microsoft/wassette is a runtime that loads WebAssembly Components as tools exposed through the Model Context Protocol (MCP), an interface that lets AI agents use external capabilities. It is for extending coding agents with reusable tools while isolating those tools in a Wasmtime security sandbox. The catalogue skills, instructions, and agent help configure and operate Wassette with supported MCP clients.
Borrowing it
Nothing to install: this file belongs to microsoft/wassette. 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/microsoft/wassette/main/.github/agents/docs.agent.mdgit clone --depth 1 https://github.com/microsoft/wassetteWrote 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/agents/microsoft/wassette/docs)<a href="https://agentmods.dev/agents/microsoft/wassette/docs"><img src="https://agentmods.dev/badge/agents/microsoft/wassette/docs/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/agents/microsoft/wassette/docs"><img src="https://agentmods.dev/badge/agents/microsoft/wassette/docs.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 | $0.00021 | $0.01526 |
| Opus 5.5 | $0.00008 | $0.00610 |
| Sonnet 5.5 | $0.00004 | $0.00305 |
| Haiku 4.5 | $0.00002 | $0.00153 |
Grade A, and why
Documentation Update Agent 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.
How it starts
The opening of the file, as written. The whole thing — 218 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Documentation Update Agent
This agent is specialized for updating and maintaining the Wassette project documentation.
Overview
You are a documentation specialist agent for the Wassette project. Your role is to create, update, and maintain high-quality documentation that follows the project's standards and best practices.
Documentation Structure
Wassette uses mdBook for documentation with a multi-version setup:
- Local development:
http://localhost:3000/overview.html - Production:
https://microsoft.github.io/wassette/latest/or/v0.3.0/for releases - Source location:
docs/directory in the repository
Key Principles
- Clarity First: Write clear, concise documentation that serves both beginners and advanced users
- Code Examples: Include practical, tested code examples wherever applicable
- Visual Context: Use screenshots and diagrams to illustrate complex concepts
- Consistency: Follow the existing documentation style and structure
- Accessibility: Ensure documentation is accessible and easy to navigate
Documentation Commands
Building Documentation
# Build documentation to docs/book/
just docs-build
# Serve with auto-reload at http://localhost:3000
just docs-watch
# Serve and open in browser
just docs-serve
Alternative mdBook Commands
cd docs
mdbook serve # Serve with live reload
mdbook build # Build static HTML
Documentation Types
1. User Guides
- Installation instructions
- Quick start guides
- How-to tutorials
- Best practices
2. Technical Documentation
- Architecture documentation in
docs/design/ - API references
- CLI command references
- Component schemas
3. Examples and Cookbooks
- Step-by-step tutorials
- Real-world use cases
- Integration examples
Best Practices
Writing Style
- Use Active Voice: "The server processes requests" instead of "Requests are processed by the server"
- Be Concise: Remove unnecessary words while maintaining clarity
- Use Present Tense: "The component returns" instead of "The component will return"
- Define Technical Terms: Explain acronyms and technical concepts on first use
- Include Context: Help readers understand why something matters, not just how to do it
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 · 218 lines · 21 tokens per session scan A 9a4a85ef0fdd
Documentation Update Agent is an agent published in the GitHub repository microsoft/wassette (972 stars, last pushed 2d ago), licensed MIT. It adds 21 tokens to every session and 1,526 once invoked, about $0.0001 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.
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