Borrowing it
Nothing to install: this file belongs to frangelbarrera/agentic-harness. 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/frangelbarrera/agentic-harness/main/AGENTS.mdgit clone --depth 1 https://github.com/frangelbarrera/agentic-harnessWrote 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/frangelbarrera/agentic-harness/agents-md)<a href="https://agentmods.dev/instructions/frangelbarrera/agentic-harness/agents-md"><img src="https://agentmods.dev/badge/instructions/frangelbarrera/agentic-harness/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/frangelbarrera/agentic-harness/agents-md"><img src="https://agentmods.dev/badge/instructions/frangelbarrera/agentic-harness/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 | $0.01211 | $0.01211 |
| Opus 5.5 | $0.00484 | $0.00484 |
| Sonnet 5.5 | $0.00242 | $0.00242 |
| Haiku 4.5 | $0.00121 | $0.00121 |
Grade A, and why
agentic-harness 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 — 94 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AGENTS.md — System prompt for AI coding agents contributing to Agentic Harness
You are contributing to Agentic Harness, an open-source agent harness for Python.
Project Context
Agentic Harness is NOT a framework. It is a harness — the control layer that lets
developers orchestrate AI agents without surrendering their prompts, context,
model choice, or budget. Read MANIFESTO.md for the full philosophy.
Architecture in 30 seconds
- Thread: append-only event log (mutates in place for O(1) performance). State = reduce(events).
- Specialist: pre-built role-based agent (12 total: planner, coder, reviewer, tester, debugger, researcher, security-auditor, devops-engineer, data-scientist, product-manager, market-analyst, cost-estimator).
- Playbook Library: 13 domain templates (mobile_app, osint, financial_analysis, ...) + a TaskRouter that classifies natural-language requests into a domain without an LLM call.
- Playbook: YAML manual compiled to a DAG of steps. Each step invokes a specialist or tool. Steps can declare a
review:config for actor-critic iterative refinement. - Executor: walks the DAG, applies middleware (cost guard + verification + token optimizer), runs review loops when configured.
- MCP server: exposes playbooks as tools for Claude Desktop, Cursor, Cline, Zed.
Non-negotiable rules (from MANIFESTO.md)
- No vendor-only features as first-class APIs. If it only exists in OpenAI or only in Anthropic, it is a leak, not a feature.
- No classes named
Runnable,Chain,Workflow, orAgent. Composition = functions. - Token counter is on by default. If you don't know what you spent, you didn't ship.
- No hosted version. Ever. If you add code that requires Agentic Harness Cloud, you're breaking the manifesto.
- No hidden prompts. Every prompt sent to an LLM is a file on disk.
- No magic. If a line does something you can't explain, it's a bug.
- No API keys in code. Read from env. Never log. Never store.
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 · 94 lines · 1,211 tokens per session scan A 2857d932f649
agentic-harness AGENTS.md is an instructions file published in the GitHub repository frangelbarrera/agentic-harness (10 stars, last pushed 4d ago), licensed Apache-2.0. It adds 1,211 tokens to every session, about $0.0048 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.
agentic-harness AGENTS.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| agentic-harness AGENTS.mdfrangelbarrera/agentic-harness | Instructions file | 10 | 4d ago | Apache-2.0 | A | 1,211 | Codex, OpenCode |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | 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 | today | MIT | A | 4,680 | Codex, OpenCode |
| vscode oss-third-party-notices.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 5,516 | GitHub Copilot |
| vscode copilot-instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 3,093 | GitHub Copilot |
| deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness | Instructions file | 275k | 2d ago | MIT | A | 4,313 | Codex, OpenCode |