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 rules/langfuse/langfuse-docs/_general-rulesgit clone --depth 1 https://github.com/langfuse/langfuse-docsWhat 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 | $0.00353 | $0.00353 |
| Opus 5 | $0.00177 | $0.00177 |
| Sonnet 5 | $0.00071 | $0.00071 |
| Haiku 4.5 | $0.00035 | $0.00035 |
Grade A, and why
_general-rules 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 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.
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
General rules
- This is the documentation for the Langfuse website.
- We use Fumadocs (App Router). Docs: https://www.fumadocs.dev/docs
- Content lives in the /content folder, organized by section (docs, blog, changelog, guides, etc.).
- App routes are in the /app folder.
- Reusable markdown components are in the /components-mdx folder.
- The devserver is running on http://localhost:3333.
Frontend
- When using tailwindcss, never use explicit colors, always use the default semantic color tokens.
Before committing or opening a PR
- Run
pnpm run formatif you edited any file Prettier formats (.js,.jsx,.mjs,.cjs,.ts,.tsx,.json,.css,.scss,.md,.mdx,.yaml/.yml,.html). CI runspnpm run format:checkand fails on a single unformatted file — this is the format check that most often fails on the first try. - Files in
.prettierignore(content/guides/cookbook/**,content/workshop/**, generated assets inpublic/, lockfiles) are skipped, as are source notebooks (.ipynbincookbook/) since Prettier has no parser for them. If you only touched those, no format step is needed. - Each
.md/.mdxfile must have exactly one H1 (#) heading; CI'scheck_h1job rejects multiples.
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 · 25 lines · 353 tokens per session scan A d1c9adddca94
_general-rules is a cursor rule published in the GitHub repository langfuse/langfuse-docs (237 stars, last pushed 2d ago), licensed MIT. It adds 353 tokens to every session, about $0.0018 per session on Opus 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.
Other cursor rules, from other repositories
mcp-framework
We are in the mcp-framework , a typescript framework that allows construction of model context protocol (mcp) servers. We are implementing the new specification: Overview MCP provides a standardized way for applications to.
langfuse-mcp-general-rules
Cursor rule "langfuse-mcp-general-rules" from avivsinai/langfuse-mcp, covering building and publishing to pypi, version numbering and tagging and build and publish workflow.
jawn
Cursor rule "jawn" from Helicone/helicone, covering helicone jawn controller and tanstack query integration, controller pattern, manager pattern, frontend hooks with tanstack query and type definitions.
state-management
Use the following stack. Do not introduce or recommend Redux or React Context for shared/global state.
architecture
agent-inspect architecture and product context.
nodejs
This guide will walk you through installing Node.js using NVM (Node Version Manager) and setting up pnpm as your package manager.