Borrowing it
Nothing to install: this file belongs to herry2059/project-os-for-codex. 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/herry2059/project-os-for-codex/main/AGENTS.mdgit clone --depth 1 https://github.com/herry2059/project-os-for-codexWrote 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/herry2059/project-os-for-codex/agents-md)<a href="https://agentmods.dev/instructions/herry2059/project-os-for-codex/agents-md"><img src="https://agentmods.dev/badge/instructions/herry2059/project-os-for-codex/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/herry2059/project-os-for-codex/agents-md"><img src="https://agentmods.dev/badge/instructions/herry2059/project-os-for-codex/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 | $0.00656 | $0.00656 |
| Opus 5.5 | $0.00262 | $0.00262 |
| Sonnet 5.5 | $0.00131 | $0.00131 |
| Haiku 4.5 | $0.00066 | $0.00066 |
Grade A, and why
project-os-for-codex 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 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.
How it starts
The opening of the file, as written. The whole thing — 45 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AI contributor rules
These rules apply to Codex and every contributor working in this repository.
Product truth
- This is a real open-source project, not a UI demo. Do not add fake success states, fake production data, or claims that are not implemented.
- Project OS for Codex makes AI-assisted projects visible, resumable, and handoff-ready through project context, Git evidence, next actions, and structured handoffs.
- Work one vertical slice at a time. Finish and verify one end-to-end path before widening the surface.
Architecture and security
- Every persisted business record must belong to a
workspaceId. Requests must derive the workspace from a verified session or AI credential, never from an untrusted body field. - AI credentials must be short-lived, revocable, hashed at rest, scoped to the minimum project and actions, and covered by audit logs.
- Never put passwords, access tokens, provider keys, private endpoints, customer data, or production exports in source, logs, screenshots, prompts, issues, or commits.
- AI may read context and prepare drafts. Payment, deletion, role changes, credential management, publication, deployment, and rollback always require explicit human confirmation.
- Public error messages must not reveal private providers, internal routes, balances, or infrastructure details.
Development workflow
- Read
README.md,docs/INTERFACES.md, and the relevant source before changing behavior. - Preserve user changes and keep commits focused on the requested slice.
- Use
pnpmfor dependency and build commands. - Before committing, run
pnpm run checkand inspect the real affected UI in both light and dark themes. - A change is complete only when the real path works end to end. A diff or a mocked response is not acceptance evidence.
Agent integration contract
- Prefer MCP or documented API/CLI tools over browser automation.
- Never ask users to paste their website password into an AI conversation.
- Project event writes require
Idempotency-Key, server-derived actor identity, input validation, workspace and project isolation, and an audit event. - Keep dangerous tools out of the MCP surface until a human approval workflow exists.
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 · 45 lines · 656 tokens per session scan A 1fdfbb9de211
project-os-for-codex AGENTS.md is an instructions file published in the GitHub repository herry2059/project-os-for-codex (24 stars, last pushed 3mo ago), licensed Apache-2.0. It adds 656 tokens to every session, about $0.0026 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.
project-os-for-codex AGENTS.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| project-os-for-codex AGENTS.mdherry2059/project-os-for-codex | Instructions file | 24 | 3mo ago | Apache-2.0 | A | 656 | 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 |