LangBot is an open-source platform for connecting language models to instant-messaging services so developers can build chatbots that converse, use tools, and execute tasks. It supports bot management, knowledge bases, plugins, and multiple chat platforms, and the catalogue entries provide skills, MCP tools, and instructions for working with it.
Borrowing it
Nothing to install: this file belongs to langbot-app/LangBot. 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/langbot-app/LangBot/master/AGENTS.mdgit clone --depth 1 https://github.com/langbot-app/LangBotWrote 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/langbot-app/langbot/agents-md)<a href="https://agentmods.dev/instructions/langbot-app/langbot/agents-md"><img src="https://agentmods.dev/badge/instructions/langbot-app/langbot/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/langbot-app/langbot/agents-md"><img src="https://agentmods.dev/badge/instructions/langbot-app/langbot/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 | $0.02960 | $0.02960 |
| Opus 5.5 | $0.01184 | $0.01184 |
| Sonnet 5.5 | $0.00592 | $0.00592 |
| Haiku 4.5 | $0.00296 | $0.00296 |
Grade A, and why
LangBot 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 today.
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 — 144 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AGENTS.md
This file guides code agents working in the LangBot main repository. CLAUDE.md is a symlink to this file; edit AGENTS.md.
Read ARCHITECTURE.md before non-trivial backend, frontend, runtime, plugin, Box, MCP, persistence, or cross-repo SDK changes. This file is the working checklist; ARCHITECTURE.md is the system map.
Repository Layout
This is a monorepo: Core, WebUI, public docs, official plugins and agent skills share one checkout but not one release.
| Path | Contents | Notes |
|---|---|---|
src/langbot/ |
Core backend (Quart, pkg/api, pkg/platform, pkg/pipeline, pkg/plugin, ...) |
Python >=3.11,<4.0, managed by uv. |
web/ |
WebUI: Vite + React Router 7 + shadcn/ui + Tailwind | pnpm; dev server 3000, backend 5300. |
docs/ |
Public user/developer documentation, published at https://langbot.app/docs/ | Fumapress, Node.js 24, zh/en/ja trees. Write for users and plugin authors; keep the three languages in step. |
dev-docs/ |
Internal design notes, contracts, reviews and test reports for maintainers and agents | Not published. architecture/ (Application API, i18n, ...), event-based-agents/ (standard events/platform APIs and per-adapter records), review/, OpenAPI snapshots. |
plugins/ |
Official plugins (Runner/, KnowledgeEngine/, misc/), indexed by plugins/catalog.json |
Independent packages, CI and Marketplace releases; never bundled in Core artifacts. See plugins/AGENTS.md. |
skills/ |
Agent skills (skills/skills/<name>/SKILL.md) and the lbs QA harness |
Single source of truth for LangBot agent skills. See skills/AGENTS.md. |
tests/ |
Core unit, integration, e2e and manual tests | |
tools/ |
Regression harness, contracts, profiles and fixtures | See tools/README.md. |
scripts/ |
Maintenance scripts, including catalog export and SDK code generation | |
docker/, packaging/, examples/, res/ |
Deployment manifests, distro packages, integration examples, static resources |
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.
- today Changed · +9 lines · +1,040 tokens per session aebd886eb147
- 8d ago Changed · +1 lines · +44 tokens per session a3a63d08eb0f
- 9d ago Changed · +1 lines · +41 tokens per session 4b516b5a5f99
- 14d ago Changed · +2 lines · +30 tokens per session b8c10dad4594
- 17d ago Changed · +1 lines · +77 tokens per session 63111099aff1
- 19d ago Changed · +1 lines · +41 tokens per session 4c182bd010ee
- 21d ago Changed · +11 lines · +425 tokens per session bdc4db8be4b8
- 1mo ago Changed · +2 lines · +69 tokens per session b75f7bf0fbfb
- 1mo ago Changed · +3 tokens per session ada0da8bef4a
- 2mo ago First seen · 116 lines · 1,190 tokens per session scan A 1ca60e8b5d6a
LangBot AGENTS.md is an instructions file published in the GitHub repository langbot-app/LangBot (18,745 stars, last pushed yesterday), licensed Apache-2.0. It adds 2,960 tokens to every session, about $0.0118 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.
LangBot AGENTS.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| LangBot AGENTS.mdlangbot-app/LangBot | Instructions file | 19k | yesterday | Apache-2.0 | A | 2,960 | 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 |