Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/langbot-app/langbot/langbot-plugin-devnpx skills add langbot-app/LangBot --skill langbot-plugin-devgit clone --depth 1 https://github.com/langbot-app/LangBotWhat 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 | $0.00110 | $0.03934 |
| Opus 5 | $0.00055 | $0.01967 |
| Sonnet 5 | $0.00022 | $0.00787 |
| Haiku 4.5 | $0.00011 | $0.00393 |
Grade A, and why
langbot-plugin-dev scanned grade A with 1 finding 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 2d 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl -X POST $BASE/api/v1/user/init \ How it starts
The opening of the file, as written. The whole thing — 485 lines — stays where its author put it; the contents beside it link to each section on GitHub.
LangBot Plugin Development & Debugging
Controlling a running instance via MCP
Beyond writing code, you can drive a live LangBot instance over MCP — no raw
HTTP needed. Two MCP servers exist (both reuse existing API keys; see AGENTS.md):
- LangBot instance —
http://<host>:5300/mcp(auth: web-UIlbk_key or theapi.global_api_keyfromconfig.yaml). Manage bots, pipelines, models, knowledge bases, and skills. See thelangbot-mcp-opsskill. - LangBot Space marketplace —
https://space.langbot.app/mcp(auth: Personal Access Token). Search plugins / MCP servers / skills. See thelangbot-space-opsskill.
Any change to an agent-accessible HTTP API endpoint must keep the matching MCP tool and these skills in sync.
Plugin Architecture
A LangBot plugin consists of:
MyPlugin/
├── manifest.yaml # Plugin metadata, config schema
├── main.py # BasePlugin subclass (entry point, shared state)
├── components/
│ ├── event_listener/ # Hook pipeline events
│ │ ├── collector.yaml
│ │ └── collector.py
│ ├── commands/ # !command handlers
│ │ ├── mycommand.yaml
│ │ └── mycommand.py
│ └── tools/ # LLM function-call tools
│ ├── mytool.yaml
│ └── mytool.py
Each component has a .yaml (metadata) and .py (implementation).
README & i18n convention (enforced on the marketplace)
A plugin published to LangBot Space serves a localized README on its detail page.
The resolver (langbot-space PluginService.GetPluginREADME) works like this:
- Root
README.mdMUST be in English. It is the default and the fallback — when no per-language README matches the viewer's locale, the page serves the rootREADME.md. A non-English root README makes the English/default view show the wrong language. - All other languages live under
readme/README_{lang}.md— e.g.readme/README_zh_Hans.md,readme/README_ja_JP.md. The 8 supported locales:en_US, zh_Hans, zh_Hant, ja_JP, th_TH, vi_VN, es_ES, ru_RU. manifest.yamlmetadata.label/metadata.descriptionshould carry the same 8-locale i18n set (repositorymust be a real, alive URL).
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 2d ago First seen · 485 lines · 110 tokens per session scan A 2b92d4ba9e36
langbot-plugin-dev is a skill published in the GitHub repository langbot-app/LangBot (17,616 stars, last pushed 2d ago), licensed Apache-2.0. It adds 110 tokens to every session and 3,934 once invoked, about $0.0006 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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