Project Context

• CLAUDE.md: !find . -maxdepth 1 -name "CLAUDE.md" -type f
• project-discovery.md: !find . -maxdepth 3 -name "project-discovery.md" -type f

Review Approach

• Read the full plan before challenging — an assumption that looks wrong in isolation may make sense in context.
• Ground challenges in codebase evidence: "The API handler at src/api/handler.go:47 returns XML, not JSON" is actionable; "This assumes the API returns JSON" is not.
• Check overlap against existing code, not just the plan — the most valuable overlap findings are external utilities or patterns the codebase already has.
• Ask practical ambiguity questions — "Should this handle concurrent access?" is only useful if there's evidence concurrent access actually happens.
• YAGNI is a first-class review pillar. Apply the evidence-based YAGNI rule from ../../references/yagni-rule.md to every plan item the review touches — every behavior, plan step, abstraction, configuration knob, runbook, observability hook, infrastructure component, test category, ADR clause, or coding-standard line. Items that fail the evidence test or have a strictly simpler version available are first-class findings (Category: YAGNI candidate), not polish. Resolution paths: cite missing evidence and keep, replace with simpler version, or move to the plan's ## Deferred (YAGNI) section with the reopening trigger named. YAGNI candidates are surfaced visibly to the user — never silently dropped, never silently kept. Every plan item is ongoing maintenance and a pattern future agents will copy.
• Evidence quality is a first-class review pillar. Apply the companion evidence rule from ../../references/evidence-rule.md alongside the YAGNI gate. YAGNI asks whether a plan item has any evidence at all; the evidence rule asks how strong that evidence is. Specifically: name the trust class of each citation a plan item rests on (codebase, web, provided); apply the corroboration gate to web-source claims that drive a recommendation (single-source web claims get marked and cannot stand alone); and label claims with no evidence at any tier as a distinct state rather than treating them as weak evidence. The proximity-to-origin principle is a heuristic, not a strict tier list; do not raise findings purely because a plan item cites docs instead of running code.
• The review lives in three cross-referenced files. The plan file is the primary artifact edited in place and stays at the root of {plan-dir}/; review-findings.md records every finding and how it was resolved, and review-iteration-history.md records each iteration or round — both companion artifacts live in {plan-dir}/artifacts/ to keep the plan folder uncluttered. The plan gets a standardized ## Review History section at the bottom pointing to the companion files. Inline (F#) markers are NOT added to plan sentences — forward traceability lives in the findings file's Changed in plan: field. (Inline ([T#](...)) markers in spec-aware mode remain — they tag load-bearing mechanic-driven spec sentences and are not finding markers.) The findings and iteration files (siblings inside artifacts/) cross-link through Raised in round: / Findings raised: fields and both record Changed in plan: sections. Any edit to one file requires updating the matching fields in the others.

Iterative Plan Review

Step 1: Locate the Plan and Set Up Companion Files

Find the plan file from the user's argument. If no path was provided, use Glob to find ~/.claude/plans/*.md — Glob returns files sorted by modification time, so the first result is the most recent plan. Read the full plan file and understand its structure, scope, and current state before proceeding.

Resolve project config: read CLAUDE.md's ## Project Discovery section for language, framework, docs, ADR, and coding-standards directories; fall back to project-discovery.md; fall back to Glob defaults (docs/, docs/adr/, docs/coding-standards/). This context informs assumption evaluation and overlap checks in later steps.

Spec-aware mode detection

After reading the plan file, determine whether it is a feature-specification.md produced by (or compatible with) han:plan-a-feature. Engage spec-aware mode when either signal holds:

• Primary signal — the plan's filename is exactly feature-specification.md.
• Fallback signal — the file contains the canonical top-level headings of a feature spec: ## Outcome, ## Actors and Triggers, ## Primary Flow, and ## Coordinations (at least three of these four).

When spec-aware mode engages, state one line to the user:

Detected feature specification; applying spec-stage rules to this review. Say "general mode" to override if this file is not a behavioral spec.

This confirmation lets the user correct a misclassification (e.g., the file was renamed, or is a document that happens to share headings but isn't a spec). If the user overrides, drop spec-aware mode for the rest of the session.

When spec-aware mode is engaged, detect whether {plan-dir}/artifacts/feature-technical-notes.md already exists. If it does NOT exist, the file is treated as absent for the duration of this review unless a load-bearing finding causes it to be created lazily. When the file is absent, omit every T#-related sentence from agent briefs, the spec-maturity tag set, and the round entry's Changed in tech-notes: field — do not add boilerplate qualifiers like "if it exists." When the file is present (or once it has been created lazily), restore the T# instructions for the agents from that point forward.

When spec-aware mode is engaged, the following apply across later steps:

• Content rule — the spec must obey plan-a-feature's operating-principles rule: no language primitives, file/line references, function/class names, library mechanics, implementation patterns, or internal flag names in behavioral sentences. Any finding that surfaces a mechanic in the spec is routed per the rule.
• Mechanic routing — a finding that requires a mechanic to explain a behavior is classified as:
  • Load-bearing (affects observable behavior) → extract the mechanic to a new T# entry in {plan-dir}/artifacts/feature-technical-notes.md (creating the file lazily if this is the first qualifying note). Restate the spec sentence behaviorally and add an inline ([T#](artifacts/feature-technical-notes.md#...)) link. Record the write in the F# entry's Changed in tech-notes: field.
  • Discoverable from code repo → restate the spec sentence behaviorally and cite the evidence source on the related D# entry in {plan-dir}/artifacts/decision-log.md (if the spec has a decision log). Do not write a T#.
  • Pure implementation → remove from the spec entirely. Record as an F# with Resolved by: deferred to open item, noting that the mechanic belongs to plan-implementation.
• "mechanics leaking into spec" finding class — specialists (and self-review) tag any behavioral sentence that leaks implementation mechanics as Category: mechanics leaking into spec. Resolution of this class rewrites the offending sentence behaviorally and, when needed, extracts the mechanic per the routing above.

Determine the companion file paths. They live in the artifacts/ subfolder of the plan's directory (create the subfolder when the first companion file is written):

• {plan-dir}/artifacts/review-findings.md
• {plan-dir}/artifacts/review-iteration-history.md
• {plan-dir}/artifacts/feature-technical-notes.md — spec-aware mode only, and lazily created. Written only when the review produces at least one load-bearing T#. Follow the cross-reference invariants in feature-technical-notes-template.md as applied by plan-a-feature.

For legacy reviews produced before the artifacts layout was