self-customize
Customize your own agent — add capabilities, install packages, add MCP servers, edit code or CLAUDE.md. Use when the user asks you to add a feature, install a tool, or modify how you work. For non-trivial code changes, delegate to a builder agent via create_agent.
npx skills add majiayu000/claude-skill-registry --skill self-customize --agent claude-code
Same command for any agent — swap --agent for codex, cursor, copilot.
Weekly change comes from our own snapshots, not the repository page — it measures attention, not adoption.
# Self-Customization You can modify your own environment. Different kinds of changes have different workflows. ## Decision Tree **What needs to change?** - **`CLAUDE.local.md` or files in your workspace** → Edit directly, no approval needed. Your workspace (`/workspace/agent/`) is persisted on the host. (Note: the composed `CLAUDE.md` itself is read-only and regenerated every spawn — write to `CLAUDE.local.md` instead.) - **System package (apt) or global npm package** → `install_packages`. Requires admin approval. On approval, image rebuild + container restart happen automatically. - **MCP server** → `add_mcp_server`. Requires admin approval. On approval, container restarts with the new server wired up (no rebuild — bun runs TS directly). - **Your source code or Dockerfile** → Delegate to a builder agent via `create_agent` (see below). - **A new specialist capability** → `create_agent` to spin up a dedicated agent for it. ## Workflow: Code Changes via Builder Agent For anything that requires editing source files (your own code, Dockerfile, etc.), **do not edit directly** — delegate to a builder agent. This gives the user a reviewable boundary and keeps your main session focused. 1.
- Decision Tree
- Workflow: Code Changes via Builder Agent
- Builder Agent Instructions (use as CLAUDE.md when creating)
- Diff Size Limits — Why
- Example: Adding a New MCP Tool to Yourself
- Example: Installing a System Tool
- When NOT to Self-Customize
What does the self-customize skill do?
Customize your own agent — add capabilities, install packages, add MCP servers, edit code or CLAUDE.md. Use when the user asks you to add a feature, install a tool, or modify how you work. For non-trivial code changes, delegate to a builder agent via create_agent.
How do I install it?
Run `npx skills add majiayu000/claude-skill-registry --skill self-customize --agent claude-code` — it drops the skill into your project so the agent can pick it up. Swap the --agent value for codex, cursor or copilot if you use one of those.
Where does this skill come from?
From majiayu000/claude-skill-registry, a repository with 534 stars. We read it straight from the repository tree rather than a submitted listing, so what you see here is what is actually published.
Is a popular skill a good skill?
Not necessarily. Stars measure attention, not adoption — a repository can trend for a week and be abandoned. That is why we show the weekly change from our own snapshots next to the total, instead of a single flattering number.