Borrowing it
Nothing to install: this file belongs to huckncatch/mailmate-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/huckncatch/mailmate-mcp/main/CLAUDE.mdgit clone --depth 1 https://github.com/huckncatch/mailmate-mcpWrote 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/instructions/huckncatch/mailmate-mcp/claude-md)<a href="https://agentmods.dev/instructions/huckncatch/mailmate-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/huckncatch/mailmate-mcp/claude-md/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/instructions/huckncatch/mailmate-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/huckncatch/mailmate-mcp/claude-md.svg" alt="Reviewed on agentmods" width="80" 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 5.1 | $0.01535 | $0.01535 |
| Opus 5.5 | $0.00614 | $0.00614 |
| Sonnet 5.5 | $0.00307 | $0.00307 |
| Haiku 4.5 | $0.00153 | $0.00153 |
Grade A, and why
mailmate-mcp CLAUDE.md scanned grade A with 1 finding 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 today.
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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
**`src/mailmate_mcp/jmap.py`** — Fastmail JMAP client, network only (stdlib `urllib`). `update_keywords` takes a batch of Message-IDs: one `Email/query` with an OR of header filters, an `Email/get` that groups results by The source is not reproduced here
Licensed GPL-3.0
The repository is licensed GPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.
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.
- today Changed · +136 tokens per session 876f9bcdf964
- yesterday Changed · -8 lines · +328 tokens per session 324915f14643
- 3d ago Changed · +1 lines · +68 tokens per session 4a8fcd606c06
- 8d ago Changed · +10 lines · +195 tokens per session eb834335ac99
- 2mo ago First seen · 76 lines · 808 tokens per session scan A d7d0d2218de3
mailmate-mcp CLAUDE.md is an instructions file published in the GitHub repository huckncatch/mailmate-mcp (4 stars, last pushed today), licensed GPL-3.0. It adds 1,535 tokens to every session, about $0.0061 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
mailmate-mcp CLAUDE.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| mailmate-mcp CLAUDE.mdhuckncatch/mailmate-mcp | Instructions file | 4 | today | GPL-3.0 | A | 1,535 | Claude Code |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 9,719 | GitHub Copilot |
| next.js AGENTS.mdvercel/next.js | Instructions file | 143k | today | MIT | A | 7,461 | Codex, OpenCode |
| vscode oss-third-party-notices.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 5,685 | GitHub Copilot |
| langchain AGENTS.mdlangchain-ai/langchain | Instructions file | 149k | today | MIT | A | 4,680 | Codex, OpenCode |
| vscode copilot-instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 3,086 | GitHub Copilot |
| deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness | Instructions file | 281k | today | MIT | A | 4,335 | Codex, OpenCode |