CodebuffAI/freebuff is a collection of free AI products for coding, building, and research, including terminal, desktop, web, cloud, and chat interfaces. Developers use its agents to work on projects, repositories, and full-stack applications without subscriptions, credits, or API keys. The catalogue entries support work with this coding-agent project.
Borrowing it
Nothing to install: this file belongs to CodebuffAI/freebuff. 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/CodebuffAI/freebuff/main/AGENTS.mdgit clone --depth 1 https://github.com/CodebuffAI/freebuffWrote 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/codebuffai/freebuff/agents-md)<a href="https://agentmods.dev/instructions/codebuffai/freebuff/agents-md"><img src="https://agentmods.dev/badge/instructions/codebuffai/freebuff/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/codebuffai/freebuff/agents-md"><img src="https://agentmods.dev/badge/instructions/codebuffai/freebuff/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 | $0.00259 | $0.00259 |
| Opus 5.5 | $0.00104 | $0.00104 |
| Sonnet 5.5 | $0.00052 | $0.00052 |
| Haiku 4.5 | $0.00026 | $0.00026 |
Grade A, and why
freebuff 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.
What it actually says
Freebuff
Freebuff is the public, free coding agent built from the Codebuff agent framework.
Key Technologies
- TypeScript monorepo
- Bun runtime and package manager
- OpenTUI + React CLI
- JS/TS SDK
- Composable agent runtime
Repo Map
cli/- TUI client and local UXsdk/- JS/TS SDK used by the CLI and external userscommon/- shared types, tools, schemas, and utilitiesagents/- public agent definitionspackages/agent-runtime/- agent runtime and tool handlingpackages/code-map/- source parsing helperspackages/llm-providers/- public LLM provider shimsfreebuff/- Freebuff CLI, release files, and e2e testsscripts/tmux/- tmux helpers for CLI testing
Conventions
- Use
bun installandbun run. - Prefer dependency injection over module mocking.
- Run interactive CLI tests in tmux.
- Do not force-push
main.
Docs
docs/agents-and-tools.mddocs/testing.md
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 · 36 lines · 259 tokens per session scan A 20247027a26d
freebuff AGENTS.md is an instructions file published in the GitHub repository CodebuffAI/freebuff (13,988 stars, last pushed yesterday), licensed Apache-2.0. It adds 259 tokens to every session, about $0.0010 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.
freebuff AGENTS.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| freebuff AGENTS.mdCodebuffAI/freebuff | Instructions file | 14k | yesterday | Apache-2.0 | A | 259 | 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 | today | MIT | A | 7,461 | Codex, OpenCode |
| vscode oss-third-party-notices.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 5,516 | GitHub Copilot |
| 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 |
| deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness | Instructions file | 274k | 2d ago | MIT | A | 4,313 | Codex, OpenCode |