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.
git clone --depth 1 https://github.com/truss-security/truss-agent-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/rules/truss-security/truss-agent-mcp/truss-agent-mcp-core)<a href="https://agentmods.dev/rules/truss-security/truss-agent-mcp/truss-agent-mcp-core"><img src="https://agentmods.dev/badge/rules/truss-security/truss-agent-mcp/truss-agent-mcp-core/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/rules/truss-security/truss-agent-mcp/truss-agent-mcp-core"><img src="https://agentmods.dev/badge/rules/truss-security/truss-agent-mcp/truss-agent-mcp-core.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 | $0.00219 | $0.00219 |
| Opus 5 | $0.00110 | $0.00110 |
| Sonnet 5 | $0.00044 | $0.00044 |
| Haiku 4.5 | $0.00022 | $0.00022 |
Grade A, and why
truss-agent-mcp-core 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 8d 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
truss-agent-mcp core rules
Read AGENTS.md for full operations.
Security
- Never commit secrets;
.envis gitignored. TRUSS_API_KEYin host env only — never in MCP tool args or error output.- No internal Truss endpoints, private repo names, or unreleased API docs.
API scope
- Public tier only:
/product/search,/product/search/stix,/product/{id}/stix. - Do not add admin-route tools without explicit API + SDK support.
Code changes
- Minimize diff; match existing TypeScript ESM style.
- Tool changes: update
schemas.ts,register-tools.ts,instructions.ts, anddocs/04-mcp-tool-catalog.md. - Default IOC-safe summaries;
include_indicatorsis opt-in. - Run
npm run build && npm testafter substantive changes.
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.
- 8d ago First seen · 24 lines · 219 tokens per session scan A 89245ae6e54a
truss-agent-mcp-core is a cursor rule published in the GitHub repository truss-security/truss-agent-mcp (0 stars, last pushed 15d ago), licensed MIT. It adds 219 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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