claude-engineering-plugin/AGENTS.md

Agent Instructions

This repository primarily houses the compound-engineering coding-agent plugin and the Claude Code marketplace/catalog metadata used to distribute it.

It also contains:

• the Bun/TypeScript CLI that converts Claude Code plugins into other agent platform formats
• additional plugins under plugins/, such as coding-tutor
• shared release and metadata infrastructure for the CLI, marketplace, and plugins

AGENTS.md is the canonical repo instruction file. Root CLAUDE.md exists only as a compatibility shim for tools and conversions that still look for it.

Quick Start

bun install
bun test                  # full test suite
bun run release:validate  # check plugin/marketplace consistency

Working Agreement

• Branching: Create a feature branch for any non-trivial change. If already on the correct branch for the task, keep using it; do not create additional branches or worktrees unless explicitly requested.
• Safety: Do not delete or overwrite user data. Avoid destructive commands.
• Testing: Run bun test after changes that affect parsing, conversion, or output.
• Release versioning: Releases are prepared by release automation, not normal feature PRs. The repo now has multiple release components (cli, compound-engineering, coding-tutor, marketplace). GitHub release PRs and GitHub Releases are the canonical release-notes surface for new releases; root CHANGELOG.md is only a pointer to that history. Use conventional titles such as feat: and fix: so release automation can classify change intent, but do not hand-bump release-owned versions or hand-author release notes in routine PRs.
• Linked versions (cli + compound-engineering): The linked-versions release-please plugin keeps cli and compound-engineering at the same version. This is intentional -- it simplifies version tracking across the CLI and the plugin it ships. A consequence is that a release with only plugin changes will still bump the CLI version (and vice versa). The CLI changelog may also include commits that exclude-paths would normally filter, because linked-versions overrides exclusion logic when forcing a synced bump. This is a known upstream release-please limitation, not a misconfiguration. Do not flag linked-version bumps as unnecessary.
• Output Paths: Keep OpenCode output at opencode.json and .opencode/{agents,skills,plugins}. For OpenCode, command go to ~/.config/opencode/commands/<name>.md; opencode.json is deep-merged (never overwritten wholesale).
• Scratch Space: Default to OS temp. Use .context/ only when explicitly justified by the rules below.
  • Default: OS temp — covers most scratch, including per-run throwaway AND cross-invocation reusable, regardless of whether a repo is present or whether other skills may read the files. A stable OS-temp prefix handles cross-skill and cross-invocation coordination equally well as an in-repo path; repo-adjacency is rarely the relevant property.
    • Per-run throwaway: mktemp -d -t <prefix>-XXXXXX (OS handles cleanup). Use for files consumed once and discarded — captured screenshots, stitched GIFs, intermediate build outputs, recordings, delegation prompts/results, single-run checkpoints.
    • Cross-invocation reusable: stable path like "${TMPDIR:-/tmp}/compound-engineering/<skill-name>/<run-id>/" — not mktemp -d — so later invocations of the same skill can discover sibling run-ids. Use for caches keyed by session, checkpoints meant to survive context compaction within a loose session, or any state where later runs of the same skill need to locate prior outputs.
  • Exception: .context/ — use only when the artifact is genuinely bound to the CWD repo AND meets at least one of:
    • (a) User-curated: the user is expected to inspect, manipulate, or manually curate the artifact outside the skill (e.g., a per-repo TODO database, a per-spec optimization log that survives across sessions on the same checkout).
    • (b) Repo+branch-inseparable: the artifact's meaning is inseparable from this specific repo or branch (e.g., branch-specific resume state that a user expects to pick up again in the same checkout).
    • (c) Path is core UX: surfacing the artifact path back to the user is a core part of the skill's output and that path is easier to communicate as a repo-relative location than an OS-temp one. Namespace under .context/compound-engineering/<workflow-or-skill-name>/, add a per-run subdirectory when concurrent runs are plausible, and decide cleanup behavior per the artifact's lifecycle (per-run scratch clears on success; user-curated state persists). "Shared between skills" is not by itself sufficient — OS temp handles that equally well.
  • Durable outputs (plans, specs, learnings, docs, final deliverables) belong in docs/ or another repo-tracked location, not in either scratch tier.
  • Cross-platform note: "${TMPDIR:-/tmp}" is the portable prefix — $TMPDIR resolves on macOS (per-user path in /var/folders/) and may be set on Linux; the /tmp fallback covers unset cases. mktemp -d -t <prefix>-XXXXXX works on macOS, Linux, and WSL. Skills authored here assume Unix-like shells; native Windows is not a current target.
• Character encoding:
  • Identifiers (file names, agent names, command names): ASCII only -- converters and regex patterns depend on it.
  • Markdown tables: Use pipe-delimited (| col | col |), never box-drawing characters.
  • Prose and skill content: Unicode is fine (emoji, punctuation, etc.). Prefer ASCII arrows (->, <-) over Unicode arrows in code blocks and terminal examples.

Directory Layout

src/              CLI entry point, parsers, converters, target writers
plugins/          Plugin workspaces (compound-engineering, coding-tutor)
.claude-plugin/   Claude marketplace catalog metadata
tests/            Converter, writer, and CLI tests + fixtures
docs/             Requirements, plans, solutions, and target specs

Repo Surfaces

Changes in this repo may affect one or more of these surfaces:

• compound-engineering under plugins/compound-engineering/
• the Claude marketplace catalog under .claude-plugin/
• the converter/install CLI in src/ and package.json
• secondary plugins such as plugins/coding-tutor/

Do not assume a repo change is "just CLI" or "just plugin" without checking which surface owns the affected files.

Plugin Maintenance

When changing plugins/compound-engineering/ content:

• Update substantive docs like plugins/compound-engineering/README.md when the plugin behavior, inventory, or usage changes.
• Do not hand-bump release-owned versions in plugin or marketplace manifests.
• Do not hand-add release entries to CHANGELOG.md or treat it as the canonical source for new releases.
• Run bun run release:validate if agents, commands, skills, MCP servers, or release-owned descriptions/counts may have changed.
• When removing a skill, agent, or command, add its name to both cleanup registries so stale flat-install artifacts are swept on upgrade:
  • STALE_SKILL_DIRS / STALE_AGENT_NAMES / STALE_PROMPT_FILES in src/utils/legacy-cleanup.ts
  • EXTRA_LEGACY_ARTIFACTS_BY_PLUGIN["compound-engineering"] in src/data/plugin-legacy-artifacts.ts

Useful validation commands:

bun run release:validate
cat .claude-plugin/marketplace.json | jq .
cat plugins/compound-engineering/.claude-plugin/plugin.json | jq .

Coding Conventions

• Prefer explicit mappings over implicit magic when converting between platforms.
• Keep target-specific behavior in dedicated converters/writers instead of scattering conditionals across unrelated files.
• Preserve stable output paths and merge semantics for installed targets; do not casually change generated file locations.
• When adding or changing a target, update fixtures/tests alongside implementation rather than treating docs or examples as sufficient proof.

Commit Conventions

• Prefix is based on intent, not file type. Use conventional prefixes (feat:, fix:, docs:, refactor:, etc.) but classify by what the change does, not the file extension. Files under plugins/*/skills/, plugins/*/agents/, and .claude-plugin/ are product code even though they are Markdown or JSON. Reserve docs: for files whose sole purpose is documentation (README.md, docs/, CHANGELOG.md).
• Include a component scope. The scope appears verbatim in the changelog. Pick the narrowest useful label: skill/agent name (document-review, learnings-researcher), plugin or CLI area (coding-tutor, cli), or shared area when cross-cutting (review, research, converters). Never use compound-engineering — it's the entire plugin and tells the reader nothing. Omit scope only when no single label adds clarity.
• Breaking changes must be explicit with ! or a breaking-change footer so release automation can classify them correctly.

Adding a New Target Provider

Only add a provider when the target format is stable, documented, and has a clear mapping for tools/permissions/hooks. Use this checklist:

1. Define the target entry

   • Add a new handler in src/targets/index.ts with implemented: false until complete.
   • Use a dedicated writer module (e.g., src/targets/codex.ts).

2. Define types and mapping

   • Add provider-specific types under src/types/.
   • Implement conversion logic in src/converters/ (from Claude → provider).
   • Keep mappings explicit: tools, permissions, hooks/events, model naming.

3. Wire the CLI

   • Ensure convert and install support --to <provider> and --also.
   • Keep behavior consistent with OpenCode (write to a clean provider root).

4. Tests (required)

   • Extend fixtures in tests/fixtures/sample-plugin.
   • Add spec coverage for mappings in tests/converter.test.ts.
   • Add a writer test for the new provider output tree.
   • Add a CLI test for the provider (similar to tests/cli.test.ts).

5. Docs

   • Update README with the new --to option and output locations.

Agent References in Skills

When referencing agents from within skill SKILL.md files (e.g., via the Agent or Task tool), use the bare ce-<agent-name> form. The ce- prefix identifies the agent as a compound-engineering component and is sufficient for uniqueness across plugins.

Example:

• ce-learnings-researcher (correct)
• learnings-researcher (wrong — the ce- prefix is required; it's what prevents collisions with agents from other plugins that might share a short name)

File References in Skills

Each skill directory is a self-contained unit. A SKILL.md file must only reference files within its own directory tree (e.g., references/, assets/, scripts/) using relative paths from the skill root. Never reference files outside the skill directory — whether by relative traversal or absolute path.

Broken patterns:

• ../other-skill/references/schema.yaml — relative traversal into a sibling skill
• /home/user/plugins/compound-engineering/skills/other-skill/file.md — absolute path to another skill
• ~/.claude/plugins/cache/marketplace/compound-engineering/1.0.0/skills/other-skill/file.md — absolute path to an installed plugin location

Why this matters:

• Runtime resolution: Skills execute from the user's working directory, not the skill directory. Cross-directory paths and absolute paths will not resolve as expected.
• Unpredictable install paths: Plugins installed from the marketplace are cached at versioned paths. Absolute paths that worked in the source repo will not match the installed layout, and the version segment changes on every release.
• Converter portability: The CLI copies each skill directory as an isolated unit when converting to other agent platforms. Cross-directory references break because sibling directories are not included in the copy.

If two skills need the same supporting file, duplicate it into each skill's directory. Prefer small, self-contained reference files over shared dependencies.

Note (March 2026): This constraint reflects current Claude Code skill resolution behavior and known path-resolution bugs (#11011, #17741, #12541). If Anthropic introduces a shared-files mechanism or cross-skill imports in the future, this guidance should be revisited with supporting documentation.

Platform-Specific Variables in Skills

This plugin is authored once and converted for multiple agent platforms (Claude Code, Codex, Gemini CLI, etc.). Do not use platform-specific environment variables or string substitutions (e.g., ${CLAUDE_PLUGIN_ROOT}, ${CLAUDE_SKILL_DIR}, ${CLAUDE_SESSION_ID}, CODEX_SANDBOX, CODEX_SESSION_ID) in skill content without a graceful fallback that works when the variable is unavailable or unresolved.

Preferred approach — relative paths: Reference co-located scripts and files using relative paths from the skill directory (e.g., bash scripts/my-script.sh ARG). All major platforms resolve these relative to the skill's directory. No variable prefix needed.

When a platform variable is unavoidable: Use the pre-resolution pattern (! backtick syntax) and include explicit fallback instructions in the skill content, so the agent knows what to do if the value is empty, literal, or an error:

**Plugin version (pre-resolved):** !`jq -r .version "${CLAUDE_PLUGIN_ROOT}/.claude-plugin/plugin.json"`

If the line above resolved to a semantic version (e.g., `2.42.0`), use it.
Otherwise (empty, a literal command string, or an error), use the versionless fallback.
Do not attempt to resolve the version at runtime.

This applies equally to any platform's variables — a skill converted from Codex, Gemini, or any other platform will have the same problem if it assumes platform-only variables exist without a fallback.

Repository Docs Convention

• Requirements live in docs/brainstorms/ — requirements exploration and ideation.
• Plans live in docs/plans/ — implementation plans and progress tracking.
• Solutions live in docs/solutions/ — documented decisions and patterns.
• Specs live in docs/specs/ — target platform format specifications.

Solution categories (docs/solutions/)

This repo builds a plugin for developers. Categorize solutions from the perspective of the end user (a developer using the plugin), not a contributor to this repo.

• developer-experience/ — Issues with contributing to this repo: local dev setup, shell aliases, test ergonomics, CI friction. If the fix only matters to someone with a checkout of this repo, it belongs here.
• integrations/ — Issues where plugin output doesn't work correctly on a target platform or OS. Cross-platform bugs, target writer output problems, and converter compatibility issues go here.
• workflow/, skill-design/ — Plugin skill and agent design patterns, workflow improvements.

When in doubt: if the bug affects someone running bun install compound-engineering or bun convert, it's an integration or product issue, not developer-experience.