feat(mcp): read-only Business Graph tools (nil_graph/cycles/overview/instances/activity)#58
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feat(mcp): read-only Business Graph tools (nil_graph/cycles/overview/instances/activity)#58Basheirkh wants to merge 3 commits into
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June 24, 2026 17:22
…se form is reachable The panel was hidden when zero automations existed — but the '+ New cross-system automation' button and operator-token field live inside it, so a first automation could never be created. Always render it, with an empty state.
…ing allowlist
FastMCP only honors transport_security as a constructor kwarg and otherwise
auto-enables a localhost-only allowlist, so the remote MCP 421s ('Invalid Host
header') when reached by its container/service name or a public mcp.* host
behind a reverse proxy. build_server now accepts allowed_hosts and threads a
TransportSecuritySettings; build_asgi_app reads NIL_MCP_ALLOWED_HOSTS (JSON or
comma-separated, host:* wildcard ok). /mcp stays bearer-gated.
…instances/activity) Adds deterministic brain-read tools so an agent answers 'show my policies / cycles / what changed / what's overdue' from the brain read-model instead of improvising (curl, file search) or mistaking a graph question for a missing kernel verb. BrainTools is a thin HTTP relay to the brain's /api/graph/* GET endpoints (kernel stays decoupled — it relays, never imports the brain). Env-gated by NIL_BRAIN_URL (+ NIL_BRAIN_TOKEN/TENANT); policies are surfaced as nodes via nil_graph(kind='policy'). 11 new tests; full MCP suite green. Stacks on #57 (fix/mcp-allowed-hosts).
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Why
An agent asked "show my policies" was answering inconsistently — sometimes reading the brain (correct), sometimes asking the kernel "is there a
policy.*verb?", finding none, and wrongly concluding "no policies exist." Same data, different answers by phrasing. Root cause: the NIL MCP exposed only kernel/action tools (nil_describe/propose/commit+ automations) — there was no tool to READ the Business Graph (cycles, policies, entities, instances), so the agent improvised (curl, file search) with non-deterministic results.What
Five read-only tools that relay to the brain read-model's stable
/api/graph/*GET endpoints:nil_graph(kind?)— graph nodes;kind='policy'is the deterministic "show my policies" (policies are nodes, not verbs)nil_cycles()— cycles + goal/metrics/membersnil_overview()— graph summary countsnil_instances()— live tallies incl. overdue / awaiting_approvalnil_activity()— what changed (latest diff)BrainToolsis a thin HTTP relay — the kernel stays decoupled from the brain (relays HTTP, never imports it). Env-gated byNIL_BRAIN_URL(+NIL_BRAIN_TOKEN/NIL_BRAIN_TENANT); when unset the tools simply aren't registered (no behavior change for existing deploys).Tests
11 new (
test_mcp_brain_tools.py, MockTransport): endpoint routing, tenant application,kindfiltering, error degradation, registration. Full MCP suite green (69 passed).Verified live
Deployed to wosool.ai: Hermes now discovers 17 tools, and
nil_graph(kind='policy')returns the Payment-Approval policy (count 1) — the exact query that previously returned "no policies."Stacks on #57.