feat(serve): identity-scoped stack MCP server over HTTP (stack#7)#20
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`agentkit serve --identity <id>` exposes a running stack to LLM clients over MCP (Streamable-HTTP), bound to a single minted identity — NOT a universal gateway proxy (the gateway-parity anti-goal). Sequences after #9 (identity), stack#3 (audit), #10 (MCP wrapper). Identity-scoping is enforced two ways: - src/mcp/stack-tools.ts loadServingIdentity(): the server refuses to start unless it holds the identity's private key (present + matches), so it can only act AS that identity. - every tool result is stamped `servedBy {id, fingerprint}`. The tool set is deliberately read/verify-scoped: identity_whoami, status, audit_verify, evidence_export — no mint/init/scaffold (those aren't "interact with the running stack" and would broaden the surface). Reuses the existing command functions. - src/mcp/stack-server.ts: runStackMcpServer() serves the scoped tools over the SDK's StreamableHTTPServerTransport (stateless: fresh transport+server per request, no cross-identity session state). SDK + node:http via dynamic import (ESM-from-CJS). Returns {port, close} for clean lifecycle/testing. - cli.ts: `agentkit serve` (--identity required, --port, --store). Tests: 8 — scoped tool set (only read/verify), whoami, servedBy stamping, loadServingIdentity (loads valid / throws missing / refuses key-absent), runStackMcpServer (starts on a usable identity + 404s non-/mcp + closes / refuses without identity). Plus a live MCP-over-HTTP smoke (tools/list → the 4 scoped tools). Full suite 81 green. Closes agentkitai/agentkit-stack#7. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_019tXZpN29akdmG8AEjgSZwk
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Closes agentkitai/agentkit-stack#7.
agentkit serve --identity <id>exposes a running stack to LLM clients over MCP (Streamable-HTTP), bound to a single minted identity — not a universal gateway proxy (the gateway-parity anti-goal). Sequences after #9/stack#3/#10.Identity-scoping enforced two ways:
loadServingIdentity()— the server refuses to start unless it holds the identity's private key (present + matches), so it can only act AS that identity.servedBy {id, fingerprint}.Read/verify-scoped tool set:
identity_whoami,status,audit_verify,evidence_export— no mint/init/scaffold (those broaden the surface beyond stack-interaction).runStackMcpServer()serves over the SDK'sStreamableHTTPServerTransport(stateless — fresh transport+server per request, no cross-identity session state). SDK + node:http via dynamic import. Returns{port, close}.Tests: 8 (scoped tool set, whoami, servedBy stamp, loadServingIdentity load/missing/key-absent, server start+404+close / refuse-without-identity) + a live MCP-over-HTTP smoke (
tools/list→ the 4 scoped tools). Full suite 81.