Add browser console demo for cMCP#21
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A point-and-click version of the CLI demos for showing on a screen. Sends real tool calls through the gateway, shows Cedar allow/deny live, closes the session into a signed TRACE record, and runs cmcp verify offline. A small stdlib web server serves the UI and proxies to the gateway so the browser never holds the bearer token and there's no CORS to configure. Reuses the shared filesystem MCP server and the same action-dialect Cedar policy as demo-01. Catalog carries definition_hash and a schema-valid fingerprint so it loads on current cmcp-runtime. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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| return self._send(404, {"error": "not found"}) | ||
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| def _serve_static(self, rel): | ||
| target = (WEB / rel).resolve() |
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| def _serve_static(self, rel): | ||
| target = (WEB / rel).resolve() | ||
| if not str(target).startswith(str(WEB.resolve())) or not target.is_file(): |
| target = (WEB / rel).resolve() | ||
| if not str(target).startswith(str(WEB.resolve())) or not target.is_file(): | ||
| return self._send(404, "not found", "text/plain") | ||
| self._send(200, target.read_bytes(), _CT.get(target.suffix, "application/octet-stream")) |
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What
A browser-based version of the demos, for showing cMCP on a screen instead of a terminal. Lives in
web-console/.Send
write_file/read_file(Cedar permits) andlist_dir(Cedar forbids) and watch the decisions live; close the session into a signedGatewayClaim; verify it offline withcmcp verify. Every value on the page comes from the real gateway.How it works
run.pystarts the shared MCP filesystem server (:9001), the cMCP gateway (:8443,CMCP_DEV_MODE=1), and a small stdlib web server (:8000). The browser talks only to the web server, which proxies to the gateway server-side — so the bearer token stays off the browser and there's no CORS to configure. It uses the same HTTP endpoints as the CLI demos (POST /mcp,GET /audit/export,POST /sessions/{id}/close) and the same action-dialect Cedar policy asdemo-01.Verified locally end to end: allowed call returns 200 and writes the file,
list_dirreturns 403POLICY_DENY, close returns a signed claim (allowed 1 / denied 1), andcmcp verifyreportspartially_verifiedin software-only mode.Note
The catalog here carries
definition_hashand a schema-valid TLS fingerprint so it loads on the currentcmcp-runtimecatalog schema (the older demo catalogs predate that stricter validation — worth a follow-up sweep, not touched here).🤖 Generated with Claude Code