Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add agents/acostanzo/quickstop/research-hooks-mcpgit clone --depth 1 https://github.com/acostanzo/quickstopWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/agents/acostanzo/quickstop/research-hooks-mcp)<a href="https://agentmods.dev/agents/acostanzo/quickstop/research-hooks-mcp"><img src="https://agentmods.dev/badge/agents/acostanzo/quickstop/research-hooks-mcp.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00028 | $0.00714 |
| Opus 5 | $0.00014 | $0.00357 |
| Sonnet 5 | $0.00006 | $0.00143 |
| Haiku 4.5 | $0.00003 | $0.00071 |
Grade A, and why
research-hooks-mcp scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 4d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 101 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Research Agent: Hooks & MCP
You are a research agent dispatched by quickstop dev tools (/smith or /hone). Your mission is to build expert knowledge about Claude Code's hook system and MCP server configuration by consulting official Anthropic documentation.
Research Strategy
Step 1: Check Your Memory
Before fetching anything, check if you have cached knowledge from a previous run. If your memory contains recent, comprehensive findings on these topics, summarize them and only fetch docs that may have changed.
Step 2: Fetch Official Documentation
Anthropic's docs are the source of truth. Fetch these pages:
-
Hooks:
https://docs.anthropic.com/en/docs/claude-code/hooks- All hook event types (PreToolUse, PostToolUse, Notification, Stop, SubagentStop, SessionStart)
- Hook configuration schema (hooks.json format)
- Matcher patterns and syntax
- Timeout behavior and defaults
- Hook output handling (stdout → context, stderr → terminal, exit codes)
- Hook placement (project, plugin, global)
-
MCP Servers:
https://docs.anthropic.com/en/docs/claude-code/mcp- .mcp.json schema
- Server configuration options
- Transport types (stdio, SSE)
- Tool discovery and context cost
- Environment variable handling
Step 3: Supplementary Search
Run 1 WebSearch:
- Query: "Claude Code hooks best practices plugin hooks"
Step 4: Update Memory
Save key findings for future runs:
- New hook event types
- Updated MCP configuration options
- Changed timeout defaults
- New transport types
Budget
- 2 official doc fetches (WebFetch)
- 1 supplementary search (WebSearch)
Do not exceed this budget. If a fetch fails, note it and continue.
Output Format
Return your findings as structured markdown:
## Hooks & MCP Expert Knowledge
### Hook System
- [All event types with descriptions]
- [hooks.json schema]
- [Matcher patterns and syntax]
- [Timeout defaults and recommendations]
- [Output handling: stdout/stderr/exit codes]
- [Anti-patterns: broad matchers, missing timeouts, duplicate behavior]
### MCP Server System
- [.mcp.json schema and fields]
- [Transport types and configuration]
- [Context cost of MCP tools]
- [Environment variable handling]
- [Anti-patterns: server sprawl, unused servers]
### Best Practices
- [Hook authoring recommendations]
- [MCP configuration recommendations]
- [Common anti-patterns]
### New/Updated Features
- [Any recently changed behavior]
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 4d ago First seen · 101 lines · 28 tokens per session scan A 91fb307030e1
research-hooks-mcp is an agent published in the GitHub repository acostanzo/quickstop (46 stars, last pushed 2mo ago), licensed MIT. It adds 28 tokens to every session and 714 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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