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NightTrek

Ollama MCP Server

by NightTrek

serve

Start the Ollama server to enable local AI model management and integration with MCP applications.

Instructions

Start Ollama server

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Implementation Reference

  • The main handler function for the 'serve' tool. It executes the 'ollama serve' command using execAsync, captures stdout/stderr, and returns it as text content, or throws an error if failed.
    private async handleServe() {
      try {
        const { stdout, stderr } = await execAsync('ollama serve');
        return {
          content: [
            {
              type: 'text',
              text: stdout || stderr,
            },
          ],
        };
      } catch (error) {
        throw new McpError(ErrorCode.InternalError, `Failed to start Ollama server: ${formatError(error)}`);
      }
    }
  • Input schema for the 'serve' tool, which requires no parameters (empty object).
    inputSchema: {
      type: 'object',
      properties: {},
      additionalProperties: false,
    },
  • src/index.ts:67-75 (registration)
    Registration of the 'serve' tool in the ListToolsRequestSchema handler, including name, description, and schema.
    {
      name: 'serve',
      description: 'Start Ollama server',
      inputSchema: {
        type: 'object',
        properties: {},
        additionalProperties: false,
      },
    },
  • Dispatch case in the CallToolRequestSchema handler that routes 'serve' tool calls to the handleServe method.
    case 'serve':
      return await this.handleServe();
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description carries full burden but only states the action without disclosing behavioral traits. It doesn't mention whether this starts a background process, requires specific permissions, has side effects, or what happens if the server is already running, leaving significant gaps.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single, efficient sentence with zero waste. It's appropriately sized and front-loaded, directly stating the tool's purpose without any fluff or redundant information.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the complexity of starting a server (a potentially significant operation) with no annotations and no output schema, the description is incomplete. It lacks details about what the tool returns, error conditions, or operational context, making it inadequate for safe use.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The tool has 0 parameters with 100% schema description coverage, so no parameter documentation is needed. The description appropriately doesn't discuss parameters, earning a baseline score of 4 for not adding unnecessary information.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the action ('Start') and target ('Ollama server'), providing a specific verb+resource combination. However, it doesn't differentiate from sibling tools like 'run' or 'create' which might also initiate processes, missing full sibling differentiation.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides no guidance on when to use this tool versus alternatives like 'run' or 'create' from the sibling list. It lacks context about prerequisites, timing, or exclusions, offering only basic functional information.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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