Bug: ac22-write-set-criterion-unsatisfiable #885

• Work Mode: full-bug

Summary

The "AC22 Write Set" acceptance-criterion pattern requires an agent-executed change's footprint to match a spec's declared Write Set exactly. Every agent-executed delivery in this repository also writes tracked .claude/agent-memory/ files that no spec's Write Set enumerates in advance, so a criterion phrased this way fails on every delivery regardless of whether the substantive requirement (no untouched production or test file modified) was met. This is a defect in the criterion template wording, not in the work it judges.

Environment

• OS/version: Windows 11 Pro 10.0.26200
• Python version: not applicable; this concerns the atomic-plan/spec acceptance-criterion template used for C# and cross-language feature work
• Command/flags used: n/a (documentation/process defect); observed via git -C <item-871-worktree> diff --name-only <merge-base>..HEAD type footprint review during feature-audit
• Data source or fixture: docs/features/active/2026-09-11-qfcqueue-enqueue-path-lacks-injectable-seams-871/spec.md (AC22), pull request fix(#871): add injectable seams to the QfcQueue enqueue path #883

Steps to Reproduce

1. Open item 871's spec.md AC22 and its pull request fix(#871): add injectable seams to the QfcQueue enqueue path #883 (fix(#871): add injectable seams to the QfcQueue enqueue path).
2. Read PR fix(#871): add injectable seams to the QfcQueue enqueue path #883's "Follow-ups" section, which states verbatim: "Acceptance criterion AC22 is the one criterion not met as literally worded, and is left unchecked. Its substantive requirement holds: no untouched production or test file was modified. It fails only because the branch carries three tracked agent-memory files that the declared Write Set does not enumerate."
3. Confirm .claude/agent-memory/ is a tracked directory in this repository (verified: dozens of files under it are tracked and modified across active sessions, including four .md files touched in this same session).
4. Observe that every agent that executes a plan writes to its configured agent-memory root during the run, so this same AC22-style criterion will recur on the next delivery, and the one after that, independent of which agent or which feature is involved.

Expected Behavior

An AC22-style "Write Set" criterion should be satisfiable by a correctly-scoped, agent-executed change. Either the criterion should carry an explicit repository-wide carve-out for .claude/agent-memory/** writes (since these are infrastructure bookkeeping, not production or test changes), or the Write Set declaration mechanism should be extended to auto-include the agent-memory paths that any executing agent is expected to touch.

Actual Behavior

The criterion as currently worded is unsatisfiable in principle by any agent-executed change, because:

• .claude/agent-memory/ is tracked in git.
• Every agent (orchestrator, atomic-executor, feature-review, etc.) writes lesson/memory files to it during normal operation.
• No spec's Write Set, authored before execution, can enumerate agent-memory files that do not yet exist at authoring time.
• The failure therefore recurs on every item, not just item 871, and cannot be fixed by tightening any individual plan's scope.

This shares a root cause with a related, separately-observed problem: some agents' configured agent-memory root resolves into a worktree their own directives forbid them to write to, which produced four disclosed directive breaches in one run (reported separately; not itself the subject of this issue, but the underlying agent-memory-path/worktree-resolution mechanism is the same one implicated here).

Logs / Screenshots

• Attached minimal logs or screenshot
• Snippet: PR fix(#871): add injectable seams to the QfcQueue enqueue path #883 body, "Follow-ups" section, final bullet: "Acceptance criterion AC22 is the one criterion not met as literally worded, and is left unchecked. Its substantive requirement holds: no untouched production or test file was modified. It fails only because the branch carries three tracked agent-memory files that the declared Write Set does not enumerate. The remedy is a one-line documentation amendment, not a code change." (verified by reading gh pr view 883 on 2026-09-13)

Impact / Severity

• Blocker
• Medium
• Low

Medium: the underlying implementation work was verified sound (no untouched production/test file modified), so no delivered change is actually defective. The cost is a recurring, unfixable-per-item AC failure that will misreport delivered work as incomplete on every future item until the template wording changes.

Source

From: docs/features/potential/2026-09-13-ac22-write-set-criterion-unsatisfiable.md