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 instructions/vitalio-sh/thunderbird-cli/claude-mdgit clone --depth 1 https://github.com/vitalio-sh/thunderbird-cliWrote 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/vitalio-sh/thunderbird-cli/claude-md)<a href="https://agentmods.dev/instructions/vitalio-sh/thunderbird-cli/claude-md"><img src="https://agentmods.dev/badge/instructions/vitalio-sh/thunderbird-cli/claude-md.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 5.1 | $0.00071 | $0.00071 |
| Opus 5 | $0.00036 | $0.00036 |
| Sonnet 5 | $0.00014 | $0.00014 |
| Haiku 4.5 | $0.00007 | $0.00007 |
Grade A, and why
thunderbird-cli CLAUDE.md 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 6d 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.
What it actually says
See AGENTS.md — same content, Claude Code just reads it from this filename.
For the end-user skill (what Claude loads when the user is actually using thunderbird-cli to manage email), see skills/thunderbird-cli/SKILL.md.
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.
- 6d ago First seen · 4 lines · 71 tokens per session scan A b55553cc7a24
thunderbird-cli CLAUDE.md is an instructions file published in the GitHub repository vitalio-sh/thunderbird-cli (40 stars, last pushed 1mo ago), licensed MIT. It adds 71 tokens to every session, about $0.0004 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.
Other instructions, from other repositories
imap-mcp-pro CLAUDE.md
Claude Code instructions for Temple-of-Epiphany/imap-mcp-pro, covering claude.md, project overview, common development commands, architecture and core components.
mcp-email-server AGENTS.md
AGENTS.md instructions for Wh1isper/mcp-email-server, covering repository overview, project conventions, current architecture direction, development workflow and documentation requirements.
imap-mcp-server AGENTS.md
AGENTS.md instructions for nikolausm/imap-mcp-server, covering agents.md, architecture, build / test commands, security rules (must follow) and conventions.
imap-mcp-server CLAUDE.md
Claude Code instructions for nikolausm/imap-mcp-server, covering claude.md and claude-specific notes.
proton-safe-mcp mermaid.instructions.md
Instructions for fbossiere/proton-safe-mcp, covering mermaid ai skills, workflow, lm tools — call these for every diagram interaction, vs code commands and diagram editing & preview.
agenticmail CLAUDE.md
Claude Code instructions for agenticmail/agenticmail, covering claude code instructions for agenticmail, option a — one-line installer (recommended) and option b — manual.