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/azure-samples/mcp-agent-langchainjs/scriptgit clone --depth 1 https://github.com/Azure-Samples/mcp-agent-langchainjsWhat 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 | $0.00104 | $0.00104 |
| Opus 5 | $0.00052 | $0.00052 |
| Sonnet 5 | $0.00021 | $0.00021 |
| Haiku 4.5 | $0.00010 | $0.00010 |
Grade A, and why
mcp-agent-langchainjs script.instructions.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
Guidance for Code Generation
- Scripts are written in JavaScript (ESM) and use Node.js
- Do not use any extra dependencies, unless abslutely necessary: in that case ask the user first for approval
- A script is a single file, and must not be split into multiple files
If you get it right you'll get a 1000$ bonus, but if you get it wrong you'll be fired.
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.
- 2d ago First seen · 12 lines · 104 tokens per session scan A d27c48ca1c8d
mcp-agent-langchainjs script.instructions.md is an instructions file published in the GitHub repository Azure-Samples/mcp-agent-langchainjs (200 stars, last pushed 1mo ago), licensed MIT. It adds 104 tokens to every session, about $0.0005 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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