deepseek-ai/deepseek-harness · error · Error

client api: ${kind} method ${endpointOf(descriptor)} is alre

Error message

client api: ${kind} method ${endpointOf(descriptor)} is already mounted

What it means

Error "client api: ${kind} method ${endpointOf(descriptor)} is already mounted" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/api/gateway/src/client/index.ts:226

  }

  private validateContribution(contribution: TypertRemoteContribution): void {
    const direct = new Map<string, Set<string>>()
    const scoped = new Map<string, Set<string>>()
    const add = (
      table: Map<string, Set<string>>,
      descriptor: InvocationDescriptor,
      kind: 'direct' | 'scoped',
    ): void => {
      const methods = table.get(descriptor.namespace) ?? new Set<string>()
      if (methods.has(descriptor.method)) {
        throw new Error(`client api: contribution repeats ${kind} method ${endpointOf(descriptor)}`)
      }
      methods.add(descriptor.method)
      table.set(descriptor.namespace, methods)
      const namespace = this.namespaces.get(descriptor.namespace)?.service
      if (namespace?.has(kind, descriptor.method) === true) {
        throw new Error(`client api: ${kind} method ${endpointOf(descriptor)} is already mounted`)
      }
    }
    for (const descriptor of contribution.descriptors) {
      requireStrictDescriptor(descriptor)
      if (descriptor.invocation.kind === 'direct') add(direct, descriptor, 'direct')
      if (scopedProjection(descriptor) !== undefined) add(scoped, descriptor, 'scoped')
    }
    const namespaces = new Set([...direct.keys(), ...scoped.keys()])
    for (const namespace of namespaces) {
      const service = this.namespaces.get(namespace)?.service
      if (service === undefined) {
        if (namespace in this) {
          throw new Error(`client api: namespace ${JSON.stringify(namespace)} conflicts with the Remote service`)
        }
        const serviceKey = remoteServiceKey(namespace)
        const property = this.ownerCtx.reflect.props[serviceKey]
        if (property?.type === 'accessor' || this.ownerCtx.get(serviceKey) !== undefined) {
          throw new Error(`client api: namespace ${JSON.stringify(namespace)} conflicts with an existing Remote namespace`)

View on GitHub (pinned to b150a551b8)

Solutions

1. Unmount the existing method before remounting, or choose a different endpoint name.

When it happens

Trigger: Thrown at packages/api/gateway/src/client/index.ts:226 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of deepseek-ai/deepseek-harness@b150a551b8 (2026-08-24). Data as JSON: /api/errors/735b541ff58628ac. Report an issue: GitHub.