MC Quality Trail — validator_agent + agent_output write semantics (Patch #10036)

Summary Patch bundle MC #10036 (landed 2026-04-29) backfills two missing quality-trail columns in Mission Control. Prior to this patch, 0 of 6,529 tasks had validator_agent populated, making audit and quality trending impossible. The patch adds --validator <slug> and --quality <int> flags to mc.js ready , and makes mc.js done write the task outcome to agent_output when that column is NULL. All writes use no-clobber semantics so existing data is never overwritten. Validated by Proveo (MC #10038, 8/8 PASS, GLOBAL_VERDICT: PASS). New CLI flags — mc.js ready Flag Type Validation Effect --validator <slug> string regex [a-z][a-z0-9_-]{1,40} Writes validator_agent + validation_timestamp = datetime('now') --quality <int> integer 0–10 inclusive Writes quality_score No-clobber semantics Both flags are strictly optional. If a flag is absent or empty the corresponding column is not touched — existing values are preserved. This applies to both commands: mc.js ready: if --validator is omitted, validator_agent and validation_timestamp remain unchanged. If --quality is omitted, quality_score remains unchanged. mc.js done: the outcome string is written to agent_output only when agent_output IS NULL . If the column already has a value the done-outcome is preserved in task_history only and a log line confirms: [mc.js done] agent_output already set — outcome preserved in history only . Postflight derivation — GLOBAL_VERDICT to quality score The task-postflight skill (SKILL.md Section 6) derives the --quality integer from the GLOBAL_VERDICT emitted by the validator agent: GLOBAL_VERDICT --quality value PASS 10 PARTIAL 5 FAIL 0 Example invocation node ~/system/tools/mc.js ready 9999 "validation passed" --validator proveo --quality 10 This single command marks the task ready, records the validator identity, timestamps the validation, and writes the quality score in one atomic call. Audit query To find tasks closed after the patch date that are still missing a validator (quality trail gap): SELECT id, title, status, completed_at FROM tasks
WHERE status='done' AND validator_agent IS NULL AND completed_at > '2026-04-29'; Cross-references MC #10036 — master patch task (implementation) MC #10038 — Proveo validation subtask (8/8 PASS, GLOBAL_VERDICT: PASS) MC #10039 — this documentation subtask (Skillforge) task-postflight SKILL.md Section 6 — /Users/makinja/.claude/skills/task-postflight/SKILL.md lines 251–320 — canonical derivation table and flag usage examples