What is insitu AGENTS.md?

Project-specific instructions for Insitu, a local MCP server that stores reusable roles, skills, and project-specific working protocols. A role describes how an agent should act, while a skill describes a reusable capability or procedure.

Managing project context, roles, skills, versioned packs, installation steps, validation findings, and provenance records.

They define the supported design and prevent the implementation from adding tools or behavior that the project does not specify.

How srmackey/insitu configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to srmackey/insitu. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/srmackey/insitu/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/srmackey/insitu

Made for: Codex, OpenCode.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/srmackey/insitu/agents-md/github.svg)](https://agentmods.dev/instructions/srmackey/insitu/agents-md)

Your own site

<a href="https://agentmods.dev/instructions/srmackey/insitu/agents-md"><img src="https://agentmods.dev/badge/instructions/srmackey/insitu/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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/srmackey/insitu/agents-md"><img src="https://agentmods.dev/badge/instructions/srmackey/insitu/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 965 This file is loaded in full into every session.

When invoked 965 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

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	$0.00965	$0.00965
Opus 5.5	$0.00386	$0.00386
Sonnet 5.5	$0.00193	$0.00193
Haiku 4.5	$0.00097	$0.00097

Measured 15d ago against content hash 748158053640, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

insitu 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 15d 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.

AGENTS.md · 55 lines

How it starts

The opening of the file, as written. The whole thing — 55 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md — Insitu

Guidance for agents and contributors working in this repo.

Product. Insitu is a portable MCP server for situated identity: who you are here. It stores reusable articles, roles, skills, and versioned packs, and composes a project-specific protocol.

Agent stance

You are a careful steward of a small, markdown-first MCP. Files on disk are the truth. Insitu runs no git and has no subprocess surface; keep it that way. Prefer the existing primitives (article, project map, resolve_protocol) before adding new ones.

Stack

Python 3.11+, uv, FastMCP, Pydantic v2
Markdown + YAML frontmatter on disk; no required database in v1
Tests with pytest under tests/
uv sync / uv run pytest / uv run insitu

Invariants

A protocol is composed, never a catalog row. Session start is resolve_protocol.
An article is one markdown file under the user's vault articles/. Why-logs live under provenance/<id>.md and are not articles. Leftover *.prov.md under articles/ is also not an article.
Outside an install, the project key is the working folder basename (projects/<folder>/). When INSITU_ROOT names a folder that holds nexus.md, the key is the address from that file: the nexus name, or nexus/node. On disk / encodes as ~ (projects/nexus~node/), so maps stay flat files. _global is unchanged. A missing project is a structured miss, not a catalog scan.
Vault root is INSITU_HOME / --vault / ~/.insitu. One vault per process. INSITU_ROOT names the install tree. It is not a second vault.
materialize writes the composed protocol and host adapters from platforms.yaml beside nexus.md. enabled is the list, and each definition supplies the project path. With no environment file it writes AGENTS.md only when that file is missing or already stamped, and reports platform_source: default. It never writes CLAUDE.md. An unstamped AGENTS.md is left as it is.
Insitu never runs git and never shells out. Mutating tools write files and return the paths they wrote. Version-controlling a vault is the operator's business.
One version number. src/insitu/__init__.py holds it, pyproject.toml derives it, and a test asserts the DESIGN header agrees.

Read the full file on GitHub · 55 lines

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.

15d ago Changed · +1 lines · +51 tokens per session 748158053640
16d ago Changed · +11 tokens per session f98350366fb8
1mo ago Changed · +146 tokens per session efe294d4467e
1mo ago Changed · +2 lines · +48 tokens per session 725e1de3ce9d
1mo ago Changed · +2 lines · +52 tokens per session 5e439166dbea
1mo ago Changed · +2 lines · -70 tokens per session bb71c0aa192e
2mo ago Changed · -95 tokens per session 62f7d0c13e58
2mo ago First seen · 48 lines · 822 tokens per session scan A e337214be546

Subscribe to this mod's changes

insitu AGENTS.md is an instructions file published in the GitHub repository srmackey/insitu (0 stars, last pushed 16d ago), licensed MIT. It adds 965 tokens to every session, about $0.0039 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 2026-08-31.

agent-instructions agent-skills ai-agents mcp mcp-server model-context-protocol

insitu AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
insitu AGENTS.mdsrmackey/insitu	Instructions file	0	16d ago	MIT	A	965	Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	9,719	GitHub Copilot
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	5,516	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	today	MIT	A	4,680	Codex, OpenCode
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	3,093	GitHub Copilot
vscode model-prompts.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	2,022	GitHub Copilot

insitu: Instructions file for Codex