What is polos CLAUDE.md?

Developer instructions for Polos, an open-source runtime that runs AI agents and workflows with features such as retries, scheduling, sandboxes, logs, and monitoring.

Use it to understand the repository architecture and run or modify the Polos command-line tool, orchestrator, UI, and workers.

It gives contributors a map of the Rust service, web interface, worker SDKs, and local development setup.

How polos-dev/polos configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to polos-dev/polos. 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/polos-dev/polos/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/polos-dev/polos

Made for: Claude Code.

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/polos-dev/polos/claude-md/github.svg)](https://agentmods.dev/instructions/polos-dev/polos/claude-md)

Your own site

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

Per session 2,140 This file is loaded in full into every session.

When invoked 2,140 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	$0.02140	$0.02140
Opus 5.5	$0.00856	$0.00856
Sonnet 5.5	$0.00428	$0.00428
Haiku 4.5	$0.00214	$0.00214

Measured 2mo ago against content hash 60ef66d475f1, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

polos CLAUDE.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.

CLAUDE.md · 254 lines

How it starts

The opening of the file, as written. The whole thing — 254 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md — Polos Developer Guide

Polos is the open-source runtime for AI agents. You write the agent; Polos handles sandboxes, durability, approvals, triggers, and observability.

Docs: https://polos.dev/docs | Repo: https://github.com/polos-dev/polos | Discord: https://discord.gg/ZAxHKMPwFG

Architecture

┌─────────────────────────────────────────────────────────┐
│                   polos CLI (Rust)                       │
│        Single binary embedding orchestrator + UI        │
├──────────────────────┬──────────────────────────────────┤
│  Orchestrator (Rust) │         UI (React/TS)            │
│  Axum + Tokio        │    Vite + Tailwind + Shadcn      │
│  PostgreSQL (SQLx)   │    localhost:5173                 │
│  localhost:8080      │                                   │
├──────────────────────┴──────────────────────────────────┤
│              Worker (Python or TypeScript SDK)           │
│  Executes agents/workflows, connects to orchestrator    │
└─────────────────────────────────────────────────────────┘

Orchestrator (orchestrator/) — Core execution engine: durable logs, retries, scheduling, triggers, sandbox management. Rust with Axum, Tokio, SQLx (PostgreSQL).

CLI (server/) — The polos binary. Manages orchestrator and UI processes. Rust with Clap.

UI (ui/) — React 19 dashboard for monitoring agents, workflows, traces. Vite, TypeScript, Tailwind CSS, Shadcn/Radix UI.

Python SDK (sdk/python/) — Agent/workflow definitions, tool system, worker runtime. Pydantic, FastAPI, OpenTelemetry.

TypeScript SDK (sdk/typescript/) — Same capabilities as Python SDK. Fastify, Vercel AI SDK, OpenTelemetry.

Repository Layout

orchestrator/          Rust orchestrator (Axum API server + execution engine)
  migrations/          PostgreSQL migration files (0001–0004)
  src/                 Source code (lib.rs entry point)
  tests/               Integration tests (require DB)
server/                Rust CLI binary (embeds orchestrator + UI at build time)
ui/                    React/TypeScript dashboard
  src/                 Components, pages, hooks, API client
sdk/python/            Python SDK (polos-sdk on PyPI)
  polos/               Package source
  tests/               pytest test suite
sdk/typescript/        TypeScript SDK (@polos/sdk on npm)
  src/                 Package source
  tests/               Test files (*.test.ts)
python-examples/       20+ example agent projects (Python)
typescript-examples/   20+ example agent projects (TypeScript)
create-polos-py/       Python project scaffolder (Click CLI)
create-polos-ts/       TypeScript project scaffolder (Clack prompts)
docs/                  Documentation site (polos.dev)
DESIGN/                Architecture and design documents
scripts/               Build and dev setup scripts

Read the full file on GitHub · 254 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.

2mo ago First seen · 254 lines · 2,140 tokens per session scan A 60ef66d475f1

Subscribe to this mod's changes

polos CLAUDE.md is an instructions file published in the GitHub repository polos-dev/polos (37 stars, last pushed 8mo ago), licensed Apache-2.0. It adds 2,140 tokens to every session, about $0.0086 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.

agent-orchestration agentic-ai ai-agents ai-observability developer-tools durable-execution

polos CLAUDE.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
polos CLAUDE.mdpolos-dev/polos	Instructions file	37	8mo ago	Apache-2.0	A	2,140	Claude Code
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

polos: Instructions file for Claude Code