Paths: All file refs relative to skills repo root.

Agent Instructions Manager

Type: L3 Worker Category: 0XX Shared

Creates missing instruction files and audits them (AGENTS.md, CLAUDE.md) for quality, consistency, and best practices. AGENTS.md is the single canonical source of content; CLAUDE.md is a thin @AGENTS.md import stub with bounded harness-specific deltas. This skill is the single owner of instruction-file creation and MCP Tool Preferences insertion or replacement.

MANDATORY READ: Load shared/references/coordinator_summary_contract.md, shared/references/environment_worker_runtime_contract.md, and shared/references/worker_runtime_contract.md MANDATORY READ: Load shared/references/mcp_tool_preferences.md MANDATORY READ: Load shared/references/agent_instructions_writing_guide.md — canonical rationale for the @AGENTS.md import pattern, size budgets, and anti-patterns. All audit checks below trace back to this guide.

Input / Output

Direction	Content
Input	project context, dry_run flag, optional runId, optional summaryArtifactPath
Output	Structured summary envelope with payload.status = completed / skipped / error, plus created files, audit findings, and warnings in changes / detail

If summaryArtifactPath is provided, write the same summary JSON there. If not provided, return the summary inline and remain fully standalone. If runId is not provided, generate a standalone run_id before emitting the summary envelope.

Runtime

Runtime family: environment-worker-runtime

Phase profile:

1. PHASE_0_CONFIG
2. PHASE_1_DISCOVER_FILES
3. PHASE_2_CREATE_MISSING_FILES
4. PHASE_3_TOKEN_BUDGET_AUDIT
5. PHASE_4_PROMPT_CACHE_SAFETY
6. PHASE_5_CONTENT_QUALITY
7. PHASE_6_IMPORT_PATTERN_COMPLIANCE
8. PHASE_7_WRITE_SUMMARY
9. PHASE_8_SELF_CHECK

Runtime rules:

• emit summary_kind=env-instructions
• standalone runs generate their own run_id and write the default worker-family artifact path
• managed runs require both runId and summaryArtifactPath and must write the summary to the exact provided path
• always write the validated summary artifact before terminal outcome

Output Contract

Always build a structured env-instructions summary envelope per:

• shared/references/coordinator_summary_contract.md
• shared/references/environment_worker_runtime_contract.md

Payload fields:

• files_found
• files_created
• quality_findings
• token_budget
• prompt_cache_safety
• import_pattern_status
• status

When to Use

• After editing any instruction file
• After adding/removing MCP servers or hooks
• Before release or publishing
• When sessions degrade (context bloat symptoms)
• First-time project setup (instruction files missing)

Phase 1: Discover Files

Locate instruction files in target project:

Agent	Primary	Canonical source	Fallback
Claude Code	CLAUDE.md	imports AGENTS.md via @AGENTS.md	.claude/settings.local.json
Codex / Cursor / Amp / Factory	AGENTS.md	canonical	.codex/instructions.md

Report: which files exist (found / missing), which harnesses share AGENTS.md directly vs via import.

Phase 1b: Plugin Conflict Check

Skip condition: No enabledPlugins in settings OR all plugins are @levnikolaevich-skills-marketplace.

1. Read ~/.claude/settings.json → parse enabledPlugins
2. Filter: enabled=true AND publisher ≠ levnikolaevich-skills-marketplace
3. For each external plugin:
   • Resolve active install first: matching plugin or marketplace under ~/.claude/plugins/marketplaces/*
   • Read active skills-catalog/*/SKILL.md descriptions from that install surface
   • Only if no active install is available, fall back to the latest cache snapshot under ~/.claude/plugins/cache/{publisher}/{plugin}/*/skills/*/SKILL.md
   • Treat cache as forensic fallback only. Never count multiple cache snapshots as separate active conflicts.
   • Match against conflict signal keywords:

Signal	Keywords in description	Overlap with
Orchestration	"orchestrat", "pipeline", "end-to-end", "lifecycle"	ln-1000 pipeline
Planning	"plan.*implement", "brainstorm", "design.*spec"	ln-300 task coordinator
Execution	"execut.*plan", "subagent.*task", "task-by-task"	ln-400/ln-401 executors
Code review	"code.review.*dispatch", "review.*quality.*spec"	ln-402/ln-310
Quality gate	"quality.*gate", "verification.*complet", "test-driven.*always"	ln-500 quality gate
Debugging	"systematic.*debug", "root.*cause.*phase"	problem_solving.md
Git isolation	"worktree.*creat", "git.*isolat"	git_worktree_fallback.md

• Check for hooks/session-start directory in the active install surface first

4. Score: 2+ signal categories → CONFLICT. 1 → WARN. 0 → safe
5. CONFLICT: "CONFLICT: {plugin} overlaps with ln-* pipeline ({signals}). Disable?" → AskUserQuestion → if yes, set to false in settings.json
6. WARN: report, continue

Phase 2: Create Missing Files

Skip condition: All files exist OR dry_run == true (report what would be created).

Canonical model: AGENTS.md is the single source of content. CLAUDE.md is an @AGENTS.md import stub with bounded harness-specific deltas. Create in this order so the stub references a file that already exists.

Step 2a: Detect Project Context

Field	Source	Fallback
PROJECT_NAME	package.json → name	basename(cwd)
PROJECT_DESCRIPTION	package.json → description	[TBD: Project description]
DATE	current date (YYYY-MM-DD)	—
ENABLE_WORKFLOW_PRINCIPLES	Caller input (default false)	—

Step 2b: Create AGENTS.md (if missing) — canonical

1. MANDATORY READ: Load skills-catalog/ln-111-root-docs-creator/references/templates/agents_md_template.md
2. Replace {{PROJECT_NAME}}, {{PROJECT_DESCRIPTION}}, {{DATE}}, and {{DEV_COMMANDS_*}} placeholders
3. If ENABLE_WORKFLOW_PRINCIPLES=true: replace {{WORKFLOW_PRINCIPLES_BLOCK}} with the full content of skills-catalog/ln-111-root-docs-creator/references/templates/agents_md_workflow_principles.md. Otherwise strip the placeholder line and its leading HTML comment.
4. Mark remaining {{...}} as [TBD: placeholder_name]
5. Write to target project root

Step 2c: Create CLAUDE.md (if missing) — import stub

1. MANDATORY READ: Load skills-catalog/ln-111-root-docs-creator/references/templates/claude_md_template.md
2. Replace {{PROJECT_NAME}} only
3. Write to target project root
4. Verify the file contains exactly one @AGENTS.md line and is ≤50 lines total
5. Do NOT copy any content from AGENTS.md into CLAUDE.md — the @ import handles it at session load time

Step 2e: Report Creations

List each created file with its source (template agents_md_template.md, template claude_md_template.md stub).

Phase 3: Token Budget Audit

Line-count budgets align with the Anthropic official target (<200 lines per CLAUDE.md file) and the IFScale instruction-ceiling research. See shared/references/agent_instructions_writing_guide.md for the full rationale.

Check	Pass	Warn	Fail
AGENTS.md line count	≤150	151-200	>200
CLAUDE.md line count (stub)	≤20	21-50	>50
User-added imperative count in AGENTS.md	≤100	101-150	>150

Imperative counter: lines matching ^\s*- inside rule sections, plus any line containing MUST\|NEVER\|ALWAYS\|DO NOT. Cite the IFScale benchmark (arxiv 2507.11538) in WARN / FAIL messages.

Report table per file with line count and imperative count (for AGENTS.md).

Phase 4: Prompt Cache Safety

Check each file for content that breaks prefix-based prompt caching:

#	Check	Pattern	Severity
1	No timestamps	grep -E '\d{4}-\d{2}-\d{2}.\d{2}:\d{2}'	WARN
2	No dates in content	`grep -E '(January	February
3	No dynamic counts	grep -E '\d+ skills|\d+ tools|\d+ servers' (hardcoded counts change)	WARN
4	No absolute paths	`grep -E '[A-Z]:\	/home/
5	Stable structure	No conditional sections (if X then include Y)	INFO

Phase 5: Content Quality

#	Check	Pass	Fail
1	Has build/test commands	Found npm|cargo|pytest|dotnet commands in AGENTS.md	Missing — add essential commands
2	No abstract principles	No "write quality code", "follow best practices"	Found vague instructions
3	No redundant docs	No API docs, no full architecture description	Found content discoverable from code
4	Has hard boundaries	Found NEVER|ALWAYS|MUST|DO NOT rules in AGENTS.md	Missing explicit prohibitions
5	Compact Instructions section	## Compact Instructions present in AGENTS.md with preservation priorities	Missing — sessions lose decisions on /compact
6	MCP Tool Preferences	Canonical policy section in AGENTS.md matches shared/references/mcp_tool_preferences.md	Missing or outdated — agents use suboptimal tools
7	No tool output examples	No large code blocks or command outputs	Found — bloats every turn

Checks #1–#6 evaluate AGENTS.md only because CLAUDE.md inherits that content via the @AGENTS.md import. Checks on the delta itself live in Phase 6.

Phase 5b: Auto-fix Fixable Issues

For each FAIL in Phase 5, attempt auto-fix before reporting:

Before any auto-fix insertion:

1. Verify insertion point exists (exact heading found at specific line)
2. If ambiguous (heading not found) — WARN and skip (report as manual fix needed)
3. After insertion — verify no duplicate ## Compact Instructions or ## MCP Tool Preferences sections exist in the file

#	Issue	Fix	Skip when
5	Missing Compact Instructions	Insert ## Compact Instructions section before ## Navigation in AGENTS.md	dry_run: true
6	Missing or outdated MCP Tool Preferences	Insert or replace section in AGENTS.md from shared/references/mcp_tool_preferences.md	dry_run: true
1	Missing build/test commands	WARN only (project-specific, cannot auto-generate)	--
2	Abstract principles found	WARN only (requires human judgment)	--

Compact Instructions template (insert in AGENTS.md before ## Navigation or after last rules section):

## Compact Instructions

Preserve during /compact: [Critical Rules], [MCP Tool Preferences table],
[Navigation table], [language/communication rules], [hard boundaries (NEVER/ALWAYS)].
Drop examples and explanations first.

Because CLAUDE.md @AGENTS.md, the preservation list propagates to Claude Code. The harness-specific terminology (/compact vs context compression) lives in the stub delta.

Phase 6: Import Pattern Compliance

AGENTS.md is the canonical source per DOC_ROLE metadata. CLAUDE.md must be a thin @AGENTS.md import stub with bounded harness-specific deltas.

#	Check	Pass	Fail
1	CLAUDE.md has @AGENTS.md import	Exactly one @AGENTS.md line present	Missing or multiple — FAIL
2	CLAUDE.md delta bounded	Total file ≤50 lines	>50 lines — FAIL with drift report
3	No content duplication	No section or rule from AGENTS.md reappears in CLAUDE.md	Duplicate found — FAIL, name the specific overlapping lines

Drift resolution rule: AGENTS.md is the canonical source. For each inconsistency:

• (a) If content is missing from AGENTS.md but present in CLAUDE.md → move it to AGENTS.md, then remove from the stub.
• (b) If CLAUDE.md duplicates AGENTS.md content → replace with a single @AGENTS.md import line.
• (c) If the stub delta exceeds 50 lines → split genuinely harness-specific content into .claude/rules/*.md; everything else moves to AGENTS.md.

Do not "suggest which file is source of truth" based on content volume — AGENTS.md is always the source.

If .hex-skills/environment_state.json reports agents.codex.discovery_violation=true, emit a WARN that Codex skill discovery is drifted and duplicate skill counts from stale cache must not be used as evidence during instruction audits until ln-013-config-syncer repairs the marketplace/plugin alignment.

If .hex-skills/environment_state.json reports agents.codex.permissions_default_ready=false, emit a WARN that Codex CLI startup permissions are drifted from the managed default and instruction audits must not assume full-access startup semantics until ln-013-config-syncer repairs ~/.codex/config.toml.

Phase 7: Report

Agent Instructions Manager:

Created:  (omit section if nothing created)
- AGENTS.md (from template, context from package.json)
- CLAUDE.md (import stub)

Audit:
| File       | Lines | Imperatives | Cache-safe | Quality | Import pattern | Issues |
|------------|-------|-------------|------------|---------|----------------|--------|
| AGENTS.md  | 118   | 47          | OK         | 7/7     | n/a            | OK |
| CLAUDE.md  | 13    | 0           | OK         | 7/7     | OK             | OK |

Import pattern: OK (or N drift issues listed)

Recommendations:
1. Run /init (ln-100) for full context-aware AGENTS.md with project-specific rules

Cross-agent note: Codex CLI 0.120 (2026-04-11) now supports SessionStart hook with /clear vs fresh/resume distinction, matching Claude Code behavior.

Definition of Done

• All instruction files discovered
• Missing files created (AGENTS.md from template first; CLAUDE.md as @AGENTS.md import stub second)
• Token budget within limits: AGENTS.md ≤200 lines, CLAUDE.md ≤50 lines, AGENTS.md imperative count ≤150
• No prompt cache breakers found (or reported as WARN)
• Content quality checks passed on AGENTS.md (or issues reported)
• Auto-fixable issues resolved in AGENTS.md (Compact Instructions, MCP Tool Preferences) or reported if dry_run
• Import pattern compliance verified: CLAUDE.md contains exactly one @AGENTS.md line and no duplicated AGENTS.md content
• Report generated with creation log, drift findings, and actionable recommendations
• No conflicting external plugins detected (or user confirmed keep)
• Structured summary returned
• Summary artifact written to the managed or standalone runtime path

Critical Rule: Non-destructive file edits. Auto-fix inserts sections at verified positions only. Never rewrite the entire instruction file. Preserve all existing content outside the inserted section.

Version: 2.2.0 Last Updated: 2026-03-25