Borrowing it
Nothing to install: this file belongs to agent-receipts/obsigna. 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/agent-receipts/obsigna/main/AGENTS.mdgit clone --depth 1 https://github.com/agent-receipts/obsignaWrote 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/agent-receipts/obsigna/agents-md)<a href="https://agentmods.dev/instructions/agent-receipts/obsigna/agents-md"><img src="https://agentmods.dev/badge/instructions/agent-receipts/obsigna/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/agent-receipts/obsigna/agents-md"><img src="https://agentmods.dev/badge/instructions/agent-receipts/obsigna/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 | $0.01712 | $0.01712 |
| Opus 5.5 | $0.00685 | $0.00685 |
| Sonnet 5.5 | $0.00342 | $0.00342 |
| Haiku 4.5 | $0.00171 | $0.00171 |
Grade A, and why
obsigna 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 — 135 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AGENTS.md
Monorepo for the Agent Receipts protocol — cryptographically signed audit trails for AI agent actions. Contains the protocol spec, SDKs in three languages, an MCP proxy, and the documentation site.
Monorepo layout
spec/ # Protocol specification and JSON schemas
sdk/go/ # Go SDK (receipt, store, taxonomy)
sdk/ts/ # TypeScript SDK (@obsigna/sdk-ts)
sdk/py/ # Python SDK (obsigna)
mcp-proxy/ # MCP STDIO proxy with audit, policy, and receipts (Go)
hook/ # PostToolUse hook binary for Claude Code and other runtimes (Go)
integrations/ # Per-agent-runtime adapters (e.g. opencode-plugin; hook to migrate here)
site/ # Documentation site (Astro)
cross-sdk-tests/ # Cross-language receipt verification tests
formal/ # Formal models (Alloy) machine-checking protocol properties
Each subdirectory has its own AGENTS.md with project-specific details.
Quick reference
| Component | Language | Test command | Build command |
|---|---|---|---|
| sdk/go | Go | go test ./... |
go build ./... |
| sdk/ts | TypeScript | pnpm test |
pnpm build |
| sdk/py | Python | uv run pytest |
uv build |
| mcp-proxy | Go | go test ./... |
go build ./cmd/... (obsigna-mcp + mcp-proxy shim) |
| hook | Go | go test ./... |
go build ./cmd/... (obsigna-hook + agent-receipts-hook shim) |
| site | TypeScript | — | pnpm build |
| spec | — | — | JSON schema validation |
Operational state
Operational state lives at docs/operations/current.md. Read this first when starting a session. Update it when nodes change state.
Conventions
- All changes go through pull requests — never push directly to main
- CI is path-filtered: changes to
sdk/go/only trigger Go SDK CI - mcp-proxy CI also triggers on
sdk/go/changes (dependency) - hook CI also triggers on
sdk/go/changes (dependency) - Site deploys on
site/**orspec/**changes - Go modules share a repo-root
go.work(see Go workspace); never add a localreplacedirective in any publishedgo.mod - Run language-specific linters before committing (go vet, biome, ruff)
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 · 135 lines · 1,712 tokens per session scan A 9fb5bd56f40c
obsigna AGENTS.md is an instructions file published in the GitHub repository agent-receipts/obsigna (20 stars, last pushed today), licensed Apache-2.0. It adds 1,712 tokens to every session, about $0.0068 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.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
deepseek-harness AGENTS.md
AGENTS.md instructions for deepseek-ai/deepseek-harness, covering agents.md, pre-stable apis and released session data, repository layout, commands and host sandbox failures.