# Claude Code Hooks vs MCP: Setup, Examples and Security

A setup-oriented guide for combining Claude Code hooks, skills, and MCP servers without creating brittle automation.

## Quick Answer

Use Claude Code hooks for deterministic lifecycle events, skills for reusable procedures, and MCP for external tools or data. Hooks answer when something should run, skills answer how Claude should perform a recurring task, and MCP answers what outside system Claude can safely reach.

## Best for

Developers and platform teams wiring Claude Code into repo-specific workflows.

## Use this guide to

Advanced Claude Code users want to connect hooks and MCP safely and understand where each control belongs.

## Recommended play

1. Start with the control map before installing anything: hooks for deterministic events, MCP for external capability, skills for reusable process.
2. Ship the first workflow read-only, then add write access only after the benefit is proven and the failure mode is documented.
3. Connect every hook and MCP server to a visible owner, rollback path, and audit trail.

## Hooks, MCP, and skills control map

Use this map to keep automation understandable as Claude Code workflows become more powerful.

| Area | Use for | Good examples | Risk to control |
| --- | --- | --- | --- |
| Hooks | Deterministic lifecycle actions | Format before completion, notify after task, run a local check | Unexpected side effects or slow workflows |
| MCP | Structured access to external tools and data | Browser, GitHub, database, docs, monitoring systems | Over-broad permissions and secret exposure |
| Skills | Reusable procedural knowledge | incident review workflow, code review workflow, release checklist | Outdated references or overly broad instructions |
| Manual approval | Destructive or production-facing changes | Deployments, data deletion, billing changes | Accidental write operations |
| Logs | Troubleshooting and audit trail | Hook trigger, MCP method, target, outcome, approval state | Secret leakage and noisy records nobody reviews |

## Execution steps

1. **Write the workflow boundary** — Describe which action should happen automatically, which action needs a tool, and which action must stay human-approved.
2. **Install read-only first** — Add MCP servers and hooks with the smallest useful permission set so failures are observable without being destructive.
3. **Document failure behavior** — For each hook and MCP tool, write what happens when it times out, fails, returns empty data, or lacks credentials.
4. **Promote after proof** — Only widen permissions after the workflow has completed successfully on a small project and the owner agrees with the logs.
5. **Add a troubleshooting note** — Record the expected working directory, required binaries, credentials, timeout behavior, and rollback command before teammates copy the setup.

## Common pitfalls

- **Using MCP for deterministic local steps**: Prefer hooks for repeatable lifecycle actions and reserve MCP for external systems or structured tool access.
- **Adding write access too early**: Keep the first rollout read-only and graduate one capability at a time.
- **No rollback path**: Document how to disable each hook or server before it becomes part of team workflow.

## Implementation checklist

- [ ] List every hook and MCP server by purpose.
- [ ] Mark read-only versus write-capable access.
- [ ] Document credentials and environment gates.
- [ ] Add a rollback path for failing hooks.
- [ ] Test the workflow on a small repo before broad rollout.

## FAQ

**Q: When should you use Claude Code hooks instead of MCP?**

Use hooks for deterministic lifecycle events such as formatting, validation, or notifications. Use MCP when Claude needs structured access to an external tool, database, browser, repository, or internal system. Do not use MCP when a hook can run the deterministic local command.

**Q: Why are Claude Code hooks not working?**

Common causes are stale credentials, missing local binaries, slow hooks, incorrect working directories, over-broad MCP permissions, and unclear failure behavior. Log hook name, trigger, command, exit code, duration, and whether the hook blocked the task before widening permissions.

**Q: How should you roll out hooks and MCP safely?**

Start read-only, test hooks locally, document expected side effects, and add write capabilities only after the workflow proves useful and the owner agrees with the logs.

## Evidence sources

- [Claude Code hooks](https://docs.anthropic.com/en/docs/claude-code/hooks) — Anthropic. Official hook behavior reference.
- [Claude Code MCP](https://docs.anthropic.com/en/docs/claude-code/mcp) — Anthropic. Official MCP setup reference for Claude Code.
- [Model Context Protocol](https://modelcontextprotocol.io/) — MCP. Protocol reference for MCP servers and clients.

## Related guides

- [MCP server not showing tools troubleshooting guide](/guides/mcp-server-not-showing-tools) — Use the diagnostic fault tree when a configured Claude Code MCP server is missing tools or exposes zero tools.
- [repository instruction file comparison](/guides/agents-md-vs-claude-md-cursorrules-copilot-instructions) — Decide what belongs in CLAUDE.md before moving repeatable actions into hooks or MCP tools.
- [secure MCP servers](/guides/secure-mcp-servers-ai-coding-agents) — Any setup guide that enables MCP needs a deeper security checklist before production use.
- [Claude Code subagents workflow examples](/guides/claude-code-subagents-examples) — Hooks and MCP become more useful when paired with clear delegation patterns.
- [loop engineering for AI coding agents](/guides/loop-engineering-ai-coding-agents) — Hooks and MCP supply the observe-and-act cycles that make agent loops repeatable and stoppable.

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Canonical: https://www.kyenai.com/guides/claude-code-hooks-mcp-setup