNull();
});
it('returns null when no WINNER line is present', () => {
expect(extractWinner('Just some analysis text with no verdict.')).toBeNull();
expect(extractWinner('')).toBeNull();
});
it('returns null when the WINNER line has no slash separator', () => {
expect(extractWinner('WINNER: justidentity')).toBeNull();
});
it('returns null when the WINNER line is empty after the colon', () => {
expect(extractWinner('WINNER:')).toBeNull();
expect(extractWinner('WINNER: ')).toBeNull();
});
it('handles leading and trailing whitespace around the slash parts', () => {
const result = extractWinner('WINNER: claude / opus-4-5 ');
expect(result).toEqual({ identity: 'claude', model: 'opus-4-5' });
});
it('picks the first WINNER line when multiple are present', () => {
const output = 'WINNER: claude/opus-4-5\nWINNER: opencode/other-model';
expect(extractWinner(output)).toEqual({ identity: 'claude', model: 'opus-4-5' });
});
it('handles model names that contain slashes by splitting at the first slash only', () => {
// edge case: model name with a slash — should still split at first slash
// identity = 'native', model = 'llama-swap/qwen3.6'
const result = extractWinner('WINNER: native/llama-swap/qwen3.6');
expect(result).toEqual({ identity: 'native', model: 'llama-swap/qwen3.6' });
});
});
// ─── buildDigestPrompt ────────────────────────────────────────────────────────
describe('buildDigestPrompt', () => {
const base: ContestantDigestInput = {
identity: 'claude',
model: 'opus-4-5',
resultMd: '# Output\n\nSome result content.',
benchmarkLine: '12000ms',
};
it('returns an object with non-empty system and user strings', () => {
const { system, user } = buildDigestPrompt(base);
expect(system.length).toBeGreaterThan(0);
expect(user.length).toBeGreaterThan(0);
});
it('includes the contestant identity and model in the user prompt', () => {
const { user } = buildDigestPrompt(base);
expect(user).toContain('claude');
expect(user).toContain('opus-4-5');
});
it('includes the benchmark line in the user prompt', () => {
const { user } = buildDigestPrompt(base);
expect(user).toContain('12000ms');
});
it('includes the result.md content in the user prompt', () => {
const { user } = buildDigestPrompt(base);
expect(user).toContain('Some result content.');
});
it('includes the diff.patch when provided', () => {
const input: ContestantDigestInput = { ...base, diffPatch: '--- a/foo.ts\n+++ b/foo.ts\n+added' };
const { user } = buildDigestPrompt(input);
expect(user).toContain('added');
expect(user).toContain('```diff');
});
it('omits the diff section when diffPatch is undefined', () => {
const { user } = buildDigestPrompt(base);
expect(user).not.toContain('```diff');
});
it('truncates resultMd longer than 8000 characters', () => {
const longResult = 'x'.repeat(10_000);
const { user } = buildDigestPrompt({ ...base, resultMd: longResult });
// The truncated content must not exceed 8000 chars in the sliced section.
// We just check the total user string doesn't balloon unreasonably.
expect(user.length).toBeLessThan(15_000);
});
it('truncates diffPatch longer than 5000 characters', () => {
const longDiff = '+' + 'x'.repeat(10_000);
const { user } = buildDigestPrompt({ ...base, diffPatch: longDiff });
expect(user.length).toBeLessThan(16_000);
});
});
// ─── buildJudgePrompt ─────────────────────────────────────────────────────────
describe('buildJudgePrompt', () => {
const digests: ContestantDigest[] = [
{ identity: 'claude', model: 'opus-4-5', digest: 'Good result.', benchmarkLine: '5000ms' },
{ identity: 'opencode', model: 'qwen3.6', digest: 'Decent result.', benchmarkLine: '8000ms' },
];
it('includes the original prompt in the user section', () => {
const { user } = buildJudgePrompt('Write a sorting algorithm', digests);
expect(user).toContain('Write a sorting algorithm');
});
it('includes each contestant heading in the user section', () => {
const { user } = buildJudgePrompt('prompt', digests);
expect(user).toContain('claude');
expect(user).toContain('opus-4-5');
expect(user).toContain('opencode');
expect(user).toContain('qwen3.6');
});
it('includes each contestant digest text', () => {
const { user } = buildJudgePrompt('prompt', digests);
expect(user).toContain('Good result.');
expect(user).toContain('Decent result.');
});
it('instructs the model to name a WINNER when 2+ digests are provided', () => {
const { system } = buildJudgePrompt('prompt', digests);
expect(system).toContain('WINNER:');
});
it('instructs the model NOT to name a winner when fewer than 2 digests are provided', () => {
const oneDigest = digests.slice(0, 1);
const { system } = buildJudgePrompt('prompt', oneDigest);
expect(system).toContain('NO_WINNER');
expect(system).not.toContain('WINNER: <identity>');
});
it('instructs NO_WINNER when digests list is empty', () => {
const { system } = buildJudgePrompt('prompt', []);
expect(system).toContain('NO_WINNER');
});
it('truncates originalPrompt longer than 2000 characters', () => {
const longPrompt = 'p'.repeat(5_000);
const { user } = buildJudgePrompt(longPrompt, digests);
// Should not contain more than 2000 chars of the prompt.
const promptSection = user.split('# Contestant Digests')[0] ?? '';
expect(promptSection.length).toBeLessThan(3_000);
});
});
// ─── buildCrossExamPrompt ─────────────────────────────────────────────────────
describe('buildCrossExamPrompt', () => {
const digests: ContestantDigest[] = [
{ identity: 'claude', model: 'opus-4-5', digest: 'Strong result.', benchmarkLine: '5000ms' },
{ identity: 'boocode', model: 'qwen3.6-35b', digest: 'Decent result.', benchmarkLine: '12000ms' },
];
const baseOpts = {
originalPrompt: 'Write a sorting algorithm.',
digests,
analysisContent: '# Arena Analysis\n\nClaude did better.\n\nWINNER: claude/opus-4-5',
proposedWinner: 'claude/opus-4-5',
examinerIdentity: 'goose',
examinerModel: 'gpt-4o',
};
it('includes the examiner identity and model in the system prompt', () => {
const { system } = buildCrossExamPrompt(baseOpts);
expect(system).toContain('goose');
expect(system).toContain('gpt-4o');
});
it('includes the original prompt in the user section', () => {
const { user } = buildCrossExamPrompt(baseOpts);
expect(user).toContain('Write a sorting algorithm.');
});
it('includes each contestant digest', () => {
const { user } = buildCrossExamPrompt(baseOpts);
expect(user).toContain('Strong result.');
expect(user).toContain('Decent result.');
});
it('includes the proposed analysis content', () => {
const { user } = buildCrossExamPrompt(baseOpts);
expect(user).toContain('Claude did better.');
});
it('includes the proposed winner when set', () => {
const { user } = buildCrossExamPrompt(baseOpts);
expect(user).toContain('claude/opus-4-5');
});
it('notes that no winner was proposed when proposedWinner is null', () => {
const { user } = buildCrossExamPrompt({ ...baseOpts, proposedWinner: null });
expect(user).toContain('No winner was proposed');
});
it('instructs the examiner to provide a VERDICT line', () => {
const { system } = buildCrossExamPrompt(baseOpts);
expect(system).toContain('VERDICT:');
});
});

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import { describe, it, expect } from 'vitest';
import {
classifyLane,
nextLocalContestant,
isBattleComplete,
computeBenchmark,
sanitizeSlug,
buildBattleSlug,
buildContestantDir,
reconcileContestantResume,
reconcileContestants,
type ContestantSlot,
} from '../arena-decisions.js';
// Local models = what the llama-swap server actually serves.
const LOCAL_MODELS: ReadonlySet<string> = new Set([
'qwen3.6-35b-a3b-mxfp4',
'qwen2.5-coder-7b',
]);
// ─── classifyLane ────────────────────────────────────────────────────────────
describe('classifyLane', () => {
it('classifies qa battles as local regardless of identity or model', () => {
expect(classifyLane('qa', 'boocode', 'qwen3.6-35b-a3b-mxfp4', LOCAL_MODELS)).toBe('local');
expect(classifyLane('qa', 'claude', 'claude-opus-4-5', LOCAL_MODELS)).toBe('local');
expect(classifyLane('qa', 'Debugger', 'cloud-model', new Set())).toBe('local');
expect(classifyLane('qa', 'opencode', 'any-model', LOCAL_MODELS)).toBe('local');
});
it('classifies coding contestants as local when model is in localModels', () => {
expect(classifyLane('coding', 'boocode', 'qwen3.6-35b-a3b-mxfp4', LOCAL_MODELS)).toBe('local');
expect(classifyLane('coding', 'opencode', 'qwen3.6-35b-a3b-mxfp4', LOCAL_MODELS)).toBe('local');
expect(classifyLane('coding', 'qwen', 'qwen2.5-coder-7b', LOCAL_MODELS)).toBe('local');
});
it('classifies coding contestants as cloud when model is not in localModels', () => {
expect(classifyLane('coding', 'claude', 'claude-opus-4-5', LOCAL_MODELS)).toBe('cloud');
expect(classifyLane('coding', 'opencode', 'claude-opus-4-5', LOCAL_MODELS)).toBe('cloud');
expect(classifyLane('coding', 'goose', 'gpt-4o', LOCAL_MODELS)).toBe('cloud');
expect(classifyLane('coding', 'qwen', 'unknown-remote-model', LOCAL_MODELS)).toBe('cloud');
});
it('uses the injected localModels set, not a hardcoded list', () => {
const custom = new Set(['my-local-model']);
expect(classifyLane('coding', 'any-agent', 'my-local-model', custom)).toBe('local');
expect(classifyLane('coding', 'boocode', 'other-model', custom)).toBe('cloud');
});
it('defaults to cloud for an empty localModels set', () => {
expect(classifyLane('coding', 'boocode', 'qwen3.6-35b-a3b-mxfp4', new Set())).toBe('cloud');
expect(classifyLane('coding', 'native', 'any-local-model', new Set())).toBe('cloud');
});
});
// ─── nextLocalContestant ─────────────────────────────────────────────────────
describe('nextLocalContestant', () => {
it('returns null for an empty list', () => {
expect(nextLocalContestant([])).toBeNull();
});
it('returns null when no local contestants are queued', () => {
const slots: ContestantSlot[] = [
{ id: 'c1', lane: 'local', status: 'running' },
{ id: 'c2', lane: 'cloud', status: 'queued' },
];
expect(nextLocalContestant(slots)).toBeNull();
});
it('returns the first queued local contestant in order', () => {
const slots: ContestantSlot[] = [
{ id: 'c1', lane: 'local', status: 'done' },
{ id: 'c2', lane: 'local', status: 'queued' },
{ id: 'c3', lane: 'local', status: 'queued' },
];
expect(nextLocalContestant(slots)).toBe('c2');
});
it('skips done/error local contestants and cloud contestants', () => {
const slots: ContestantSlot[] = [
{ id: 'c1', lane: 'cloud', status: 'queued' },
{ id: 'c2', lane: 'local', status: 'error' },
{ id: 'c3', lane: 'local', status: 'queued' },
];
expect(nextLocalContestant(slots)).toBe('c3');
});
it('returns null when all local contestants are done or error', () => {
const slots: ContestantSlot[] = [
{ id: 'c1', lane: 'local', status: 'done' },
{ id: 'c2', lane: 'local', status: 'error' },
];
expect(nextLocalContestant(slots)).toBeNull();
});
});
// ─── isBattleComplete ────────────────────────────────────────────────────────
describe('isBattleComplete', () => {
it('returns false for an empty list', () => {
expect(isBattleComplete([])).toBe(false);
});
it('returns true when all contestants are done', () => {
expect(isBattleComplete([{ status: 'done' }, { status: 'done' }])).toBe(true);
});
it('returns true when all contestants are error', () => {
expect(isBattleComplete([{ status: 'error' }, { status: 'error' }])).toBe(true);
});
it('returns true for a mixed done/error result', () => {
expect(isBattleComplete([{ status: 'done' }, { status: 'error' }, { status: 'done' }])).toBe(true);
});
it('returns false while any contestant is still running', () => {
expect(isBattleComplete([{ status: 'done' }, { status: 'running' }])).toBe(false);
});
it('returns false while any contestant is still queued', () => {
expect(isBattleComplete([{ status: 'done' }, { status: 'queued' }])).toBe(false);
});
});
// ─── computeBenchmark ────────────────────────────────────────────────────────
describe('computeBenchmark', () => {
const t0 = new Date('2026-06-06T10:00:00.000Z');
const t1 = new Date('2026-06-06T10:00:05.000Z'); // +5 000ms
it('computes duration in ms for both lanes', () => {
const local = computeBenchmark(t0, t1, 100, 'local');
expect(local.durationMs).toBe(5000);
const cloud = computeBenchmark(t0, t1, null, 'cloud');
expect(cloud.durationMs).toBe(5000);
});
it('computes tokens/sec for local lane when costTokens is known', () => {
const bench = computeBenchmark(t0, t1, 500, 'local');
expect(bench.tokensPerSec).toBeCloseTo(100, 5); // 500 / 5 = 100 tok/s
});
it('omits tokens/sec for cloud lane regardless of costTokens', () => {
const bench = computeBenchmark(t0, t1, 500, 'cloud');
expect(bench.tokensPerSec).toBeNull();
});
it('omits tokens/sec for local lane when costTokens is null', () => {
const bench = computeBenchmark(t0, t1, null, 'local');
expect(bench.tokensPerSec).toBeNull();
});
it('returns durationMs = 0 and null tokensPerSec when timestamps are equal', () => {
const bench = computeBenchmark(t0, t0, 100, 'local');
expect(bench.durationMs).toBe(0);
expect(bench.tokensPerSec).toBeNull();
});
it('clamps negative duration to 0 (clock skew)', () => {
const bench = computeBenchmark(t1, t0, 50, 'local');
expect(bench.durationMs).toBe(0);
expect(bench.tokensPerSec).toBeNull();
});
});
// ─── sanitizeSlug ────────────────────────────────────────────────────────────
describe('sanitizeSlug', () => {
it('lowercases and preserves alphanumeric + hyphens', () => {
expect(sanitizeSlug('claude')).toBe('claude');
expect(sanitizeSlug('claude-opus-4-5')).toBe('claude-opus-4-5');
});
it('replaces spaces and special characters with hyphens', () => {
expect(sanitizeSlug('Code Reviewer')).toBe('code-reviewer');
expect(sanitizeSlug('native/boocode')).toBe('native-boocode');
expect(sanitizeSlug('qwen2.5-coder-35b')).toBe('qwen2-5-coder-35b');
});
it('collapses consecutive non-alphanumeric runs to a single hyphen', () => {
expect(sanitizeSlug('foo bar---baz')).toBe('foo-bar-baz');
});
it('strips leading and trailing hyphens', () => {
expect(sanitizeSlug('---foo---')).toBe('foo');
});
it('truncates to 64 characters', () => {
const long = 'a'.repeat(100);
expect(sanitizeSlug(long).length).toBe(64);
});
});
// ─── buildBattleSlug ─────────────────────────────────────────────────────────
describe('buildBattleSlug', () => {
it('builds a deterministic dated slug from id, type, and createdAt', () => {
const id = 'a1b2c3d4-e5f6-7890-abcd-ef1234567890';
const createdAt = new Date('2026-06-06T12:00:00.000Z');
const slug = buildBattleSlug(id, 'coding', createdAt);
expect(slug).toBe('2026-06-06-coding-a1b2c3d4');
});
it('includes the battle type in the slug', () => {
const id = 'aaaaaaaa-0000-0000-0000-000000000000';
const createdAt = new Date('2026-01-01T00:00:00.000Z');
expect(buildBattleSlug(id, 'qa', createdAt)).toContain('-qa-');
expect(buildBattleSlug(id, 'coding', createdAt)).toContain('-coding-');
});
it('uses the first 8 hex chars of the uuid (dashes stripped)', () => {
const id = 'deadbeef-0000-0000-0000-000000000000';
const slug = buildBattleSlug(id, 'coding', new Date('2026-06-06T00:00:00Z'));
expect(slug.endsWith('-deadbeef')).toBe(true);
});
});
// ─── buildContestantDir ──────────────────────────────────────────────────────
describe('buildContestantDir', () => {
it('joins sanitized identity and model with a hyphen', () => {
expect(buildContestantDir('claude', 'claude-opus-4-5')).toBe('claude-claude-opus-4-5');
});
it('sanitizes both parts independently', () => {
expect(buildContestantDir('Code Reviewer', 'qwen2.5-35b')).toBe('code-reviewer-qwen2-5-35b');
});
});
// ─── reconcileContestantResume ───────────────────────────────────────────────
describe('reconcileContestantResume', () => {
it('keeps non-running contestants regardless of task state', () => {
for (const status of ['queued', 'done', 'error']) {
expect(reconcileContestantResume(status, 'tid', 'completed')).toBe('keep');
expect(reconcileContestantResume(status, null, null)).toBe('keep');
}
});
it('re-dispatches a running contestant with no task_id', () => {
expect(reconcileContestantResume('running', null, null)).toBe('re-dispatch');
});
it('re-dispatches a running contestant whose task row is absent', () => {
expect(reconcileContestantResume('running', 'tid', null)).toBe('re-dispatch');
});
it('marks done when the task completed before the terminal callback ran', () => {
expect(reconcileContestantResume('running', 'tid', 'completed')).toBe('mark-done');
});
it('marks error when the task failed', () => {
expect(reconcileContestantResume('running', 'tid', 'failed')).toBe('mark-error');
});
it('marks cancelled when the task was cancelled', () => {
expect(reconcileContestantResume('running', 'tid', 'cancelled')).toBe('mark-cancelled');
});
it('keeps a running contestant whose task is pending (dispatcher handles it)', () => {
expect(reconcileContestantResume('running', 'tid', 'pending')).toBe('keep');
});
it('re-dispatches when the task is stuck running (process died)', () => {
expect(reconcileContestantResume('running', 'tid', 'running')).toBe('re-dispatch');
});
it('re-dispatches when the task is blocked (permission dialog gone on restart)', () => {
expect(reconcileContestantResume('running', 'tid', 'blocked')).toBe('re-dispatch');
});
});
// ─── reconcileContestants ────────────────────────────────────────────────────
describe('reconcileContestants', () => {
it('returns one decision per contestant', () => {
const contestants = [
{ contestantId: 'c1', taskId: null, status: 'done' },
{ contestantId: 'c2', taskId: 't1', status: 'running' },
{ contestantId: 'c3', taskId: 't2', status: 'running' },
];
const taskStates = new Map([['t1', 'completed'], ['t2', 'running']]);
const decisions = reconcileContestants(contestants, taskStates);
expect(decisions).toHaveLength(3);
expect(decisions[0]).toEqual({ contestantId: 'c1', action: 'keep' });
expect(decisions[1]).toEqual({ contestantId: 'c2', action: 'mark-done' });
expect(decisions[2]).toEqual({ contestantId: 'c3', action: 're-dispatch' });
});
it('re-dispatches a running contestant whose taskId is absent from taskStates', () => {
const contestants = [{ contestantId: 'c1', taskId: 'orphan', status: 'running' }];
const decisions = reconcileContestants(contestants, new Map());
expect(decisions[0]?.action).toBe('re-dispatch');
});
it('re-dispatches a running contestant with null taskId', () => {
const contestants = [{ contestantId: 'c1', taskId: null, status: 'running' }];
const decisions = reconcileContestants(contestants, new Map());
expect(decisions[0]?.action).toBe('re-dispatch');
});
it('returns empty array for no contestants', () => {
expect(reconcileContestants([], new Map())).toEqual([]);
});
it('keeps a running contestant whose task is pending', () => {
const contestants = [{ contestantId: 'c1', taskId: 't1', status: 'running' }];
const taskStates = new Map([['t1', 'pending']]);
const decisions = reconcileContestants(contestants, taskStates);
expect(decisions[0]?.action).toBe('keep');
});
it('handles a mixed battle: done/queued kept, stale running re-dispatched', () => {
const contestants = [
{ contestantId: 'c1', taskId: 't1', status: 'done' },
{ contestantId: 'c2', taskId: null, status: 'queued' },
{ contestantId: 'c3', taskId: 't2', status: 'running' },
{ contestantId: 'c4', taskId: 't3', status: 'running' },
];
const taskStates = new Map([
['t1', 'completed'],
['t2', 'running'], // stuck — process dead
['t3', 'pending'], // dispatcher will handle
]);
const decisions = reconcileContestants(contestants, taskStates);
expect(decisions.find((d) => d.contestantId === 'c1')?.action).toBe('keep');
expect(decisions.find((d) => d.contestantId === 'c2')?.action).toBe('keep');
expect(decisions.find((d) => d.contestantId === 'c3')?.action).toBe('re-dispatch');
expect(decisions.find((d) => d.contestantId === 'c4')?.action).toBe('keep');
});
});

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/**
* Pure, side-effect-free helpers for the Arena analyzer.
* No DB, no IO, no network — safe to unit-test directly.
*
* Covers: digest-prompt assembly, judge-prompt assembly, winner extraction
* from the judge output, the <2-survivors no-winner rule, and the
* cross-examination prompt.
*/
// ─── Shared types ─────────────────────────────────────────────────────────────
export interface ContestantDigestInput {
identity: string;
model: string;
resultMd: string;
diffPatch?: string;
benchmarkLine: string;
}
export interface ContestantDigest {
identity: string;
model: string;
digest: string;
benchmarkLine: string;
}
// ─── Digest stage ─────────────────────────────────────────────────────────────
/**
* Build the system + user prompts for the per-contestant digest call.
* The digest is a short structured summary; it keeps each call's context small
* so the downstream judge only sees digests (not raw diffs).
*/
export function buildDigestPrompt(input: ContestantDigestInput): { system: string; user: string } {
const system =
'You are an expert technical analyst evaluating the output of an AI coding or Q&A battle. ' +
'Produce a concise structured digest (under 300 words, Markdown bullet points) covering: ' +
'(1) correctness and quality, (2) completeness, (3) notable strengths, (4) notable weaknesses or issues. ' +
'Do not reference the battle or other contestants — focus only on this submission.';
const parts: string[] = [
`# Contestant: ${input.identity} / ${input.model}`,
`\nBenchmark: ${input.benchmarkLine}`,
'\n## Result\n',
input.resultMd.slice(0, 8_000),
];
if (input.diffPatch) {
parts.push('\n## Code Changes (diff)\n```diff');
parts.push(input.diffPatch.slice(0, 5_000));
parts.push('```');
}
return { system, user: parts.join('\n') };
}
// ─── Judge stage ──────────────────────────────────────────────────────────────
/**
* Build the system + user prompts for the comparative judge call.
* Receives contestant digests (NOT raw diffs) to keep context bounded.
*
* The judge output must contain a line starting with WINNER: or NO_WINNER.
* The caller extracts it with extractWinner().
*/
export function buildJudgePrompt(
originalPrompt: string,
digests: ContestantDigest[],
): { system: string; user: string } {
const canName = shouldNameWinner(digests.length);
const winnerInstruction = canName
? 'After your comparative analysis, name the best submission on its own line in this exact format:\n' +
'WINNER: <identity>/<model>\n' +
'where <identity> and <model> exactly match the heading above. No other text on that line.'
: 'Fewer than 2 contestants succeeded. Do NOT name a winner. Write the following on its own line:\nNO_WINNER';
const system =
'You are an expert judge for an AI battle. You have received digest summaries of each ' +
"contestant's work on the same task. Write a comparative analysis, then follow these instructions:\n" +
winnerInstruction;
const parts: string[] = [
'# Original Task Prompt\n',
originalPrompt.slice(0, 2_000),
'\n# Contestant Digests\n',
];
for (const d of digests) {
parts.push(`\n## ${d.identity} / ${d.model}`);
parts.push(`Benchmark: ${d.benchmarkLine}`);
parts.push(d.digest);
}
parts.push(
'\n# Instructions\nCompare the contestants and follow the winner-naming instructions above.',
);
return { system, user: parts.join('\n') };
}
// ─── No-winner rule ───────────────────────────────────────────────────────────
/**
* Returns true when enough contestants succeeded to name a winner.
* Rule: at least 2 must have produced a result. With 0 or 1 success the
* analysis must NOT name a winner (no meaningful comparison possible).
*/
export function shouldNameWinner(succeededCount: number): boolean {
return succeededCount >= 2;
}
// ─── Winner extraction ────────────────────────────────────────────────────────
/**
* Parse the judge's text output and extract the declared winner.
* Looks for a line matching: WINNER: <identity>/<model>
* Returns null when no valid winner line is found, or when the line contains
* NO_WINNER.
*
* The parse is lenient on surrounding whitespace and case for the keyword.
*/
export function extractWinner(judgeOutput: string): { identity: string; model: string } | null {
for (const line of judgeOutput.split('\n')) {
const trimmed = line.trim();
if (!trimmed.toUpperCase().startsWith('WINNER:')) continue;
const rest = trimmed.slice('WINNER:'.length).trim();
if (rest.toUpperCase() === 'NO_WINNER' || rest === '') return null;
const slashIdx = rest.indexOf('/');
if (slashIdx === -1) return null;
const identity = rest.slice(0, slashIdx).trim();
const model = rest.slice(slashIdx + 1).trim();
if (identity && model) return { identity, model };
}
return null;
}
// ─── Cross-examination stage ──────────────────────────────────────────────────
/**
* Build the system + user prompts for a cross-examination call.
* The cross-examiner sees the original prompt, contestant digests, and the
* proposed analysis, and is asked to challenge the result.
*/
export function buildCrossExamPrompt(opts: {
originalPrompt: string;
digests: ContestantDigest[];
analysisContent: string;
proposedWinner: string | null;
examinerIdentity: string;
examinerModel: string;
}): { system: string; user: string } {
const system =
`You are ${opts.examinerIdentity} (model: ${opts.examinerModel}), acting as an independent ` +
'cross-examiner in an AI battle. Your role is to critically challenge the proposed analysis ' +
'and winner, then give your own verdict. Be rigorous but fair. ' +
'End your response with your verdict on its own line:\n' +
'VERDICT: <identity>/<model> — if you agree or disagree with the proposed winner but can name one\n' +
'VERDICT: NO_WINNER — if no clear winner exists';
const parts: string[] = [
'# Original Task Prompt\n',
opts.originalPrompt.slice(0, 2_000),
'\n# Contestant Digests\n',
];
for (const d of opts.digests) {
parts.push(`\n## ${d.identity} / ${d.model}`);
parts.push(`Benchmark: ${d.benchmarkLine}`);
parts.push(d.digest);
}
parts.push('\n# Proposed Analysis\n');
parts.push(opts.analysisContent.slice(0, 5_000));
if (opts.proposedWinner) {
parts.push(`\n*(Proposed winner: ${opts.proposedWinner})*`);
} else {
parts.push('\n*(No winner was proposed — fewer than 2 contestants succeeded.)*');
}
parts.push(
'\n# Your Cross-Examination\n' +
'Challenge the analysis above, then give your independent verdict (VERDICT: … on its own line).',
);
return { system, user: parts.join('\n') };
}

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/**
* Arena Analyzer — pluggable seam for battle analysis and cross-examination.
*
* The Analyzer interface is the plug point: a v2 Han Orchestrator flow can
* replace the v1 two-stage digest→judge implementation without a schema change.
*
* v1 implementation uses DEFAULT_MODEL via direct llama-swap calls (arenaModelCall):
* Digest stage — one call per succeeded contestant, concurrent; produces a
* bounded summary of each result (result.md + diff.patch for
* coding, result.md for Q&A).
* Judge stage — one call with all digests + the original prompt; writes
* analysis.md, names a winner (unless < 2 succeeded), and
* updates battles.winner_contestant_id.
*
* Cross-examination:
* Local model — direct arenaModelCall to llama-swap with the chosen model.
* Cloud model — inserts a tasks row (triggers the dispatcher via pg_notify);
* polls for completion; reads output_summary as the verdict.
* In both cases the verdict is written to cross_examinations.verdict, appended
* to <resultsPath>/cross-exam.md, and a battle_updated frame is published.
*
* Never throws — all errors are caught, logged, and swallowed so the caller
* (arena-runner's onBattleComplete / onCrossExamStart) is never wedged.
*/
import { readFile, writeFile, mkdir } from 'node:fs/promises';
import { join } from 'node:path';
import type { Sql } from '../db.js';
import type { Broker } from '@boocode/server/broker';
import type { WsFrame } from '@boocode/contracts/ws-frames';
import type { FastifyBaseLogger } from 'fastify';
import type { Config } from '../config.js';
import type { BattleType } from '@boocode/contracts/arena';
import { arenaModelCall } from './arena-model-call.js';
import {
buildDigestPrompt,
buildJudgePrompt,
buildCrossExamPrompt,
extractWinner,
shouldNameWinner,
type ContestantDigest,
} from './arena-analyzer-helpers.js';
// ─── Public interface ─────────────────────────────────────────────────────────
/** Pluggable analysis seam — swap to a Han Orchestrator flow in v2. */
export interface Analyzer {
/** Run the two-stage digest→judge analysis for a completed battle. */
analyze(battleId: string): Promise<void>;
/**
* Run a cross-examination for an already-inserted cross_examinations row.
* The result is written back to that row and a battle_updated frame is published.
*/
crossExamine(
battleId: string,
crossExamId: string,
opts: { identity: string; model: string },
): Promise<void>;
}
// ─── Internal DB row types ────────────────────────────────────────────────────
interface BattleRow {
id: string;
project_id: string;
battle_type: BattleType;
prompt: string;
status: string;
results_path: string | null;
winner_contestant_id: string | null;
}
interface ContestantRow {
id: string;
identity: string;
model: string;
lane: string;
status: string;
result_path: string | null;
duration_ms: number | null;
tokens_per_sec: number | null;
}
// ─── Factory ──────────────────────────────────────────────────────────────────
interface AnalyzerDeps {
sql: Sql;
broker: Broker;
log: FastifyBaseLogger;
config: Pick<Config, 'LLAMA_SWAP_URL' | 'DEFAULT_MODEL'>;
/** Model IDs served by local llama-swap — cross-exam routing uses this. */
localModels: ReadonlySet<string>;
}
export function createAnalyzer(deps: AnalyzerDeps): Analyzer {
const { sql, broker, log, config, localModels } = deps;
// ─── analyze ──────────────────────────────────────────────────────────────
async function analyze(battleId: string): Promise<void> {
try {
await runAnalysis(battleId);
} catch (err) {
log.error(
{ err: errMsg(err), battleId },
'arena-analyzer: analysis failed',
);
}
}
async function runAnalysis(battleId: string): Promise<void> {
const battle = await loadBattle(battleId);
if (!battle) {
log.warn({ battleId }, 'arena-analyzer: battle not found');
return;
}
const contestants = await loadContestants(battleId);
const succeeded = contestants.filter((c) => c.status === 'done' && c.result_path);
log.info(
{ battleId, total: contestants.length, succeeded: succeeded.length },
'arena-analyzer: starting analysis',
);
// Digest stage — concurrent, one call per succeeded contestant.
const digests = (
await Promise.all(succeeded.map((c) => digestContestant(battle, c)))
).filter((d): d is ContestantDigest => d !== null);
// Failed contestants are noted in the analysis even if they produced no digest.
const failedNotes = contestants
.filter((c) => c.status === 'error')
.map((c) => `- **${c.identity} / ${c.model}**: failed (no result)\n`);
// Judge stage — single call with all digests.
const { analysisText, winner } = await judgeContestants(battle, digests, failedNotes);
// Write analysis.md to the battle results folder.
const resultsPath = battle.results_path;
if (resultsPath) {
await mkdir(resultsPath, { recursive: true });
await writeFile(join(resultsPath, 'analysis.md'), analysisText, 'utf8');
}
// Resolve the winner to a contestant id and update the battle row.
let winnerId: string | null = null;
if (winner && shouldNameWinner(succeeded.length)) {
const winnerContestant = contestants.find(
(c) => c.identity === winner.identity && c.model === winner.model,
);
if (winnerContestant) {
winnerId = winnerContestant.id;
await sql`
UPDATE battles
SET winner_contestant_id = ${winnerId}, updated_at = clock_timestamp()
WHERE id = ${battleId}
`;
log.info({ battleId, winnerId, identity: winner.identity, model: winner.model }, 'arena-analyzer: winner set');
} else {
log.warn({ battleId, winner }, 'arena-analyzer: judge named a winner not found in contestants');
}
}
publishUser({
type: 'battle_updated',
battle_id: battleId,
winner_contestant_id: winnerId,
analysis_ready: true,
});
log.info({ battleId }, 'arena-analyzer: analysis complete');
}
// ─── crossExamine ─────────────────────────────────────────────────────────
async function crossExamine(
battleId: string,
crossExamId: string,
opts: { identity: string; model: string },
): Promise<void> {
try {
await runCrossExam(battleId, crossExamId, opts);
} catch (err) {
log.error(
{ err: errMsg(err), battleId, crossExamId },
'arena-analyzer: cross-exam failed',
);
}
}
async function runCrossExam(
battleId: string,
crossExamId: string,
opts: { identity: string; model: string },
): Promise<void> {
const battle = await loadBattle(battleId);
if (!battle) {
log.warn({ battleId }, 'arena-analyzer: battle not found for cross-exam');
return;
}
const contestants = await loadContestants(battleId);
// Re-read the digests (if contestants have results) for context.
const succeeded = contestants.filter((c) => c.status === 'done' && c.result_path);
const digests = (
await Promise.all(succeeded.map((c) => digestContestant(battle, c)))
).filter((d): d is ContestantDigest => d !== null);
// Read analysis.md for the proposed analysis content.
let analysisContent = '';
if (battle.results_path) {
analysisContent = await readFile(
join(battle.results_path, 'analysis.md'), 'utf8',
).catch(() => '');
}
// Resolve proposed winner label.
let proposedWinner: string | null = null;
if (battle.winner_contestant_id) {
const w = contestants.find((c) => c.id === battle.winner_contestant_id);
if (w) proposedWinner = `${w.identity}/${w.model}`;
}
const { system, user } = buildCrossExamPrompt({
originalPrompt: battle.prompt,
digests,
analysisContent,
proposedWinner,
examinerIdentity: opts.identity,
examinerModel: opts.model,
});
log.info({ battleId, crossExamId, identity: opts.identity, model: opts.model }, 'arena-analyzer: running cross-exam');
const verdict = await executeModelCall({
battleId,
projectId: battle.project_id,
identity: opts.identity,
model: opts.model,
system,
user,
});
// Persist verdict and append to cross-exam.md.
await sql`
UPDATE cross_examinations
SET verdict = ${verdict}
WHERE id = ${crossExamId}
`;
if (battle.results_path) {
const crossExamPath = join(battle.results_path, 'cross-exam.md');
const section =
`\n---\n\n# Cross-Examination by ${opts.identity} / ${opts.model}\n\n` +
`${verdict}\n`;
await writeFile(crossExamPath, section, { flag: 'a', encoding: 'utf8' });
}
publishUser({
type: 'battle_updated',
battle_id: battleId,
cross_exam_id: crossExamId,
});
log.info({ battleId, crossExamId }, 'arena-analyzer: cross-exam complete');
}
// ─── Model call routing ───────────────────────────────────────────────────
/**
* Route a one-shot model call to llama-swap (local) or the task dispatcher
* (cloud). Cloud dispatch inserts a tasks row and polls for completion.
*/
async function executeModelCall(opts: {
battleId: string;
projectId: string;
identity: string;
model: string;
system: string;
user: string;
}): Promise<string> {
const isLocal = localModels.has(opts.model) || localModels.has(`llama-swap/${opts.model}`);
if (isLocal) {
return arenaModelCall({
config,
model: opts.model,
system: opts.system,
user: opts.user,
maxTokens: 2_000,
temperature: 0.3,
});
}
// Cloud path: dispatch through the task system and poll for completion.
return executeCloudModelCall(opts);
}
async function executeCloudModelCall(opts: {
projectId: string;
identity: string;
model: string;
system: string;
user: string;
}): Promise<string> {
// The cross-exam prompt is the full input to the external agent. We embed
// the system prompt as a preamble in the user message (external agents don't
// take a separate system arg through the tasks dispatcher).
const input = `${opts.system}\n\n${opts.user}`;
// For well-known external agents, stamp the agent name so the dispatcher
// routes via PTY/ACP. For unknown identities fall back to native inference
// (agent = null → DEFAULT_MODEL text generation).
const knownAgents = new Set(['claude', 'opencode', 'qwen', 'goose']);
const agentName = knownAgents.has(opts.identity) ? opts.identity : null;
const [task] = await sql<{ id: string }[]>`
INSERT INTO tasks (project_id, input, agent, model)
VALUES (${opts.projectId}, ${input}, ${agentName}, ${opts.model})
RETURNING id
`;
const taskId = task!.id;
log.info({ taskId, identity: opts.identity, model: opts.model }, 'arena-analyzer: cloud cross-exam task dispatched');
// Poll until terminal (up to 5 minutes).
const timeoutMs = 5 * 60 * 1_000;
const pollMs = 2_000;
const deadline = Date.now() + timeoutMs;
while (Date.now() < deadline) {
await sleep(pollMs);
const [row] = await sql<{ state: string; output_summary: string | null }[]>`
SELECT state, output_summary FROM tasks WHERE id = ${taskId}
`;
if (!row) break;
if (row.state === 'completed') return row.output_summary ?? '';
if (row.state === 'failed' || row.state === 'cancelled') {
throw new Error(`cross-exam task ${row.state}: ${row.output_summary ?? ''}`);
}
}
throw new Error(`cloud cross-exam task timed out after ${timeoutMs / 1000}s`);
}
// ─── Digest helper ────────────────────────────────────────────────────────
async function digestContestant(
battle: BattleRow,
c: ContestantRow,
): Promise<ContestantDigest | null> {
if (!c.result_path) return null;
const resultMd = await readFile(join(c.result_path, 'result.md'), 'utf8').catch(() => '');
let diffPatch: string | undefined;
if (battle.battle_type === 'coding') {
diffPatch = await readFile(join(c.result_path, 'diff.patch'), 'utf8').catch(
() => undefined,
);
}
const benchmarkLine = formatBenchmarkLine(c);
const { system, user } = buildDigestPrompt({
identity: c.identity,
model: c.model,
resultMd,
diffPatch,
benchmarkLine,
});
let digest: string;
try {
digest = await arenaModelCall({
config,
model: config.DEFAULT_MODEL,
system,
user,
maxTokens: 500,
temperature: 0.3,
});
} catch (err) {
log.warn(
{ err: errMsg(err), identity: c.identity, model: c.model },
'arena-analyzer: digest call failed — skipping contestant',
);
return null;
}
return { identity: c.identity, model: c.model, digest, benchmarkLine };
}
// ─── Judge helper ─────────────────────────────────────────────────────────
async function judgeContestants(
battle: BattleRow,
digests: ContestantDigest[],
failedNotes: string[],
): Promise<{ analysisText: string; winner: { identity: string; model: string } | null }> {
const { system, user } = buildJudgePrompt(battle.prompt, digests);
let judgeOutput = '';
try {
judgeOutput = await arenaModelCall({
config,
model: config.DEFAULT_MODEL,
system,
user,
maxTokens: 2_000,
temperature: 0.3,
});
} catch (err) {
log.error({ err: errMsg(err), battleId: battle.id }, 'arena-analyzer: judge call failed');
judgeOutput = '*(Judge call failed — no comparison produced.)*';
}
const winner = shouldNameWinner(digests.length) ? extractWinner(judgeOutput) : null;
const sections: string[] = [
`# Arena Analysis`,
`\n**Battle type:** ${battle.battle_type}`,
];
if (failedNotes.length > 0) {
sections.push('\n## Failed Contestants\n');
sections.push(...failedNotes);
}
if (digests.length > 0) {
sections.push('\n## Contestant Digests\n');
for (const d of digests) {
sections.push(`### ${d.identity} / ${d.model}`);
sections.push(`*Benchmark: ${d.benchmarkLine}*\n`);
sections.push(d.digest);
}
}
sections.push("\n## Judge's Verdict\n");
sections.push(judgeOutput);
if (winner) {
sections.push(`\n## Winner\n**${winner.identity} / ${winner.model}**`);
} else {
const reason =
digests.length < 2
? 'fewer than 2 contestants produced results'
: 'no clear winner identified';
sections.push(`\n## Winner\n*No winner named (${reason}).*`);
}
return { analysisText: sections.join('\n'), winner };
}
// ─── DB helpers ───────────────────────────────────────────────────────────
async function loadBattle(battleId: string): Promise<BattleRow | null> {
const [b] = await sql<BattleRow[]>`
SELECT id, project_id, battle_type, prompt, status, results_path, winner_contestant_id
FROM battles WHERE id = ${battleId}
`;
return b ?? null;
}
async function loadContestants(battleId: string): Promise<ContestantRow[]> {
return sql<ContestantRow[]>`
SELECT id, identity, model, lane, status, result_path, duration_ms, tokens_per_sec
FROM contestants WHERE battle_id = ${battleId}
ORDER BY created_at ASC
`;
}
// ─── Misc helpers ─────────────────────────────────────────────────────────
function formatBenchmarkLine(c: ContestantRow): string {
const parts: string[] = [];
if (c.duration_ms !== null) parts.push(`${c.duration_ms}ms`);
if (c.tokens_per_sec !== null) parts.push(`${c.tokens_per_sec.toFixed(1)} tok/s`);
return parts.length > 0 ? parts.join(', ') : 'no benchmark';
}
function publishUser(frame: Record<string, unknown>): void {
broker.publishUserFrame('default', frame as unknown as WsFrame);
}
function sleep(ms: number): Promise<void> {
return new Promise((resolve) => setTimeout(resolve, ms));
}
return { analyze, crossExamine };
}
function errMsg(e: unknown): string {
return e instanceof Error ? e.message : String(e);
}

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/**
* Pure scheduling and classification decisions for the Arena battle-runner.
* No database, no IO. Mirrors the pattern of flow-runner-decisions.ts.
*
* Vocabulary:
* local lane — llama-swap-backed contestants, run strictly one at a time
* cloud lane — cloud-backed contestants, run all in parallel
*
* A contestant's status lifecycle:
* queued → running → done | error
*/
import type { BattleType, ContestantLane } from '@boocode/contracts/arena';
// ─── Lane classification ──────────────────────────────────────────────────────
/**
* Classify a contestant into a lane.
*
* Q&A contestants always run on the native (llama-swap) backend → local.
* Coding contestants: their MODEL is checked against the localModels set
* (all model IDs served by the local llama-swap server). This means an
* opencode or qwen contestant pointed at a local model counts as local,
* which correctly captures GPU-contention and fair benchmarking (ADR 0001).
*
* @param battleType 'coding' | 'qa'
* @param identity backend name (coding) or persona name (qa) — not used for lane logic
* @param model the contestant's model id
* @param localModels set of model IDs served by the local llama-swap server
*/
export function classifyLane(
battleType: BattleType,
_identity: string,
model: string,
localModels: ReadonlySet<string>,
): ContestantLane {
if (battleType === 'qa') return 'local';
return localModels.has(model) ? 'local' : 'cloud';
}
// ─── Local-lane queue ─────────────────────────────────────────────────────────
export interface ContestantSlot {
id: string;
lane: ContestantLane;
status: string;
}
/**
* The next queued local contestant to dispatch — the first 'queued' contestant
* in the local lane, in creation order (caller must supply rows in created_at ASC).
* Returns null when the local queue is empty or all local slots are non-queued.
*/
export function nextLocalContestant(contestants: readonly ContestantSlot[]): string | null {
for (const c of contestants) {
if (c.lane === 'local' && c.status === 'queued') return c.id;
}
return null;
}
// ─── Battle completion ────────────────────────────────────────────────────────
/**
* True when every contestant has reached a terminal state (done | error).
* Returns false for an empty list — a battle with no contestants never completes.
*/
export function isBattleComplete(contestants: readonly { status: string }[]): boolean {
if (contestants.length === 0) return false;
return contestants.every((c) => c.status === 'done' || c.status === 'error');
}
// ─── Benchmark ────────────────────────────────────────────────────────────────
export interface Benchmark {
durationMs: number;
tokensPerSec: number | null;
}
/**
* Compute the benchmark for a contestant.
* Wall-clock duration is captured for every contestant; tokens/sec is only
* meaningful for local (llama-swap) contestants where the model has sole
* access to the GPU and the measurement is fair.
*/
export function computeBenchmark(
startedAt: Date,
endedAt: Date,
costTokens: number | null,
lane: ContestantLane,
): Benchmark {
const durationMs = Math.max(0, endedAt.getTime() - startedAt.getTime());
const tokensPerSec =
lane === 'local' && costTokens !== null && durationMs > 0
? (costTokens / durationMs) * 1000
: null;
return { durationMs, tokensPerSec };
}
// ─── Slug / path helpers ──────────────────────────────────────────────────────
/**
* Sanitize a string for use as a directory name component.
* Lowercases, replaces non-alphanumeric runs with '-', trims leading/trailing
* dashes, and caps at 64 characters.
*/
export function sanitizeSlug(s: string): string {
return s
.toLowerCase()
.replace(/[^a-z0-9]+/g, '-')
.replace(/^-+|-+$/g, '')
.slice(0, 64);
}
/**
* Build the dated battle slug used as the Arena results folder name.
* Format: YYYY-MM-DD-<battleType>-<first-8-hex-of-uuid>
* Deterministic: callers can rebuild it from (id, type, created_at) on resume.
*/
export function buildBattleSlug(battleId: string, battleType: BattleType, createdAt: Date): string {
const date = createdAt.toISOString().slice(0, 10);
const shortId = battleId.replace(/-/g, '').slice(0, 8);
return `${date}-${battleType}-${shortId}`;
}
/**
* Build the per-contestant results directory name within a battle folder.
* Format: <sanitized-identity>-<sanitized-model>
*/
export function buildContestantDir(identity: string, model: string): string {
return `${sanitizeSlug(identity)}-${sanitizeSlug(model)}`;
}
// ─── Resume reconciliation ────────────────────────────────────────────────────
export type ContestantResumeAction =
| 'keep'
| 're-dispatch'
| 'mark-done'
| 'mark-error'
| 'mark-cancelled';
export interface ContestantResumeDecision {
contestantId: string;
action: ContestantResumeAction;
}
/**
* Decide what to do with ONE contestant during startup resume.
* Mirrors reconcileResumeStep from flow-runner-decisions.ts.
*
* @param status contestants.status
* @param taskId contestants.task_id (null when not yet dispatched)
* @param taskState tasks.state for taskId, or null if the task row is absent
*/
export function reconcileContestantResume(
status: string,
taskId: string | null,
taskState: string | null,
): ContestantResumeAction {
if (status !== 'running') return 'keep';
if (!taskId || taskState === null) return 're-dispatch';
switch (taskState) {
case 'completed': return 'mark-done';
case 'failed': return 'mark-error';
case 'cancelled': return 'mark-cancelled';
case 'pending': return 'keep'; // dispatcher startup poll will run it normally
default: return 're-dispatch'; // 'running'/'blocked' — process is dead
}
}
/**
* Reconcile every contestant of an in-flight battle for startup resume.
* Returns one decision per contestant. Pure — no IO.
*/
export function reconcileContestants(
contestants: ReadonlyArray<{ contestantId: string; taskId: string | null; status: string }>,
taskStates: ReadonlyMap<string, string>,
): ContestantResumeDecision[] {
return contestants.map((c) => ({
contestantId: c.contestantId,
action: reconcileContestantResume(
c.status,
c.taskId,
c.taskId ? (taskStates.get(c.taskId) ?? null) : null,
),
}));
}

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/**
* One-shot model completion for the Arena analyzer.
*
* Calls the local llama-swap server directly for a single non-streaming
* completion. Used for the digest and judge stages (always DEFAULT_MODEL)
* and for local-model cross-examinations (any local model).
*
* Mirrors apps/server/src/services/task-model.ts but targets the coder's
* config shape and uses a longer timeout appropriate for analysis calls.
*/
import type { Config } from '../config.js';
const TIMEOUT_MS = 120_000;
export async function arenaModelCall(opts: {
config: Pick<Config, 'LLAMA_SWAP_URL'>;
model: string;
system: string;
user: string;
maxTokens?: number;
temperature?: number;
}): Promise<string> {
const { config, model, system, user } = opts;
const maxTokens = opts.maxTokens ?? 2_000;
const temperature = opts.temperature ?? 0.3;
const res = await fetch(`${config.LLAMA_SWAP_URL}/v1/chat/completions`, {
method: 'POST',
headers: { 'Content-Type': 'application/json' },
body: JSON.stringify({
model,
messages: [
{ role: 'system', content: system },
{ role: 'user', content: user },
],
max_tokens: maxTokens,
temperature,
stream: false,
chat_template_kwargs: { enable_thinking: false },
}),
signal: AbortSignal.timeout(TIMEOUT_MS),
});
if (!res.ok) {
const text = await res.text().catch(() => '');
throw new Error(`llama-swap responded ${res.status}: ${text.slice(0, 200)}`);
}
const data = (await res.json()) as {
choices?: Array<{
message?: { content?: string; reasoning_content?: string };
}>;
};
const choice = data.choices?.[0]?.message;
if (!choice) return '';
const content = (choice.content ?? '').trim();
if (content.length > 0) return content;
// For thinking-mode models the answer sometimes only lands in reasoning_content.
const reasoning = (choice.reasoning_content ?? '').trim();
if (reasoning.length > 0) {
const lines = reasoning.split('\n').filter((l) => l.trim().length > 0);
return lines[lines.length - 1] ?? '';
}
return '';
}

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/**
* Arena battle-runner — DB-backed execution engine for Arena battles.
*
* Mirrors flow-runner.ts but implements the Arena's two-lane scheduler instead
* of the Orchestrator's wave scheduler. Persists to battles/contestants tables
* (not flow_runs/flow_steps). Each contestant is dispatched as a real tasks row
* via an injected DispatchContestantFn (Phase 4 wires this to the dispatcher).
* Advances on the dispatcher's onTaskTerminal hook.
*
* Scheduling:
* - Cloud lane: all contestants start immediately, in parallel.
* - Local lane: contestants run strictly one at a time (serial queue). Only
* the first local contestant runs at start; the next is dispatched when the
* current one terminates. Both lanes run concurrently with each other.
*
* Results:
* Written to <projectRoot>/Arena/<battleSlug>/<identity>-<model>/
* Coding: result.md + diff.patch (from the contestant's worktree).
* Q&A: result.md with the text answer.
*
* Analyzer seam:
* onBattleComplete is called when all contestants are terminal. Phase 5 wires
* this to the two-stage digest→judge analyzer. A failed contestant does NOT
* abort the battle — others continue and the analyzer judges survivors.
*/
import type { Sql } from '../db.js';
import type { Broker } from '@boocode/server/broker';
import type { WsFrame } from '@boocode/contracts/ws-frames';
import type { FastifyBaseLogger } from 'fastify';
import type { BattleType, ContestantLane } from '@boocode/contracts/arena';
import { mkdir, writeFile } from 'node:fs/promises';
import { join } from 'node:path';
import { diffWorktree } from './worktrees.js';
import {
buildBattleSlug,
buildContestantDir,
classifyLane,
computeBenchmark,
isBattleComplete,
nextLocalContestant,
reconcileContestants,
type ContestantResumeAction,
type ContestantSlot,
} from './arena-decisions.js';
// ─── Public types ─────────────────────────────────────────────────────────────
export interface ContestantSpec {
/** Backend name (coding) or persona name (qa). */
identity: string;
model: string;
}
export interface BattleStartOpts {
projectId: string;
battleType: BattleType;
prompt: string;
/** 26 contestants. Duplicate (identity, model) pairs are rejected by the schema UNIQUE constraint. */
contestants: ContestantSpec[];
}
/**
* Injected dispatch function — Phase 4 wires this to the real task inserter.
* Must INSERT a tasks row and return its id. The arena-runner sets the
* contestant's task_id and status after this call.
* `sessionId` is returned when already known (Q&A pre-creates the session);
* null for coding contestants whose session is created lazily by the dispatcher.
*/
export type DispatchContestantFn = (opts: {
projectId: string;
contestantId: string;
prompt: string;
identity: string;
model: string;
battleType: BattleType;
}) => Promise<{ taskId: string; sessionId: string | null }>;
/**
* Called once when every contestant in a battle has reached a terminal state.
* Phase 5 wires this to the two-stage digest→judge analyzer.
* Must never throw — the caller swallows errors.
*/
export type OnBattleComplete = (battleId: string) => void;
/**
* Called after a cross_examinations row has been inserted, with its id.
* Phase 5 wires this to the analyzer's cross-examination runner.
* Must never throw — the caller swallows errors.
*/
export type OnCrossExamStart = (opts: {
battleId: string;
crossExamId: string;
identity: string;
model: string;
}) => void;
export interface BattleRunner {
/** Start a battle: persist it + its contestants, classify lanes, dispatch initial wave. */
startBattle(opts: BattleStartOpts): Promise<{ battleId: string }>;
/**
* Wire to createDispatcher({ onTaskTerminal }). Fires when ANY task settles;
* the runner ignores tasks it doesn't own. Never throws.
*/
handleTaskTerminal(taskId: string, state: string): void;
/**
* Re-advance any battles still marked 'running' after a coder restart.
* Mirrors flow-runner's initResume (D-9). Never throws.
*/
initResume(): Promise<void>;
/**
* Cancel a running battle. Marks it and all non-terminal contestants cancelled,
* publishes frames, and returns the task_ids of in-flight contestants so the
* route can abort them via the dispatcher's cancelExternalTask.
*/
cancelBattle(battleId: string): Promise<{ cancelled: boolean; taskIds: string[] }>;
/**
* Trigger analysis for a completed (or manually re-analyzed) battle.
* Phase 5 wires this to the two-stage digest→judge analyzer. For now, calls
* the injected onBattleComplete seam directly.
*/
triggerAnalysis(battleId: string): Promise<{ triggered: boolean }>;
/**
* Start a cross-examination on a battle. Inserts a cross_examinations row and
* invokes the analyzer seam. Phase 5 fills the actual verdict logic.
*/
startCrossExam(
battleId: string,
opts: { identity: string; model: string },
): Promise<{ crossExamId: string }>;
/**
* Manually set (or clear) the winner. Validates the contestant belongs to the
* battle, updates battles.winner_contestant_id, and publishes a battle_updated
* frame so the pane reflects the override immediately.
*/
setWinner(battleId: string, winnerId: string | null): Promise<{
ok: boolean;
notFound?: boolean;
invalidContestant?: boolean;
}>;
}
// ─── Internal row shapes ──────────────────────────────────────────────────────
interface ContestantRow {
id: string;
battle_id: string;
identity: string;
model: string;
lane: ContestantLane;
task_id: string | null;
worktree_id: string | null;
status: string;
}
interface BattleRow {
id: string;
project_id: string;
battle_type: BattleType;
prompt: string;
status: string;
results_path: string | null;
created_at: Date;
}
// ─── Deps / factory ───────────────────────────────────────────────────────────
interface Deps {
sql: Sql;
broker: Broker;
log: FastifyBaseLogger;
dispatch: DispatchContestantFn;
onBattleComplete: OnBattleComplete;
/**
* Called after a cross_examinations row is inserted. Phase 5 wires this to
* the analyzer's cross-examination runner. Optional: absent → no cross-exam
* logic runs (stub behaviour for tests).
*/
onCrossExamStart?: OnCrossExamStart;
/**
* Model IDs served by the local llama-swap server. Used for lane classification:
* a contestant whose model is in this set runs in the local lane (serial, GPU-fair).
* Q&A contestants are always local regardless of this set.
* Defaults to an empty set → all coding contestants go to the cloud lane.
*/
localModels?: ReadonlySet<string>;
}
const DEFAULT_LOCAL_MODELS: ReadonlySet<string> = new Set();
export function createBattleRunner(deps: Deps): BattleRunner {
const { sql, broker, log, dispatch, onBattleComplete, onCrossExamStart } = deps;
const localModels = deps.localModels ?? DEFAULT_LOCAL_MODELS;
// Serialize local-lane advance per battle so two near-simultaneous terminal
// callbacks don't double-dispatch the next local contestant.
const advanceChain = new Map<string, Promise<void>>();
// Delta bridge: per-contestant broker unsubscribe functions.
// 'terminated' sentinel prevents a late-arriving setupDeltaBridge from
// registering a subscription that would never be cleaned up.
const deltaUnsubs = new Map<string, (() => void) | 'terminated'>();
function publishUser(frame: Record<string, unknown>): void {
broker.publishUserFrame('default', frame as unknown as WsFrame);
}
/**
* Subscribe to the contestant's inference session and forward delta frames
* to the user channel as contestant_updated{delta}. Polls for session_id
* when not immediately known (coding contestants whose session is created
* lazily by the dispatcher). Unsubscribes on termination or max retries.
*/
async function setupDeltaBridge(
battleId: string,
contestantId: string,
taskId: string,
knownSessionId: string | null,
): Promise<void> {
let sessionId = knownSessionId;
if (!sessionId) {
// Coding contestant: session_id is written by the dispatcher just before
// inference starts. Poll until it appears or the contestant terminates.
for (let i = 0; i < 50; i++) {
if (deltaUnsubs.get(contestantId) === 'terminated') return;
const [row] = await sql<{ session_id: string | null }[]>`
SELECT session_id FROM tasks WHERE id = ${taskId}
`.catch(() => []);
if (row?.session_id) { sessionId = row.session_id; break; }
await new Promise((r) => setTimeout(r, 200));
}
}
if (!sessionId) return;
if (deltaUnsubs.get(contestantId) === 'terminated') return;
const unsub = broker.subscribe(sessionId, (frame) => {
if (frame.type === 'delta') {
const deltaContent = (frame as unknown as { content?: unknown }).content;
if (typeof deltaContent === 'string') {
publishUser({
type: 'contestant_updated',
battle_id: battleId,
contestant_id: contestantId,
delta: deltaContent,
});
}
}
});
const existing = deltaUnsubs.get(contestantId);
if (existing === 'terminated') {
unsub();
} else {
deltaUnsubs.set(contestantId, unsub);
}
}
function teardownDeltaBridge(contestantId: string): void {
const entry = deltaUnsubs.get(contestantId);
if (typeof entry === 'function') {
entry();
deltaUnsubs.delete(contestantId);
} else {
deltaUnsubs.set(contestantId, 'terminated');
}
}
// ─── startBattle ────────────────────────────────────────────────────────────
async function startBattle(opts: BattleStartOpts): Promise<{ battleId: string }> {
if (opts.contestants.length < 2 || opts.contestants.length > 6) {
throw new Error(`battle requires 26 contestants; got ${opts.contestants.length}`);
}
const [proj] = await sql<{ path: string }[]>`SELECT path FROM projects WHERE id = ${opts.projectId}`;
if (!proj) throw new Error(`project not found: ${opts.projectId}`);
// Insert the battle row as 'running'; update results_path once we have the id.
const [battle] = await sql<{ id: string; created_at: Date }[]>`
INSERT INTO battles (project_id, battle_type, prompt, status)
VALUES (${opts.projectId}, ${opts.battleType}, ${opts.prompt}, 'running')
RETURNING id, created_at
`;
const battleId = battle!.id;
const battleSlug = buildBattleSlug(battleId, opts.battleType, battle!.created_at);
const resultsPath = join(proj.path, 'Arena', battleSlug);
await sql`
UPDATE battles SET results_path = ${resultsPath}, updated_at = clock_timestamp()
WHERE id = ${battleId}
`;
// Insert all contestant rows with lane classification.
const contestantRows: Array<{ id: string; identity: string; model: string; lane: ContestantLane }> = [];
for (const spec of opts.contestants) {
const lane = classifyLane(opts.battleType, spec.identity, spec.model, localModels);
const [row] = await sql<{ id: string }[]>`
INSERT INTO contestants (battle_id, identity, model, lane, status)
VALUES (${battleId}, ${spec.identity}, ${spec.model}, ${lane}, 'queued')
RETURNING id
`;
contestantRows.push({ id: row!.id, identity: spec.identity, model: spec.model, lane });
}
// Write initial manifest so the results folder is always populated.
await writeManifest(
battleId, resultsPath, opts.battleType, opts.prompt, battle!.created_at,
contestantRows.map((c) => ({ identity: c.identity, model: c.model, lane: c.lane })),
null,
).catch((err) => {
log.warn({ err: errMsg(err), battleId }, 'arena-runner: initial manifest write failed');
});
publishUser({
type: 'battle_started',
battle_id: battleId,
battle_type: opts.battleType,
prompt: opts.prompt,
contestants: contestantRows.map((c) => ({
id: c.id,
identity: c.identity,
model: c.model,
lane: c.lane,
})),
});
// Dispatch: cloud lane starts all contestants in parallel; local lane starts
// only the first queued contestant (serial queue).
let localStarted = false;
for (const c of contestantRows) {
if (c.lane === 'cloud') {
await dispatchContestant(battleId, opts.projectId, opts.battleType, opts.prompt, c);
} else if (!localStarted) {
await dispatchContestant(battleId, opts.projectId, opts.battleType, opts.prompt, c);
localStarted = true;
// remaining local contestants stay 'queued' until this one finishes
}
}
return { battleId };
}
async function dispatchContestant(
battleId: string,
projectId: string,
battleType: BattleType,
prompt: string,
c: { id: string; identity: string; model: string; lane: ContestantLane },
): Promise<void> {
const { taskId, sessionId } = await dispatch({
projectId,
contestantId: c.id,
prompt,
identity: c.identity,
model: c.model,
battleType,
});
await sql`
UPDATE contestants
SET task_id = ${taskId}, status = 'running', updated_at = clock_timestamp()
WHERE id = ${c.id}
`;
publishContestantFrame(battleId, c.id, { status: 'running' });
// Start the delta bridge in the background; unsubscribe when the contestant
// terminates (teardownDeltaBridge called in handleTaskTerminal).
void setupDeltaBridge(battleId, c.id, taskId, sessionId ?? null);
}
// ─── local-lane advance (serialized per battle) ───────────────────────────
function advanceLocalLane(battleId: string): Promise<void> {
const prev = advanceChain.get(battleId) ?? Promise.resolve();
const next = prev
.catch(() => {})
.then(() =>
advanceLocalLaneInner(battleId).catch((err) => {
log.error({ err: errMsg(err), battleId }, 'arena-runner: advanceLocalLane failed');
}),
);
advanceChain.set(battleId, next);
void next.finally(() => {
if (advanceChain.get(battleId) === next) advanceChain.delete(battleId);
});
return next;
}
async function advanceLocalLaneInner(battleId: string): Promise<void> {
const battle = await loadBattle(battleId);
if (!battle || battle.status !== 'running') return;
const contestants = await loadContestants(battleId);
const slots: ContestantSlot[] = contestants.map((c) => ({
id: c.id,
lane: c.lane,
status: c.status,
}));
// Nothing to do if the local lane is still busy.
const localRunning = slots.some((c) => c.lane === 'local' && c.status === 'running');
if (localRunning) return;
const nextId = nextLocalContestant(slots);
if (!nextId) return; // local queue is exhausted
const next = contestants.find((c) => c.id === nextId)!;
await dispatchContestant(battleId, battle.project_id, battle.battle_type, battle.prompt, {
id: next.id,
identity: next.identity,
model: next.model,
lane: next.lane,
});
}
// ─── handleTaskTerminal ───────────────────────────────────────────────────
function handleTaskTerminal(taskId: string, state: string): void {
void (async () => {
// Look up which contestant owns this task (contestants_task_id_idx).
const [row] = await sql<ContestantRow[]>`
SELECT id, battle_id, identity, model, lane, task_id, worktree_id, status
FROM contestants WHERE task_id = ${taskId}
`;
if (!row) return; // not an arena task — ignore
if (row.status !== 'running') return; // already settled (idempotent)
const battle = await loadBattle(row.battle_id);
// Pull the task row for benchmark + output.
const [task] = await sql<{
chat_id: string | null;
started_at: Date | null;
ended_at: Date | null;
cost_tokens: number | null;
}[]>`SELECT chat_id, started_at, ended_at, cost_tokens FROM tasks WHERE id = ${taskId}`;
const endedAt = task?.ended_at ?? new Date();
if (state === 'completed') {
const startedAt = task?.started_at ?? endedAt;
const bench = computeBenchmark(startedAt, endedAt, task?.cost_tokens ?? null, row.lane);
const output = task?.chat_id ? await readChatOutput(task.chat_id) : '';
const resultPath = battle
? await writeContestantResults(battle, row, output, bench).catch((err) => {
log.warn({ err: errMsg(err), contestantId: row.id }, 'arena-runner: result write failed');
return null;
})
: null;
await sql`
UPDATE contestants
SET status = 'done',
duration_ms = ${Math.round(bench.durationMs)},
tokens_per_sec = ${bench.tokensPerSec},
cost_tokens = ${task?.cost_tokens ?? null},
result_path = ${resultPath},
updated_at = clock_timestamp()
WHERE id = ${row.id} AND status = 'running'
`;
teardownDeltaBridge(row.id);
// Check if this was the last contestant.
const allContestants = await loadContestants(row.battle_id);
const battleDone = isBattleComplete(allContestants);
publishContestantFrame(row.battle_id, row.id, {
status: 'done',
duration_ms: Math.round(bench.durationMs),
...(bench.tokensPerSec !== null ? { tokens_per_sec: bench.tokensPerSec } : {}),
...(battleDone ? { battle_status: 'completed' } : {}),
});
if (battleDone) {
await completeBattle(row.battle_id);
} else if (row.lane === 'local') {
void advanceLocalLane(row.battle_id);
}
} else {
// failed or cancelled — the contest continues; this contestant is error.
const errorMsg = state === 'cancelled' ? 'cancelled' : `task ${state}`;
await sql`
UPDATE contestants
SET status = 'error', error = ${errorMsg}, updated_at = clock_timestamp()
WHERE id = ${row.id} AND status = 'running'
`;
teardownDeltaBridge(row.id);
const allContestants = await loadContestants(row.battle_id);
const battleDone = isBattleComplete(allContestants);
publishContestantFrame(row.battle_id, row.id, {
status: 'error',
error: errorMsg,
...(battleDone ? { battle_status: 'completed' } : {}),
});
if (battleDone) {
await completeBattle(row.battle_id);
} else if (row.lane === 'local') {
void advanceLocalLane(row.battle_id);
}
}
})().catch((err) => {
log.error({ err: errMsg(err), taskId }, 'arena-runner: handleTaskTerminal failed');
});
}
// ─── battle finalization ──────────────────────────────────────────────────
async function completeBattle(battleId: string): Promise<void> {
const updated = await sql`
UPDATE battles SET status = 'completed', updated_at = clock_timestamp()
WHERE id = ${battleId} AND status = 'running'
`;
if (updated.count === 0) return; // already terminal (race guard)
log.info({ battleId }, 'arena-runner: battle completed');
// Update manifest with finished_at timestamp.
const completedBattle = await loadBattle(battleId);
if (completedBattle?.results_path) {
const contestants = await loadContestants(battleId);
await writeManifest(
battleId,
completedBattle.results_path,
completedBattle.battle_type,
completedBattle.prompt,
completedBattle.created_at,
contestants.map((c) => ({ identity: c.identity, model: c.model, lane: c.lane })),
new Date(),
).catch((err) => {
log.warn({ err: errMsg(err), battleId }, 'arena-runner: manifest update failed');
});
}
onBattleComplete(battleId);
}
// ─── manifest writer ─────────────────────────────────────────────────────
async function writeManifest(
battleId: string,
resultsPath: string,
battleType: BattleType,
prompt: string,
createdAt: Date,
contestants: Array<{ identity: string; model: string; lane: ContestantLane }>,
finishedAt: Date | null,
): Promise<void> {
await mkdir(resultsPath, { recursive: true });
const manifest = {
id: battleId,
battle_type: battleType,
prompt,
contestants,
created_at: createdAt.toISOString(),
finished_at: finishedAt?.toISOString() ?? null,
};
await writeFile(join(resultsPath, 'manifest.json'), JSON.stringify(manifest, null, 2), 'utf8');
}
// ─── results writer ───────────────────────────────────────────────────────
async function writeContestantResults(
battle: BattleRow,
contestant: { identity: string; model: string; lane: ContestantLane; worktree_id: string | null },
output: string,
bench: { durationMs: number; tokensPerSec: number | null },
): Promise<string> {
const resultsPath = await getOrBuildResultsPath(battle);
if (!resultsPath) throw new Error('cannot resolve results path for battle ' + battle.id);
const contestantDir = buildContestantDir(contestant.identity, contestant.model);
const dir = join(resultsPath, contestantDir);
await mkdir(dir, { recursive: true });
const benchLines = [
`duration: ${bench.durationMs}ms`,
bench.tokensPerSec != null ? `tokens/sec: ${bench.tokensPerSec.toFixed(1)}` : null,
]
.filter(Boolean)
.join('\n');
const resultMd =
`# ${contestant.identity} / ${contestant.model}\n\n` +
`## Benchmark\n\n${benchLines}\n\n` +
`## Output\n\n${output}\n`;
await writeFile(join(dir, 'result.md'), resultMd, 'utf8');
if (battle.battle_type === 'coding' && contestant.worktree_id) {
const [wt] = await sql<{ path: string; base_commit: string | null }[]>`
SELECT path, base_commit FROM worktrees WHERE id = ${contestant.worktree_id}
`;
if (wt) {
const [proj] = await sql<{ path: string }[]>`
SELECT path FROM projects WHERE id = ${battle.project_id}
`;
if (proj) {
const diff = await diffWorktree(wt.path, proj.path, {
baseRef: wt.base_commit ?? undefined,
}).catch(() => '');
await writeFile(join(dir, 'diff.patch'), diff, 'utf8');
}
}
}
return dir;
}
/** Resolve or rebuild results_path for a battle (handles crash-before-UPDATE). */
async function getOrBuildResultsPath(battle: BattleRow): Promise<string | null> {
if (battle.results_path) return battle.results_path;
const [proj] = await sql<{ path: string }[]>`SELECT path FROM projects WHERE id = ${battle.project_id}`;
if (!proj) return null;
const slug = buildBattleSlug(battle.id, battle.battle_type, battle.created_at);
const resultsPath = join(proj.path, 'Arena', slug);
await sql`
UPDATE battles SET results_path = ${resultsPath}, updated_at = clock_timestamp()
WHERE id = ${battle.id}
`;
return resultsPath;
}
// ─── helpers ──────────────────────────────────────────────────────────────
async function readChatOutput(chatId: string): Promise<string> {
const [m] = await sql<{ content: string | null }[]>`
SELECT content FROM messages
WHERE chat_id = ${chatId} AND role = 'assistant'
ORDER BY created_at DESC LIMIT 1
`;
return m?.content ?? '';
}
async function loadBattle(battleId: string): Promise<BattleRow | null> {
const [b] = await sql<BattleRow[]>`
SELECT id, project_id, battle_type, prompt, status, results_path, created_at
FROM battles WHERE id = ${battleId}
`;
return b ?? null;
}
async function loadContestants(battleId: string): Promise<ContestantRow[]> {
return sql<ContestantRow[]>`
SELECT id, battle_id, identity, model, lane, task_id, worktree_id, status
FROM contestants WHERE battle_id = ${battleId}
ORDER BY created_at ASC
`;
}
function publishContestantFrame(
battleId: string,
contestantId: string,
extra: Record<string, unknown>,
): void {
publishUser({
type: 'contestant_updated',
battle_id: battleId,
contestant_id: contestantId,
...extra,
});
}
// ─── initResume ───────────────────────────────────────────────────────────
async function initResume(): Promise<void> {
const battles = await sql<BattleRow[]>`
SELECT id, project_id, battle_type, prompt, status, results_path, created_at
FROM battles WHERE status = 'running'
`;
if (battles.length === 0) return;
log.info({ count: battles.length }, 'arena-runner: resuming in-flight battles on startup');
for (const battle of battles) {
await resumeBattle(battle).catch((err) => {
log.error({ err: errMsg(err), battleId: battle.id }, 'arena-runner: initResume failed for battle');
});
}
}
async function resumeBattle(battle: BattleRow): Promise<void> {
const contestants = await loadContestants(battle.id);
const taskIds = contestants.map((c) => c.task_id).filter((id): id is string => id !== null);
const taskStates = new Map<string, string>();
if (taskIds.length > 0) {
const tasks = await sql<{ id: string; state: string }[]>`
SELECT id, state FROM tasks WHERE id = ANY(${taskIds})
`;
for (const t of tasks) taskStates.set(t.id, t.state);
}
const decisions = reconcileContestants(
contestants.map((c) => ({ contestantId: c.id, taskId: c.task_id, status: c.status })),
taskStates,
);
for (const decision of decisions) {
if (decision.action === 'keep') continue;
const contestant = contestants.find((c) => c.id === decision.contestantId)!;
await applyResumeDecision(battle, contestant, decision.action);
}
// Re-check completion after applying decisions.
const updated = await loadContestants(battle.id);
if (isBattleComplete(updated)) {
await completeBattle(battle.id);
} else {
// Advance local lane in case a slot opened up.
void advanceLocalLane(battle.id);
}
log.info({ battleId: battle.id }, 'arena-runner: battle resumed');
}
async function applyResumeDecision(
battle: BattleRow,
contestant: ContestantRow,
action: ContestantResumeAction,
): Promise<void> {
switch (action) {
case 'keep': break;
case 'mark-done': {
const taskRow = contestant.task_id
? (await sql<{ started_at: Date | null; ended_at: Date | null; cost_tokens: number | null; chat_id: string | null }[]>`
SELECT started_at, ended_at, cost_tokens, chat_id FROM tasks WHERE id = ${contestant.task_id}`)[0]
: null;
const endedAt = taskRow?.ended_at ?? new Date();
const startedAt = taskRow?.started_at ?? endedAt;
const bench = computeBenchmark(startedAt, endedAt, taskRow?.cost_tokens ?? null, contestant.lane);
const output = taskRow?.chat_id ? await readChatOutput(taskRow.chat_id) : '';
const resultPath = battle
? await writeContestantResults(battle, contestant, output, bench).catch((err) => {
log.warn({ err: errMsg(err), contestantId: contestant.id }, 'arena-runner: resume result write failed');
return null;
})
: null;
await sql`
UPDATE contestants
SET status = 'done',
duration_ms = ${Math.round(bench.durationMs)},
tokens_per_sec = ${bench.tokensPerSec},
result_path = ${resultPath},
updated_at = clock_timestamp()
WHERE id = ${contestant.id}
`;
break;
}
case 'mark-error':
await sql`
UPDATE contestants
SET status = 'error', error = 'task failed before callback',
updated_at = clock_timestamp()
WHERE id = ${contestant.id}
`;
break;
case 'mark-cancelled':
await sql`
UPDATE contestants
SET status = 'error', error = 'cancelled before callback',
updated_at = clock_timestamp()
WHERE id = ${contestant.id}
`;
break;
case 're-dispatch': {
const { taskId } = await dispatch({
projectId: battle.project_id,
contestantId: contestant.id,
prompt: battle.prompt,
identity: contestant.identity,
model: contestant.model,
battleType: battle.battle_type,
});
await sql`
UPDATE contestants
SET task_id = ${taskId}, updated_at = clock_timestamp()
WHERE id = ${contestant.id}
`;
log.info(
{ battleId: battle.id, contestantId: contestant.id, taskId },
'arena-runner: contestant re-dispatched on resume',
);
break;
}
}
}
// ─── cancelBattle ─────────────────────────────────────────────────────────
async function cancelBattle(battleId: string): Promise<{ cancelled: boolean; taskIds: string[] }> {
const updated = await sql`
UPDATE battles SET status = 'cancelled', updated_at = clock_timestamp()
WHERE id = ${battleId} AND status = 'running'
`;
if (updated.count === 0) return { cancelled: false, taskIds: [] };
// Mark all non-terminal contestants cancelled and collect in-flight task_ids.
const contestants = await sql<{ id: string; task_id: string | null; status: string }[]>`
SELECT id, task_id, status FROM contestants
WHERE battle_id = ${battleId} AND status NOT IN ('done', 'error')
`;
if (contestants.length > 0) {
await sql`
UPDATE contestants
SET status = 'error', error = 'battle cancelled', updated_at = clock_timestamp()
WHERE battle_id = ${battleId} AND status NOT IN ('done', 'error')
`;
for (const c of contestants) {
publishContestantFrame(battleId, c.id, {
status: 'error',
error: 'battle cancelled',
battle_status: 'cancelled',
});
}
}
const taskIds = contestants
.filter(
(c): c is typeof c & { task_id: string } =>
c.task_id !== null && c.status === 'running',
)
.map((c) => c.task_id);
log.info({ battleId }, 'arena-runner: battle cancelled by request');
return { cancelled: true, taskIds };
}
// ─── triggerAnalysis (Phase 5 seam) ──────────────────────────────────────
async function triggerAnalysis(battleId: string): Promise<{ triggered: boolean }> {
const battle = await loadBattle(battleId);
if (!battle) return { triggered: false };
log.info({ battleId }, 'arena-runner: triggerAnalysis requested');
// Calls the injected onBattleComplete seam — Phase 5 replaces this with the
// real two-stage digest→judge analyzer (see ADR 0002 + plan Phase 5).
onBattleComplete(battleId);
return { triggered: true };
}
// ─── startCrossExam (Phase 5 seam) ───────────────────────────────────────
async function startCrossExam(
battleId: string,
opts: { identity: string; model: string },
): Promise<{ crossExamId: string }> {
const [row] = await sql<{ id: string }[]>`
INSERT INTO cross_examinations (battle_id, identity, model)
VALUES (${battleId}, ${opts.identity}, ${opts.model})
RETURNING id
`;
const crossExamId = row!.id;
log.info({ battleId, crossExamId, ...opts }, 'arena-runner: cross-exam inserted, triggering analyzer');
if (onCrossExamStart) {
try {
onCrossExamStart({ battleId, crossExamId, identity: opts.identity, model: opts.model });
} catch (err) {
log.error({ err: err instanceof Error ? err.message : String(err), battleId, crossExamId }, 'arena-runner: onCrossExamStart threw');
}
}
return { crossExamId };
}
// ─── setWinner (user override) ────────────────────────────────────────────
async function setWinner(
battleId: string,
winnerId: string | null,
): Promise<{ ok: boolean; notFound?: boolean; invalidContestant?: boolean }> {
const [row] = await sql<{ id: string }[]>`SELECT id FROM battles WHERE id = ${battleId}`;
if (!row) return { ok: false, notFound: true };
if (winnerId !== null) {
const [c] = await sql<{ id: string }[]>`
SELECT id FROM contestants WHERE id = ${winnerId} AND battle_id = ${battleId}
`;
if (!c) return { ok: false, invalidContestant: true };
}
await sql`
UPDATE battles SET winner_contestant_id = ${winnerId}, updated_at = clock_timestamp()
WHERE id = ${battleId}
`;
publishUser({ type: 'battle_updated', battle_id: battleId, winner_contestant_id: winnerId });
return { ok: true };
}
return { startBattle, handleTaskTerminal, initResume, cancelBattle, triggerAnalysis, startCrossExam, setWinner };
}
function errMsg(e: unknown): string {
return e instanceof Error ? e.message : String(e);
}

View File

@@ -310,6 +310,9 @@ export function createDispatcher(deps: Deps): {
const taskId = task.id;
log.info({ taskId }, 'dispatcher: starting task (path A — native)');
// Declared before try so the catch block can write it back on the task row.
let chatId: string | null = null;
try {
// Mark running
await sql`
@@ -318,26 +321,29 @@ export function createDispatcher(deps: Deps): {
WHERE id = ${taskId}
`;
// Create session + chat for this task
// Session setup: reuse a pre-created session (e.g. Q&A arena contestants
// whose persona is stamped on the session via agent_id) or create a fresh one.
const model = task.model ?? config.DEFAULT_MODEL;
const sessionName = 'Task: ' + task.input.slice(0, 40);
const [session] = await sql<{ id: string }[]>`
INSERT INTO sessions (project_id, name, model, status)
VALUES (${task.project_id}, ${sessionName}, ${model}, 'open')
RETURNING id
`;
const sessionId = session!.id;
let sessionId: string;
if (task.session_id) {
sessionId = task.session_id;
} else {
const sessionName = 'Task: ' + task.input.slice(0, 40);
const [session] = await sql<{ id: string }[]>`
INSERT INTO sessions (project_id, name, model, status)
VALUES (${task.project_id}, ${sessionName}, ${model}, 'open')
RETURNING id
`;
sessionId = session!.id;
await sql`UPDATE tasks SET session_id = ${sessionId} WHERE id = ${taskId}`;
}
const [chat] = await sql<{ id: string }[]>`
INSERT INTO chats (session_id, name, status)
VALUES (${sessionId}, 'Task execution', 'open')
RETURNING id
`;
const chatId = chat!.id;
// Link task to session
await sql`UPDATE tasks SET session_id = ${sessionId} WHERE id = ${taskId}`;
chatId = chat!.id;
// Create user message + streaming assistant
await sql<{ id: string }[]>`
@@ -382,7 +388,7 @@ export function createDispatcher(deps: Deps): {
const summary = (msg?.content ?? '').slice(0, 500);
await sql`
UPDATE tasks
SET state = 'completed', ended_at = clock_timestamp(), output_summary = ${summary}, cost_tokens = ${costTokens}
SET state = 'completed', ended_at = clock_timestamp(), output_summary = ${summary}, cost_tokens = ${costTokens}, chat_id = ${chatId}
WHERE id = ${taskId}
`;
log.info({ taskId, costTokens }, 'dispatcher: task completed (native)');
@@ -409,7 +415,7 @@ export function createDispatcher(deps: Deps): {
const summary = (msg?.content ?? 'Inference failed').slice(0, 500);
await sql`
UPDATE tasks
SET state = 'failed', ended_at = clock_timestamp(), output_summary = ${summary}, cost_tokens = ${costTokens}
SET state = 'failed', ended_at = clock_timestamp(), output_summary = ${summary}, cost_tokens = ${costTokens}, chat_id = ${chatId}
WHERE id = ${taskId}
`;
log.warn({ taskId, finalStatus }, 'dispatcher: task failed (native)');
@@ -419,7 +425,7 @@ export function createDispatcher(deps: Deps): {
log.error({ taskId, err: errMsg }, 'dispatcher: task error (native)');
await sql`
UPDATE tasks
SET state = 'failed', ended_at = clock_timestamp(), output_summary = ${errMsg.slice(0, 500)}
SET state = 'failed', ended_at = clock_timestamp(), output_summary = ${errMsg.slice(0, 500)}, chat_id = ${chatId}
WHERE id = ${taskId}
`.catch(() => {});
}