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wasmagent-js

WasmAgent adds a verifiable evidence layer to agent tool use: protect tool calls, record what happened, audit the result, and admit trusted traces into downstream systems.

Protect → Record → Audit → Admit · Sync — agent↔UI shared state

Start in 30 seconds

Pick your entry point:

Trust Pack — 30-minute end-to-end: docs/quickstarts/trust-pack-30min.md

Quickstart

Three paths — pick the one that fits your use case:

Path 1 — Protect: MCP runtime firewall

Wrap any MCP server: vet tools before execution, enforce policy per call, track taint across results.

npm install @wasmagent/mcp-firewall

import { evaluatePolicy, snapshotTool, taintObservation, vetTool } from "@wasmagent/mcp-firewall";

const entry = {
  name: "read_file",
  description: "Read a file from disk",
  inputSchema: { type: "object", properties: { path: { type: "string" } } },
};
const args = { path: "/tmp/report.txt" };
const consentRecords = [];

// Before calling a tool
const snap     = snapshotTool(entry, "my-server");   // hash descriptor at registration
const vetting  = vetTool(entry);                     // static scan: injection / exfil / rug-pull
const decision = evaluatePolicy(entry.name, args, vetting, consentRecords);

if (decision.decision === "deny")   throw new Error(`Blocked: ${decision.reasons.join("; ")}`);
if (decision.decision === "ask_user") {
  // surface consent UI, then call recordConsent(...)
}

// After receiving result
const rawResult = "example report contents";
const obs = taintObservation(entry.name, rawResult);  // boundary-tagged, safe to assemble into prompt

→ Security pack · OWASP Agentic Top 10 · Attack demos

Path 2 — Record: AEP evidence export

Emit a signed evidence record after every agent run — consumable by trace-pipeline for audit and training.

npm install @wasmagent/aep

import { AEPEmitter } from "@wasmagent/aep";

const emitter = new AEPEmitter({ run_id: "run-001", model_id: "claude-sonnet-4-6" });

// During the run — add tool call evidence
emitter.addAction({ tool_name: "bash", outcome: "pass", exit_code: 0 });

// At the end — emit the record
const record = emitter.build();
// record satisfies aep/v0.3 JSON Schema — ready for evomerge validate-aep

→ AEP schema · trace-pipeline 10-min tutorial

Path 3 — Execute: Sandboxed code execution

Shortened. The full README is on GitHub.