Borrowing it
Nothing to install: this file belongs to semaphor-analytics/agent-plugin. 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/semaphor-analytics/agent-plugin/main/AGENTS.mdgit clone --depth 1 https://github.com/semaphor-analytics/agent-pluginWrote 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/semaphor-analytics/agent-plugin/agents-md)<a href="https://agentmods.dev/instructions/semaphor-analytics/agent-plugin/agents-md"><img src="https://agentmods.dev/badge/instructions/semaphor-analytics/agent-plugin/agents-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/semaphor-analytics/agent-plugin/agents-md"><img src="https://agentmods.dev/badge/instructions/semaphor-analytics/agent-plugin/agents-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 | $0.00417 | $0.00417 |
| Opus 5.5 | $0.00167 | $0.00167 |
| Sonnet 5.5 | $0.00083 | $0.00083 |
| Haiku 4.5 | $0.00042 | $0.00042 |
Grade A, and why
agent-plugin AGENTS.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 20d 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
Semaphor Agent Plugin - Agent Guide
This repository is the customer-facing Semaphor Agent Plugin for Claude Code,
Codex and future coding-agent hosts. The installable package is
plugins/semaphor.
Operating Rules
- Read
ACTIVE_IMPLEMENTATION_CONTEXT.md(repo root) before changing or reviewing this package. It holds the active scope and reviewer guardrails. - The plugin is analytics-first: it connects an agent to the hosted Semaphor
MCP (
https://semaphor.cloud/api/mcp) and ships one skill,skills/semaphor-analytics, that teaches governed analytics. - Keep the package host-neutral. Claude Code and Codex use the same skill and
the same
.mcp.json. - Analytical behavior belongs in Semaphor's MCP server, not in this package. If guidance needs a workaround, fix the server contract instead.
- Never promise that a tool exists. The tool list depends on who is calling (role, OAuth or token, scopes). The skill says so.
- Use camelCase tool arguments in examples (
responseFormat). The server rejects any other spelling. - Do not add scripts that call the MCP outside the agent host. Headless and
embedded use is a client header setup with an MCP project token from the
environment variable
SEMAPHOR_MCP_TOKEN. - Before publishing marketplace-visible plugin changes, follow the release
versioning SOP in the Semaphor app internal docs:
docs/engineering/agent-plugin/RELEASE_VERSIONING.md. Keep versioning details out of customer-facing README content. - Do not commit tokens, local env files, generated run artifacts, screenshots, private notes or release evidence.
Checks
From the repository root:
npm run version:plugin:check
npm run validate:plugin
npm run validate:codex-plugin
npm run validate:marketplaces
validate:marketplaces includes claude plugin validate --strict.
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.
- 20d ago First seen · 44 lines · 417 tokens per session scan A 5e3fe0c1edc7
agent-plugin AGENTS.md is an instructions file published in the GitHub repository semaphor-analytics/agent-plugin (2 stars, last pushed 9d ago), licensed MIT. It adds 417 tokens to every session, about $0.0017 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 2026-10-17.
agent-plugin AGENTS.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| agent-plugin AGENTS.mdsemaphor-analytics/agent-plugin | Instructions file | 2 | 9d ago | MIT | A | 417 | Codex, OpenCode |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 9,719 | GitHub Copilot |
| next.js AGENTS.mdvercel/next.js | Instructions file | 143k | yesterday | MIT | A | 7,461 | Codex, OpenCode |
| langchain AGENTS.mdlangchain-ai/langchain | Instructions file | 149k | yesterday | MIT | A | 4,680 | Codex, OpenCode |
| 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 |