Borrowing it
Nothing to install: this file belongs to WasmAgent/wasmagent-js. 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/WasmAgent/wasmagent-js/main/CLAUDE.mdgit clone --depth 1 https://github.com/WasmAgent/wasmagent-jsWrote 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/wasmagent/wasmagent-js/claude-md)<a href="https://agentmods.dev/instructions/wasmagent/wasmagent-js/claude-md"><img src="https://agentmods.dev/badge/instructions/wasmagent/wasmagent-js/claude-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/wasmagent/wasmagent-js/claude-md"><img src="https://agentmods.dev/badge/instructions/wasmagent/wasmagent-js/claude-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 | $0.03959 | $0.03959 |
| Opus 5.5 | $0.01584 | $0.01584 |
| Sonnet 5.5 | $0.00792 | $0.00792 |
| Haiku 4.5 | $0.00396 | $0.00396 |
Grade A, and why
wasmagent-js CLAUDE.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 23d 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 — 286 lines — stays where its author put it; the contents beside it link to each section on GitHub.
wasmagent-js — Development Guide for Claude
What this project is (and is not)
Is: Verifiable evidence layer + security control plane for MCP and tool-using agents.
Three public entry points: @wasmagent/mcp-firewall (protect), @wasmagent/aep (record), @wasmagent/compliance (audit+train).
Is NOT — do not implement these:
- A general-purpose agent framework (LangChain / Mastra / AutoGen territory)
- A Cursor / Claude Code / Codex competitor (no IDE UX, no remote execution at scale)
- A compliance certification tool (never claim "satisfies EU AI Act / ISO 42001")
- A universal RAG / workflow engine
- A training framework (TRL / Axolotl territory) — we produce training data, not training code
Repository Boundaries
This runtime is one repo in a tree with sharp edges. Do not re-implement what another repo owns; call it instead.
This repository owns
- The agent runtime — kernels (QuickJS/Pyodide/Wasmtime/Remote), executor,
orchestration (
agent.run(), supervisor, subagents, handoff, teams) - MCP firewall / gateway / attestation — process-level policy enforcement
- AEP evidence emission (
@wasmagent/aep) — recording signed evidence at runtime - Model adapters, smartrouter, tools, and the developer-facing SDK surface
Other repositories own — do not duplicate here
| Capability | Owner |
|---|---|
| AEP + compliance schema definitions (ConstraintIR, task-spec, rollout-wire, etc.) | wasmagent-protocol (@wasmagent/protocol) |
| Symbolic verification engine (CEL / wazero sandbox / Z3 SMT) | symkernel (HTTP service) |
| Gateway-level HTTP evidence (Proxy-Wasm) | wasmagent-proxy |
| Training-data pipeline | trace-pipeline |
| AgentBOM / MCP Posture runtime + specifications | agentbom |
Trust Passport product/runtime (@openagentaudit/passport) |
open-agent-audit |
Allowed cross-repo patterns
- Schemas: consume
@wasmagent/protocol— never copy or inline schema JSON into this repo. Need a change? Open it againstwasmagent-protocol. - Verification: heavy symbolic checks (CEL/Z3/hard-isolation sandbox) call
symkernelover HTTP via the Criterion/ConstraintIR protocol. Keep a light inline fast path here; the authority is symkernel. - This runtime emits AEP records; it does not define their schema and does not run the verification engine.
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.
- 23d ago Changed · +16 tokens per session 90812b9c4ffa
- 1mo ago Changed · -19 lines · -181 tokens per session 3d40038021b6
- 1mo ago First seen · 305 lines · 4,124 tokens per session scan A a55f2e6b2e19
wasmagent-js CLAUDE.md is an instructions file published in the GitHub repository WasmAgent/wasmagent-js (7 stars, last pushed 12d ago), licensed Apache-2.0. It adds 3,959 tokens to every session, about $0.0158 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 2026-08-31.
Other instructions, from other repositories
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).
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.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
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.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
vscode model-prompts.instructions.md
Model-specific prompt authoring and registry guidelines.