> ## Documentation Index > Fetch the complete documentation index at: https://docs.mcpjam.com/llms.txt > Use this file to discover all available pages before exploring further. # Replace a client's servers > Replaces the client's required and optional saved-server attachments without round-tripping the whole config. Composed server-side from the client's current config, so every other setting is preserved — and `expectedConfigId` is required so two concurrent server replacements cannot silently lose one. ## OpenAPI ````yaml /reference/openapi.json post /projects/{projectId}/clients/{client}/servers openapi: 3.1.0 info: title: MCPJam API version: 1.0.0-preview description: >- Programmatic access to MCP servers saved in your MCPJam projects — live diagnostics (validate, inspect, export) and operations: call tools, render prompts, run eval suites asynchronously and poll their results, and import OAuth tokens. **The API is in preview**: the surface may change while we finish the design. Error `code` values are stable; error `message` strings are not. Write clients that ignore unknown response fields. contact: name: MCPJam url: https://github.com/MCPJam/inspector/issues servers: - url: https://app.mcpjam.com/api/v1 description: Hosted MCPJam security: - bearerAuth: [] tags: - name: Clients description: >- Clients — the named, reusable configurations that define how MCPJam connects to and talks to your MCP servers. The original `/hosts` paths remain as deprecated, ID-only compatibility aliases with their original DTOs and their original (tokenless) write contracts; every alias response carries `Deprecation: true`. New integrations should use `/clients`. - name: Environments description: >- Project environments: named, live-editable execution bundles (one host, an optional standalone server group, optionally pinned skills and plugin versions) that eval suites and journeys run against. Distinct from Sandbox images, which are Computer base images. Reads require project membership; every write requires project admin. - name: Plugins description: >- Agent Plugins imported into a project — read-only inventory and version detail. - name: Sandbox images description: >- Custom Computer images: a digest-pinned Dockerfile built into an immutable image your project's computers boot from. - name: Server diagnostics description: Connect-level health checks against a saved MCP server. - name: Primitives description: 'The server''s MCP primitives: tools, prompts, and resources.' - name: Export description: Full-server snapshots for diffing and CI. - name: Execution description: 'Run the server''s primitives: call tools, render prompts.' - name: Eval runs description: >- Asynchronous eval suite runs: create with 202, poll status, iterations, and traces. - name: Conformance runs description: >- Ingest MCP spec-conformance results from the SDK/CLI into project-owned history. Distinct from Eval runs (authored LLM cases) and from directory readiness. - name: Server connections description: >- Connect an MCP server URL to a project, authorizing in a browser when the server requires it. - name: OAuth description: 'Bring-your-own OAuth: import externally obtained tokens for a server.' - name: Scenarios description: >- Read-only access to the scenarios published from a project: listing, settings, attached servers, and share links. - name: Catalog description: >- Discover the resources the other routes operate on: your account, projects, servers, eval suites, and chat sessions. - name: Tunnels description: >- Relay tunnels that expose local MCP servers through a public URL, registered as first-class project servers (the `mcpjam cloud tunnel` CLI flow). - name: Agent description: >- Headless agent turns over the public API: send a message history, the server runs one assistant turn with project-scoped workspace tools (eval reads + suite creation) on a pinned hosted model, and returns the reply plus created-resource references. - name: Swarms description: >- Personas, journeys and swarm containers — the authoring half of Swarms — plus the model-backed generation that drafts them. - name: Swarm runs description: >- Launching journeys and reading what they produced. Launching SPENDS — see the per-operation notes. - name: Swarm insights description: >- What a swarm run revealed. The scorecard and findings are deterministic and free; requesting wave insights runs models and draws on your shared daily ledger. - name: User testing description: >- Publishing an environment for real visitors, and controlling who can reach it. Several of these NARROW access and take effect immediately. - name: Directory readiness description: >- Grade a saved server against a publisher's listing requirements: Anthropic's connector directory or OpenAI's plugin directory. Reported as lane status and coverage, never as a numeric score, and excluded from `pooledConformanceScore`. Deterministic grading is free; model-backed experience observations are an explicit opt-in that consumes MCPJam credits and can never decide a verdict. - name: Registry description: >- Search the scraped MCP directories (Claude, ChatGPT, and any future source), list curated/org registry cards, and install them into a project. Install writes a `servers` row and provenance — it does not open a live session. There is no catalog-uninstall route: delete the project server instead. Directory reads require a bearer (including minted guest tokens) but do not materialize a user. Card/connection reads and all writes are authed-non-guest. paths: /projects/{projectId}/clients/{client}/servers: post: tags: - Clients summary: Replace a client's servers description: >- Replaces the client's required and optional saved-server attachments without round-tripping the whole config. Composed server-side from the client's current config, so every other setting is preserved — and `expectedConfigId` is required so two concurrent server replacements cannot silently lose one. operationId: setClientServers parameters: - $ref: '#/components/parameters/projectId' - $ref: '#/components/parameters/client' requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/ClientServersRequest' responses: '200': description: The updated client settings. content: application/json: schema: $ref: '#/components/schemas/ClientDetail' '400': $ref: '#/components/responses/ValidationError' '401': $ref: '#/components/responses/Unauthorized' '403': $ref: '#/components/responses/Forbidden' '404': $ref: '#/components/responses/NotFound' '409': $ref: '#/components/responses/Conflict' '429': $ref: '#/components/responses/RateLimited' '500': $ref: '#/components/responses/InternalError' '502': $ref: '#/components/responses/ServerUnreachable' components: parameters: projectId: name: projectId in: path required: true description: ID of the hosted project that contains the server. schema: type: string client: name: client in: path required: true description: >- Client **name or ID**. A name is matched case-insensitively and must be unique in the project; an ambiguous name is refused with `409 CONFLICT` listing the candidate ids rather than resolved to one of them. schema: type: string schemas: ClientServersRequest: type: object description: >- Replaces the client's server attachments wholesale. Every id must name a live server in the same project. Per-server connection overrides are trimmed to the surviving selection. required: - serverIds - expectedConfigId additionalProperties: false properties: serverIds: type: array items: type: string optionalServerIds: type: array items: type: string description: Attached but not required to connect. expectedConfigId: type: string minLength: 1 description: >- The `configId` you last read for this client. ALWAYS required here: this operation rewrites the config, and without the token a write composed from a stale read silently reverts whatever landed in between. A mismatch is `409 CONFLICT` carrying `details.currentConfigId`. expectedImpact: allOf: - $ref: '#/components/schemas/ClientImpact' description: >- The `impact` you last read for this client. Optional, and checked transactionally when sent — a consumer added or removed since you read it makes the write conflict (`details.currentImpact`) instead of quietly affecting more than you were told it would. ClientDetail: type: object description: >- A client plus its resolved config (model, capabilities, host context, MCP profile) and the read-backs an editor needs. required: - id - name - config - ownerScope properties: id: type: string name: type: string configId: type: string description: The concurrency token — see `Client.configId`. config: type: object additionalProperties: true description: >- Client config v2 DTO. Opaque object; shape mirrors the inspector's client editor. ownerScope: type: - object - 'null' additionalProperties: true hasComputer: type: boolean createdAt: type: number description: Unix epoch milliseconds. updatedAt: type: number description: Unix epoch milliseconds. impact: $ref: '#/components/schemas/ClientImpact' ClientImpact: type: object description: >- What a config edit to this client would follow. These are the DURABLE consumers that re-resolve the client's current config; past runs, per-turn traces and pinned eval-suite snapshots hold a config id and are unaffected. Direct playground and client-chat use follows the edit too and has no row to count. required: - liveEnvironmentCount - scenarioAttachmentCount - activeLegacyJourneyCount properties: liveEnvironmentCount: type: integer description: Non-archived project environments selecting this client. scenarioAttachmentCount: type: integer description: Scenario attachments re-materialized inside the edit transaction. activeLegacyJourneyCount: type: integer description: Active journeys with no environments that pin this client. Error: type: object required: - code - message properties: code: type: string description: >- Stable, machine-readable error code. New codes may be added over time; treat unknown codes as non-retryable failures unless the HTTP status says otherwise. enum: - UNAUTHORIZED - FORBIDDEN - NOT_FOUND - CONFLICT - VALIDATION_ERROR - RATE_LIMITED - FEATURE_NOT_SUPPORTED - SERVER_UNREACHABLE - TIMEOUT - OAUTH_REQUIRED - INTERNAL_ERROR message: type: string description: >- Human-readable description. May change between releases — don't match on it. details: type: object description: Optional, unstructured context bag. additionalProperties: true responses: ValidationError: description: Malformed body or parameters. content: application/json: schema: $ref: '#/components/schemas/Error' example: code: VALIDATION_ERROR message: Invalid JSON body Unauthorized: description: >- Missing, invalid, revoked, or orphaned key (`UNAUTHORIZED`) — or the **target MCP server** needs an OAuth grant (`OAUTH_REQUIRED`), which is a property of the server, not your key. content: application/json: schema: $ref: '#/components/schemas/Error' examples: badKey: summary: Invalid or revoked key value: code: UNAUTHORIZED message: Invalid API key oauthRequired: summary: Target server needs an OAuth grant value: code: OAUTH_REQUIRED message: Server requires OAuth authorization Forbidden: description: Key is valid but not allowed to do this. content: application/json: schema: $ref: '#/components/schemas/Error' example: code: FORBIDDEN message: You do not have access to this project NotFound: description: Unknown project, server, or resource. content: application/json: schema: $ref: '#/components/schemas/Error' example: code: NOT_FOUND message: Server not found Conflict: description: >- The resource is not in a state that accepts this write — a stale `expectedRevision`, a duplicate name, or an environment that cannot currently be launched. The request was well-formed; re-read the resource and retry. content: application/json: schema: $ref: '#/components/schemas/Error' example: code: CONFLICT message: >- Environment changed since you loaded it (expected revision 3, current 5). Reload and retry. RateLimited: description: >- Per-key rate limit exceeded (60 requests/minute sustained, bursts up to 10). Honor `Retry-After` and back off with jitter. headers: Retry-After: description: Seconds to wait before retrying. schema: type: integer content: application/json: schema: $ref: '#/components/schemas/Error' example: code: RATE_LIMITED message: API key rate limit exceeded. Slow down and retry. InternalError: description: Something failed on MCPJam's side. content: application/json: schema: $ref: '#/components/schemas/Error' example: code: INTERNAL_ERROR message: Unexpected internal error ServerUnreachable: description: Could not connect to the target MCP server. content: application/json: schema: $ref: '#/components/schemas/Error' example: code: SERVER_UNREACHABLE message: Failed to connect to server securitySchemes: bearerAuth: type: http scheme: bearer description: >- MCPJam API key (`sk_…`). Create one at [Settings → API keys](https://app.mcpjam.com/settings/api-keys). Guest sessions cannot use the API, and API keys cannot manage other API keys. ````