Borrowing it
Nothing to install: this file belongs to kannon-email/kannon. 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/kannon-email/kannon/main/CLAUDE.mdgit clone --depth 1 https://github.com/kannon-email/kannonWrote 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/kannon-email/kannon/claude-md)<a href="https://agentmods.dev/instructions/kannon-email/kannon/claude-md"><img src="https://agentmods.dev/badge/instructions/kannon-email/kannon/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/kannon-email/kannon/claude-md"><img src="https://agentmods.dev/badge/instructions/kannon-email/kannon/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 | $0.00266 | $0.00266 |
| Opus 5.5 | $0.00106 | $0.00106 |
| Sonnet 5.5 | $0.00053 | $0.00053 |
| Haiku 4.5 | $0.00027 | $0.00027 |
Grade A, and why
kannon 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 2mo 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
Database Migrations (dbmate)
Migrations use dbmate. Always use dbmate to create a new migrations. Please in the same commits do not add multiple migrations
Commit messages
Conventional Commits are mandatory: <type>[(scope)][!]: <description>, with feat, fix, perf, revert, docs, refactor, test, build, ci, chore. release-please derives the version and CHANGELOG.md from them, and PR titles must follow the same format (PRs are squash-merged). See CONTRIBUTING.md.
Agent skills
Issue tracker
GitHub issues in kannon-email/kannon, via the gh CLI. See docs/agents/issue-tracker.md.
Triage labels
Canonical defaults (needs-triage, needs-info, ready-for-agent, ready-for-human, wontfix). See docs/agents/triage-labels.md.
Domain docs
Single-context: CONTEXT.md + docs/adr/ at the repo root. See docs/agents/domain.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.
- 2mo ago First seen · 23 lines · 266 tokens per session scan A 29e1850249b6
kannon CLAUDE.md is an instructions file published in the GitHub repository kannon-email/kannon (84 stars, last pushed 2d ago), licensed Apache-2.0. It adds 266 tokens to every session, about $0.0011 per session on Opus 5.5. 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.
kannon CLAUDE.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| kannon CLAUDE.mdkannon-email/kannon | Instructions file | 84 | 2d ago | Apache-2.0 | A | 266 | Claude Code |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 9,719 | GitHub Copilot |
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| vscode oss-third-party-notices.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 5,516 | GitHub Copilot |
| vscode copilot-instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 3,093 | GitHub Copilot |
| deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness | Instructions file | 274k | 2d ago | MIT | A | 4,313 | Codex, OpenCode |