Borrowing it
Nothing to install: this file belongs to jbctechsolutions/mcp-mercury. 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/jbctechsolutions/mcp-mercury/main/CLAUDE.mdgit clone --depth 1 https://github.com/jbctechsolutions/mcp-mercuryWrote 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/jbctechsolutions/mcp-mercury/claude-md)<a href="https://agentmods.dev/instructions/jbctechsolutions/mcp-mercury/claude-md"><img src="https://agentmods.dev/badge/instructions/jbctechsolutions/mcp-mercury/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 | $0.00216 | $0.00216 |
| Opus 5 | $0.00108 | $0.00108 |
| Sonnet 5 | $0.00043 | $0.00043 |
| Haiku 4.5 | $0.00022 | $0.00022 |
Grade A, and why
mcp-mercury 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 7d 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
mcp-mercury
Read-only MCP server for Mercury business banking. Modeled on the conventions
of mcp-office365 (same org): strict TS, ESM, zod-validated tool inputs,
hand-written JSON schemas in the tool list, vitest.
Hard rules
- Read-only forever. No payment, recipient, or write endpoints — if a task asks for one, stop and confirm with Joel first.
- The API token never appears in code, logs, errors, fixtures, or tests.
It is resolved at runtime from 1Password (
Mercury API - read only, accountjbctechsolutions.1password.com) orMERCURY_API_TOKEN(tests only). - Statement downloads only from
*.mercury.comover HTTPS (token-leak guard). - gitleaks pre-commit runs here; never bypass with
--no-verify.
Commands
npm test/npm run typecheck/npm run build
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.
- 7d ago First seen · 20 lines · 216 tokens per session scan A 4bd8240e85ee
mcp-mercury CLAUDE.md is an instructions file published in the GitHub repository jbctechsolutions/mcp-mercury (0 stars, last pushed 2mo ago), licensed MIT. It adds 216 tokens to every session, about $0.0011 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 2026-08-31.
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