Skill Compass

skill-compass

UserPromptSubmit + PostToolUse hooks for Claude Code. They route to the right skills/agents from three signals: the working directory's composition (languages, frameworks, config files), project/topic keywords in your prompt, and keywords the AI surfaces mid-turn (a Bash/Grep/Glob/Read/Task result). E.g. UI files → frontend-design, API routes → api-design, a Dockerfile → infra, "find the clickhouse migration" → the database skills. It nudges the model toward the right skill instead of relying on memory.

Layout (this repo)

Run paths are relative to the repo root (the parent of skill/):

• compass.js — the hook engine (handles both events). Flags: --self-test, --force, --post (PostToolUse mode). Disable per-session with env SKILL_COMPASS=off.
• directions.json — the routing table: maps detected stacks/files → suggested directions. This is the file users edit.
• install.js — installer. Copies compass.js + directions.json into ~/.claude/skill-compass/ and registers both the UserPromptSubmit and PostToolUse hooks in ~/.claude/settings.json. Idempotent. --uninstall removes both hooks.

After install the live copy runs from ~/.claude/skill-compass/, so edits to the installed directions.json survive re-installs (the installer keeps an existing one).

Tasks

Install / enable the hook

Run from the repo root:

node install.js

It copies files, registers the hook, and prints the test command. Tell the user to restart Claude Code afterward — the hook is loaded at process start. If they re-run it, it's a no-op (idempotent), which is the expected, safe outcome.

Uninstall / disable

• Permanent removal: node install.js --uninstall (strips the hook from settings.json, leaves files in place).
• Temporary, one session: set SKILL_COMPASS=off in the environment before launching Claude Code.

Inspect or edit routing rules

directions.json is the source of truth for what gets suggested. To see current rules, read it. To change behavior, edit it directly. After editing the installed copy at ~/.claude/skill-compass/directions.json, no reinstall is needed — the running hook reads it fresh.

When adding a new stack→direction mapping, match the existing entries' shape (a detector for the stack and the direction text it emits). After any edit, always run the self-test below to confirm nothing broke.

Run the self-test

This is the verification step before claiming any change works:

node compass.js --self-test

It exercises stack detection, direction routing, and the empty-project guard, then prints ALL PASSED (non-zero exit on failure). If a user reports the hook mis-suggesting, reproduce by adding or adjusting a case here first — a failing self-test case localizes the bug before you touch the engine.

Debug "it's not suggesting anything"

Walk these in order:

1. Hooks registered? Check ~/.claude/settings.json → hooks.UserPromptSubmit and hooks.PostToolUse each contain a command with skill-compass (the PostToolUse one ends with --post).
2. Disabled? Check the SKILL_COMPASS env var isn't off.
3. Restarted? Hooks only load at Claude Code startup.
4. Empty/at-root project? With no stack manifest, no prompt keyword and no mid-turn tool finding, the engine intentionally stays silent (junk-drawer guard) — cd into a real project, mention a project/topic keyword, or pass --force.

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: by-sonic
• Source: by-sonic/skill-compass
• License: MIT
• Homepage: https://by-sonic.github.io/skill-compass/

Install and usage instructions live in the source repository linked above.