Agent-Skills.md

Agent Skills: Agent Instructions Manager

Creates missing instruction files (CLAUDE.md, AGENTS.md, GEMINI.md), audits token budget, prompt cache safety, cross-agent consistency. Use after setup or when instruction files need alignment.

UncategorizedID: levnikolaevich/claude-code-skills/ln-014-agent-instructions-manager

Repository

levnikolaevich/claude-code-skills
levnikolaevichLicense: MIT
29647

Install this agent skill to your local

pnpm dlx add-skill https://github.com/levnikolaevich/claude-code-skills/tree/HEAD/plugins/setup-environment/skills/ln-014-agent-instructions-manager

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plugins/setup-environment/skills/ln-014-agent-instructions-manager/SKILL.md

Skill Metadata

Name
ln-014-agent-instructions-manager
Description
"Creates AGENTS.md canonical and CLAUDE.md @AGENTS.md stub; audits token budget, cache safety, import-pattern compliance. Use when instruction files need alignment."

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 references/coordinator_summary_contract.md, references/environment_worker_runtime_contract.md, and references/worker_runtime_contract.md MANDATORY READ: Load references/mcp_tool_preferences.md MANDATORY READ: Load 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:

  • references/coordinator_summary_contract.md
  • 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 plugins/*/skills/*/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
  1. Score: 2+ signal categories → CONFLICT. 1 → WARN. 0 → safe
  2. CONFLICT: "CONFLICT: {plugin} overlaps with ln-* pipeline ({signals}). Disable?" → AskUserQuestion → if yes, set to false in settings.json
  3. 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 plugins/documentation-pipeline/skills/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 plugins/documentation-pipeline/skills/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 plugins/documentation-pipeline/skills/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 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|March|today|yesterday|Last Updated:)' except **Last Updated:** at file end | WARN | | 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/|/Users/' (machine-specific) | INFO | | 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 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 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