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* feat(config): add remote_mcp field + isThinClient() helper Adds a top-level optional remote_mcp config block to GBrainConfig (issuer_url, mcp_url, oauth_client_id, oauth_client_secret) for thin-client installs that consume a remote `gbrain serve --http` over MCP instead of running a local engine. isThinClient(config) returns true when remote_mcp is set; used by the CLI dispatch guard, doctor branch, and init re-run guard. The engine field stays as today (postgres|pglite); thin-client mode is a separate config field, NOT an engine kind extension (codex outside-voice review flagged the engine='remote' extension as overreach). GBRAIN_REMOTE_CLIENT_SECRET env var overrides the config-file value at load time so the secret can stay out of disk for headless agents. Foundation commit for multi-topology v1; no behavior change yet. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * feat(probe): outbound OAuth + MCP smoke probes Adds three pure async functions over the standard fetch API: - discoverOAuth(issuerUrl): GET /.well-known/oauth-authorization-server - mintClientCredentialsToken(tokenEndpoint, id, secret): POST /token - smokeTestMcp(mcpUrl, accessToken): POST /mcp initialize Discriminated 'ok=true' / 'ok=false + reason' return shapes so callers render error messages consistently. No SDK dependency to keep init's setup-flow scope tight; Lane B's mcp-client.ts will pull in the official @modelcontextprotocol/sdk Client for full session semantics. Used by both 'gbrain init --mcp-only' (Lane A's setup smoke) and runRemoteDoctor (Lane A's thin-client doctor checks). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * feat(init): --mcp-only branch + re-run guard Adds 'gbrain init --mcp-only' for thin-client setup. Required flags (or env vars): --issuer-url OAuth root (e.g. https://host:3001) --mcp-url MCP tool dispatch path (e.g. https://host:3001/mcp) --oauth-client-id, --oauth-client-secret Pre-flight runs three smoke probes (discovery, token round-trip, MCP initialize) BEFORE writing the config — fail-fast on bad URL beats fail-late on bad credentials. On success, writes ~/.gbrain/config.json with remote_mcp set and NO local DB created. Re-run guard (A8): when ~/.gbrain/config.json already has remote_mcp, 'gbrain init' (any flag set) refuses without --force. Catches the scripted-setup-loop friction from the user-reported scenario where re-running setup-gbrain on a thin-client machine kept trying to re-create a local DB. Two URLs in config (issuer + mcp) instead of one because OAuth discovery + /token live at the issuer root while tool dispatch is at /mcp — they compose from a common base in practice but reverse-proxy setups need them explicit (codex review #2). Tests: 15 cases covering happy path, env-var-supplied secret stays out of disk, all four required-flag missing-error paths, three smoke-failure paths, network-unreachable path, and the four re-run guard variants (default/--pglite/--mcp-only without --force / with --force). Uses async Bun.spawn (NOT execFileSync) — sync exec deadlocks against in-process HTTP fixtures because the parent's event loop can't accept connections while sync-blocked on a child. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * feat(doctor): runRemoteDoctor for thin-client mode Replaces every DB-bound check from runDoctor() with a tighter set scoped to 'is the remote MCP we configured actually reachable?'. Five checks: - config_integrity (URL fields well-formed) - oauth_credentials (secret resolvable from env or config file) - oauth_discovery (GET /.well-known/oauth-authorization-server) - oauth_token (POST /token client_credentials) - mcp_smoke (POST /mcp initialize) Output shape matches the local doctor's Check surface so JSON consumers can union the two without conditional logic. schema_version is 2 (matches local doctor). collectRemoteDoctorReport() is the pure data collector; runRemoteDoctor() is the print/exit wrapper. Tests pin the data collector so we don't have to intercept stdout / process.exit. Tests: 12 cases over a tiny in-process HTTP fixture covering happy path, every probe failure mode (404/parse/auth/network/server-error), malformed-URL config integrity, missing-secret short-circuit, and the env-var-overrides-config-file secret resolution. withEnv() helper used for env mutations to satisfy the test-isolation lint. Module is added but not yet wired into the CLI doctor branch; the wiring lands in the next commit (cli dispatch guard + doctor routing). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * feat(cli): thin-client dispatch guard + doctor routing Adds a single canonical refusal at the top of handleCliOnly() for the 9 DB-bound commands when ~/.gbrain/config.json has remote_mcp set: sync, embed, extract, migrate, apply-migrations, repair-jsonb, orphans, integrity, serve Single dispatch check (not 9 sprinkled assertLocalEngine calls per codex review #1) — avoids the blast radius of letting commands enter connectEngine before the check fires. Refused commands exit 1 with a canonical error naming the remote mcp_url. doctor branch routes to runRemoteDoctor when isThinClient(config) returns true; falls through to the existing local-doctor flow otherwise. Wires the module added in the previous commit into the user-facing CLI surface. Safe commands (init, auth, --version, --help, etc.) still work in thin-client mode and are NOT in the refused set. Tests: 14 cases — 9 refused commands × 1 each, 2 safe commands, 1 doctor-routing assertion (fingerprints the thin-client output by 'mode:"thin-client"' in JSON), 2 regression tests asserting local config still passes through normally. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * docs(topologies): multi-topology architecture guide + setup skill Phase A.5 New docs/architecture/topologies.md covering three deployment shapes: 1. Single brain (today's default) 2. Cross-machine thin client (consume a remote brain over MCP) 3. Split-engine per-worktree (Conductor users with per-worktree code engines + shared remote artifacts brain) Each topology gets an ASCII diagram, when-it-fits guidance, and concrete setup recipes. Topology 3's alias-level routing footgun (wrong alias = silent wrong-brain writes) is called out explicitly per codex review #6. Topology 3 needs zero gbrain code changes — GBRAIN_HOME already overrides ~/.gbrain and 'gbrain serve --http --port N' already runs on any port. gstack composes these primitives on its side. skills/setup/SKILL.md gets Phase A.5 BEFORE the local-engine phases. Asks the user which topology fits, walks thin-client setup through 'gbrain init --mcp-only', skips Phases B/C/C.5/H entirely for thin clients (host's autopilot handles sync/extract/embed). README.md gets a one-line link to the topology doc from the Architecture section. llms-full.txt regenerated to include the new doc. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * test(e2e): thin-client end-to-end skeleton Spins up 'gbrain serve --http' against real Postgres, registers a client with read,write,admin scope, runs 'gbrain init --mcp-only' from a separate tempdir GBRAIN_HOME, exercises the canonical thin-client flows: - init --mcp-only succeeds against the live host - doctor reports mode: thin-client + all checks green - sync is refused with the canonical thin-client error - re-running init refuses without --force Tier B flows (gbrain remote ping / doctor) will be added alongside their Lane B implementation. Skips when DATABASE_URL unset (matches the e2e gate convention used across the suite). Async Bun.spawn (NOT execFileSync) so the test event loop stays responsive — execFileSync deadlocks against in-process HTTP fixtures because the parent's event loop can't accept connections while sync-blocked on a child process. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * feat(doctor): doctorReportRemote core for thin-client + run_doctor op Adds three new exports to src/commands/doctor.ts that the run_doctor MCP op + gbrain remote doctor CLI both consume: - DoctorReport interface schema_version=2 stable shape - computeDoctorReport(checks) status + health_score math - doctorReportRemote(engine) focused 5-check thin-client surface doctorReportRemote runs: 1. connection (engine reachable + page count via getStats) 2. schema_version (engine.getConfig('version') vs LATEST_VERSION) 3. brain_score (the 5-component composite) 4. sync_failures (file-plane JSONL count from gbrainPath('sync-failures.jsonl')) 5. queue_health (Postgres-only: stalled active jobs > 1h) Engine-agnostic: works on both Postgres and PGLite via engine.executeRaw + engine.getConfig + engine.getHealth — no reliance on db.getConnection() which is Postgres-only. Deliberately a focused subset of the local doctor surface, NOT a full mirror. Generalizing to lint/integrity/orphans is filed as follow-up pending demand. Local doctor (runDoctor) is unchanged; operators on the host machine still get the full check set. schema_version=2 matches the local doctor's --json output schema, so JSON consumers can union the two without conditional logic. Tests: 11 unit cases against PGLite covering the 5-check happy path, schema version reporting (latest), PGLite-specific queue_health informational message, and the score+status math via computeDoctorReport. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * feat(mcp-client): outbound HTTP MCP client over @modelcontextprotocol/sdk New src/core/mcp-client.ts wraps the official SDK's Client + StreamableHTTPClientTransport with OAuth client_credentials minting, in-process token caching with expires_at, and refresh-on-401 retry. Public surface: - callRemoteTool(config, toolName, args) tool call w/ auto-refresh - unpackToolResult(res) parse content[0].text JSON - RemoteMcpError discriminated by `reason` Token cache: module-level Map keyed by mcp_url. CLI processes are short-lived; the cache amortizes when one invocation makes multiple calls (gbrain remote ping submits then polls). Persisting to disk would be a credential-on-disk surface for marginal benefit since /token round-trip is sub-100ms. 401 retry: ONLY for mid-session token rotation (initial good token → stale → 401). If the FIRST mint fails auth, surface immediately as RemoteMcpError(auth) — retry won't help when credentials are wrong from the start. If a fresh-mint-after-401 still 401s, surface as RemoteMcpError(auth_after_refresh) which the CLI renders with a hint pointing the operator at gbrain auth register-client. Used by gbrain remote ping (submit_job + get_job poll) and gbrain remote doctor (run_doctor). Test-only _clearMcpClientTokenCache export for fixture isolation. Tests: 13 unit cases over an in-process HTTP fixture mimicking gbrain serve --http (OAuth discovery + /token + /mcp JSON-RPC handshake). Covers happy path, token cache reuse + force-refresh, args passthrough, config-error paths (no remote_mcp / no secret), token mint 401, network unreachable, tool isError envelope, and unpackToolResult parse failures. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * feat(operations): add run_doctor MCP op (admin scope, HTTP-reachable) New op in src/core/operations.ts wraps doctorReportRemote() and returns the structured DoctorReport JSON over MCP. scope: 'admin' (system-state read; not for routine consumers) localOnly: false (reachable over HTTP) mutating: false (safe to call repeatedly) params: {} (no caller arguments needed) First read-only diagnostic op exposed over HTTP MCP. Used by gbrain remote doctor — the matching client-side renderer lives in src/commands/remote.ts. Precedent: doctor only. Generalizing run_lint / run_integrity / run_orphans to MCP is filed as follow-up work pending demand. Local doctor stays unchanged; this op is the operator-friendly subset for remote callers. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * feat(remote): gbrain remote ping + gbrain remote doctor Two thin-client convenience commands that round-trip through the host's HTTP MCP endpoint: - gbrain remote ping submit_job(autopilot-cycle) → poll get_job → exit when terminal. The "I just wrote markdown, tell the host to re-index" affordance. - gbrain remote doctor run_doctor MCP op → render the host's DoctorReport → exit 0/1 based on status. Both require a thin-client install (~/.gbrain/config.json with remote_mcp). Local installs get a clear error pointing at the local equivalents. Polling backoff (ping): 1s × 30s, then 5s × 5min, then 10s. Default cap 15min, configurable via `--timeout`. Without backoff, a 5-min cycle would burn 300 round-trips against the host's rate limiter. Payload uses `data: {phases: [...]}`, NOT `params:` — the submit_job op shape takes `data`. Codex review #8 catch. NO `repo` arg passed to autopilot-cycle — uses the server's configured brain repo. This sidesteps TODO #1144 (sync_brain repo-path validation for caller-controlled paths) entirely. src/cli.ts wires the `remote` subcommand into CLI_ONLY + the dispatch. Help (`gbrain remote --help`) and unknown-subcommand handling included. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * test(e2e): thin-client Tier B + scope-mismatch regression Extends the existing test/e2e/thin-client.test.ts with three new cases: 1. gbrain remote doctor returns the host's DoctorReport — pins the run_doctor MCP op round-trip. Asserts schema_version=2, all 5 check names present, connection + schema_version ok against a fresh host. 2. gbrain remote ping triggers autopilot-cycle and returns terminal state — pins the submit_job → poll → terminal wire path. Accepts any terminal state (success / failed / dead / cancelled / timeout) because autopilot on an empty no-repo brain may fail-fast in the sync phase. What this test pins is the JSON shape (job_id present, state populated), NOT cycle success on a no-repo fixture. 3. read+write client cannot call run_doctor — codex review #7 regression guard. Registers a separate client with `--scopes "read write"` (no admin), runs `gbrain remote doctor` against it, asserts exit 1 with auth/auth_after_refresh/tool_error reason. Keeps the verification flow honest: the canonical setup MUST require admin scope. `gbrain auth register-client` doesn't have --json, so the test parses the human output for "Client ID:" and "Client Secret:" lines via a helper. Test-level timeout bumped 60s → 120s for the ping wait + auth/init overhead. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * chore: bump version and changelog (v0.29.2) v0.29.2 ships thin-client mode: gbrain init --mcp-only, gbrain remote ping/doctor, run_doctor MCP op, and the docs/architecture/topologies.md deployment guide. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>