Detect available systems with read-only checks (command -v plus existing target files). Do not infer that every detected system should be modified.
Ask the user which of Claude Code, Codex, Copilot CLI, and Cursor to configure. This selection is required before any user-home write.
Read references/platform-paths.md for the selected systems. Resolve documented home overrides before default paths.
Choose the instruction content:
- use assets/global-instructions.md for the project defaults;
- use a user-supplied file with --template when requested;
- never silently copy a repository's project-specific instructions into user scope.
Run scripts/install_user_instructions.py --systems <csv> without --apply. This is the mandatory dry-run and diff preview.
Show every destination and diff. For Cursor, show the copy/paste block for Cursor Settings > Rules; do not invent a filesystem destination.
Ask for confirmation of the exact selected destinations and changes.
After confirmation, rerun with --apply. Writing outside the workspace may require the runtime's normal filesystem approval.
Verify each selected system using the command or UI check in references/platform-paths.md.
Audit the current repository for duplicated general rules. Report exact duplicates or conflicts, but remove project content only with separate user approval.

Non-destructive contract

Manage only the block between  and .
Preserve all content outside the managed block byte-for-byte.
Fail on unmatched or repeated markers instead of guessing.
Default to preview mode. --apply is required for writes.
Write only explicitly selected systems.
Keep Cursor manual until its official User Rules surface exposes a stable, supported file path.
Keep general personal defaults at user scope. Repository AGENTS.md, CLAUDE.md, .github/copilot-instructions.md, and .cursor/rules contain only project facts or system-specific/path-scoped deltas.
Do not duplicate shared project rules in CLAUDE.md; import AGENTS.md and append Claude-only deltas.

Script examples

Preview Claude, Codex, and Copilot targets:

uv run python scripts/install_user_instructions.py \
  --systems claude,codex,copilot

Apply the approved preview:

uv run python scripts/install_user_instructions.py \
  --systems claude,codex,copilot --apply

Preview Cursor's manual User Rules block:

uv run python scripts/install_user_instructions.py --systems cursor

Use absolute paths to the skill script when the current working directory is not this skill directory.

Content policy

The bundled defaults encode the central agent-fanout routing contract: strongest-tier lead judgment, intermediate approved-plan elaboration, and worker-tier implementation with explicit tests and gates. They also require closing/removing completed one-off agents.

Use semantic line breaks in prose source generally. GitHub issue and pull-request bodies are the exception: keep each paragraph on one source line, separate paragraphs with blank lines, and do not insert sentence- or clause-level newlines inside a paragraph.

install-user-instructions

Install User Instructions

Workflow