Claudian is an Obsidian plugin that embeds AI coding agents in a note vault, allowing them to read, edit, search, and manage files there. It is for users who want to work with agents alongside their notes, using features such as inline editing, plans, reusable prompts, and external tool connections.
Borrowing it
Nothing to install: this file belongs to YishenTu/claudian. 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/YishenTu/claudian/main/AGENTS.mdgit clone --depth 1 https://github.com/YishenTu/claudianWrote 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/yishentu/claudian/agents-md)<a href="https://agentmods.dev/instructions/yishentu/claudian/agents-md"><img src="https://agentmods.dev/badge/instructions/yishentu/claudian/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/yishentu/claudian/agents-md"><img src="https://agentmods.dev/badge/instructions/yishentu/claudian/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 | $0.02411 | $0.02411 |
| Opus 5 | $0.01205 | $0.01205 |
| Sonnet 5 | $0.00482 | $0.00482 |
| Haiku 4.5 | $0.00241 | $0.00241 |
Grade A, and why
claudian 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 3d 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.
How it starts
The opening of the file, as written. The whole thing — 156 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AGENTS.md
Project
Claudian is an Obsidian plugin that embeds provider-backed coding agents in a sidebar and inline-edit flow. Claude is the default provider. Codex, Grok, OpenCode, and Pi are optional providers that plug into the same conversation model through Conversation.providerId and opaque provider-owned providerState.
Do not assume provider parity. Check each provider's capabilities.ts, registration.ts, and UI config before wiring shared behavior.
Scope Guides
- Before editing a scoped area, read its nearest scoped guide:
src/app/AGENTS.mdsrc/core/AGENTS.mdsrc/features/chat/AGENTS.mdsrc/features/collab/AGENTS.mdsrc/providers/claude/AGENTS.mdsrc/providers/codex/AGENTS.mdsrc/providers/grok/AGENTS.mdsrc/providers/opencode/AGENTS.mdsrc/providers/pi/AGENTS.mdsrc/style/AGENTS.md
AGENTS.md Maintenance
- AGENTS.md is execution context for agents, not general documentation. Keep only repository- or scope-specific information that a capable agent would not reliably know; every statement must change implementation, review, or verification behavior.
- Keep repository-wide rules here; put local ownership, dependencies, invariants, failure modes, verification, and active decisions in the narrowest scoped guide that governs them.
- Do not duplicate inherited guidance or silently contradict it. State a necessary local exception and its rationale explicitly.
- Omit tours, ordinary implementation details, temporary status, and general engineering advice.
- Record a decision only when it is active, surprising from the code, expensive to reverse, and reflects a real tradeoff. State the decision, rationale, and any concrete reconsideration condition; use Git history as the archive.
CLAUDE.mdfiles should import the nearestAGENTS.md; do not duplicate shared guidance there.
Commands
npm run dev
npm run build
npm run typecheck
npm run lint
npm run lint:fix
npm run test
npm run test:watch
npm run test:coverage
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.
- 3d ago Changed · +2 lines · +70 tokens per session 135505d82362
- 6d ago Changed · +5 lines · +109 tokens per session 15362439828b
- 9d ago First seen · 149 lines · 2,232 tokens per session scan A b97e02ddfb8c
claudian AGENTS.md is an instructions file published in the GitHub repository YishenTu/claudian (15,212 stars, last pushed today), licensed MIT. It adds 2,411 tokens to every session, about $0.0121 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 instructions, from other repositories
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
codex AGENTS.md
AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, applying the notice (cutover) and fallback chain (never fail the build).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
spec-kit AGENTS.md
AGENTS.md instructions for github/spec-kit, covering agents.md, about spec kit and specify, quickstart — add a new integration in 5 steps, integration architecture and integrationmanifest — file tracking.