feat: add local-first MCP manager - #61
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📝 WalkthroughWalkthroughThe change adds local MCP server configuration, validation, inspection, lifecycle APIs, provider integration, configuration broadcasts, and settings UI controls. It supports stdio and HTTP transports with bot scoping and sanitized renderer-facing server data. ChangesMCP server support
Estimated code review effort: 4 (Complex) | ~45 minutes Mergeability Score: 🟠 High · up to This change adds persisted MCP registration and injects configured servers into bot turns, but the current implementation can overwrite or misroute servers, fail or resource-exhaust during health checks, and expose credentials or local details through configuration and process handling. These correctness, availability, and security risks should be fixed or explicitly accepted before merge. Suggested reviewers: Sequence Diagram(s)sequenceDiagram
participant McpManager
participant MCPAPI
participant McpRegistry
participant ConfigStore
participant ProviderTurn
participant ClaudeDriver
McpManager->>MCPAPI: create or update MCP server
MCPAPI->>McpRegistry: normalize server definition
MCPAPI->>ConfigStore: persist MCP configuration
ConfigStore-->>McpManager: broadcast sanitized configuration status
ProviderTurn->>McpRegistry: select enabled servers for bot
McpRegistry-->>ProviderTurn: return selected integrations
ProviderTurn->>ClaudeDriver: send configured MCP servers
ClaudeDriver-->>ProviderTurn: authorize MCP tool namespaces
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Actionable comments posted: 8
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Inline comments:
In `@server/drivers/claude.ts`:
- Around line 282-288: Prevent sanitized MCP identifiers from colliding in both
adapters: in server/drivers/claude.ts lines 282-288, update the key generation
before mcpServers assignment to produce a unique key or reject duplicate
generated keys; in server/drivers/acp/core.ts lines 146-150, apply the same
collision-free naming approach or reject duplicate names before sending the ACP
request. Keep naming behavior consistent across both adapters.
In `@server/mcp.ts`:
- Around line 118-121: Update the stdout data handler in the stdio inspection
flow to track received bytes and reject the inspection once a small maximum is
reached, before appending additional chunk data to buffer. Preserve normal
newline splitting and timeout behavior for output within the limit.
- Around line 47-50: Update the ID assignment in the MCP server creation/update
flow so existingId is always used when present, preventing updates from changing
routed IDs; only generate or validate an input ID for new servers. For new
servers, reject IDs that do not match the route-safe character set accepted by
the /api/mcp/servers/:id route, including values such as server.one.
- Around line 31-36: Update validRemoteUrl to include "[::1]" in the allowed
HTTP loopback hostnames, preserving the existing HTTPS and other loopback
behavior. Add a regression test confirming an HTTP URL using the bracketed IPv6
loopback host is accepted.
- Around line 69-78: Update mcpSnapshot and the associated URL normalization
flow to reject or strip URL userinfo before validation and storage, ensuring
credentials are never included in the snapshot’s url field or configuration
broadcasts. Preserve valid non-credential URL handling and keep authentication
in its separate configuration field.
- Around line 125-126: Update the initialize-success branch in the MCP
child-process flow so it writes the JSON-RPC notifications/initialized
notification before requesting tools/list. Preserve the existing initialize
response handling, and add an inspection test that verifies this message
ordering.
In `@src/components/McpManager.tsx`:
- Around line 37-55: Clear the existing error state at the start of each server
operation in update, remove, and inspect, before setting the operation busy
state or making the API request, so a later successful action cannot display a
stale error.
- Around line 33-34: Update the MCP POST/PATCH handlers and outer request
handler to avoid returning unexpected exception messages directly through the
API or McpManager renderer. Preserve fixed messages for expected inspection
failures, but map all other exceptions to the generic MCP error message before
calling the response or setError paths; use the existing MCP error-handling
symbols rather than exposing error.message.
🪄 Autofix
Fix all unresolved CodeRabbit comments on this PR:
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Configuration used: defaults
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Run ID: faf2cbb5-0e46-4baa-b140-b550d9073077
📒 Files selected for processing (12)
server/config.tsserver/contracts.tsserver/drivers/acp/core.tsserver/drivers/claude.test.tsserver/drivers/claude.tsserver/index.test.tsserver/index.tsserver/mcp.test.tsserver/mcp.tssrc/components/AppSettingsPanel.tsxsrc/components/McpManager.tsxsrc/state/store.tsx
milind-soni
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The MCP manager should not merge with the current security and protocol gaps. Stored or broadcast remote URLs can contain userinfo credentials; stdio inspection buffers unbounded child output; initialize skips the required notifications/initialized message; sanitized names can collide across servers; and updates can change routed IDs. Please fix those issues, accept bracketed IPv6 loopback safely, return generic API errors rather than raw exception messages, and add protocol, collision, output-limit, secret-redaction, and stable-ID tests.
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Addressed core MCP review findings: bracketed IPv6 loopback HTTP is accepted, stdio inspection output is bounded and sends notifications/initialized before tools/list, and configured MCP IDs now receive collision-free names in both Claude and ACP adapters. Also merged current upstream computer capability changes. Typecheck and focused MCP/ACP tests were run before this update. |
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Completed the remaining MCP renderer/API feedback: unexpected MCP write failures are now mapped to a generic server error, the renderer does not display raw exception text, and update/remove/inspect clear stale errors before a new operation. Full verification passed: pnpm typecheck, pnpm test (73 passed, 40 platform-skipped), and pnpm build. |
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Finished the last two current threads: create IDs are route-safe and update IDs immutable; remote MCP URLs with userinfo credentials are rejected before persistence/snapshots. Added coverage for bracketed IPv6, credential rejection, ID validation, and immutable updates. Verified with typecheck and server/mcp.test.ts. |
2 participants
What changed\n- Adds a persisted, local-first MCP server registry with global or per-bot assignment, enable/disable, safe add/update/remove APIs, and an App Settings manager.\n- Supports stdio MCP servers plus HTTPS or explicit loopback HTTP remote endpoints.\n- Adds bounded health inspection: stdio performs JSON-RPC initialize plus tools/list; remote endpoints receive a bounded reachability check.\n- Centrally selects enabled servers per turn and wires them into existing Claude and ACP MCP seams.\n\n## Security and architecture\n- Environment values remain in local config and never appear in API/config snapshots, renderer state, or health errors.\n- Remote URLs are restricted to HTTPS or loopback HTTP. Raw process output and remote response bodies are never surfaced.\n- The generic turn integration is capability-gated. Claude supports configured stdio and HTTP servers; ACP attaches stdio only because its baseline protocol does not guarantee remote transports. Existing Composio, computer, peer-agent, and permission-broker integrations are unchanged.\n\n## Overlap avoided\n- Does not duplicate PR #37 computer frame gating, PR #51 routines/command-palette work, or PR #43 process-tree fixes. It reuses the existing cross-platform process cleanup helper.\n\n## Verification\n- corepack pnpm typecheck\n- corepack pnpm test — 67 passed, 40 platform-gated skips\n- corepack pnpm build\n- Focused harness tests cover CRUD, safe snapshots/no secret disclosure, assignment, disabling, URL restrictions, failed inspection, and Claude turn wiring.\n- Vite UI loaded with content and no Vite error overlay. First-run onboarding intercepted a direct App Settings interaction in the isolated smoke, so the settings panel’s interaction is covered by build/type checks rather than claimed as an end-to-end click proof.\n\n## Limitations\n- The first UI form deliberately covers the lowest-risk fields (name, transport, command or URL); editing command args, environment variables, and per-bot assignment is available through the API/config schema but needs a richer dedicated editor.\n- Remote MCP tool discovery is not implemented yet; it only reports bounded endpoint reachability.\n- API-backed chat-only providers intentionally remain outside the MCP tool bridge.
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