From 3996e2f1992b8292fac46190de6a25f361056d8c Mon Sep 17 00:00:00 2001 From: Fadhli Azhari Date: Wed, 25 Mar 2026 16:46:19 +0800 Subject: [PATCH] feat: initial Ollama MCP server TypeScript MCP server wrapping the Ollama REST API. Provides tools for: - Text generation and multi-turn chat - Model management (list, show, pull, delete) - Health check and running model status - Embeddings generation Co-Authored-By: Claude Opus 4.6 (1M context) --- .gitignore | 3 + package.json | 21 + pnpm-lock.yaml | 1106 +++++++++++++++++++++++++++++++++++++++++++++++ src/client.ts | 174 ++++++++ src/handlers.ts | 97 +++++ src/index.ts | 63 +++ src/tools.ts | 121 ++++++ tsconfig.json | 14 + 8 files changed, 1599 insertions(+) create mode 100644 .gitignore create mode 100644 package.json create mode 100644 pnpm-lock.yaml create mode 100644 src/client.ts create mode 100644 src/handlers.ts create mode 100644 src/index.ts create mode 100644 src/tools.ts create mode 100644 tsconfig.json diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..deed335 --- /dev/null +++ b/.gitignore @@ -0,0 +1,3 @@ +node_modules/ +dist/ +.env diff --git a/package.json b/package.json new file mode 100644 index 0000000..41ceb05 --- /dev/null +++ b/package.json @@ -0,0 +1,21 @@ +{ + "name": "@kollect/ollama-mcp", + "version": "0.1.0", + "description": "MCP server for Ollama local LLM integration", + "type": "module", + "main": "dist/index.js", + "scripts": { + "build": "tsc", + "start": "node dist/index.js", + "dev": "tsx src/index.ts" + }, + "dependencies": { + "@modelcontextprotocol/sdk": "^1.12.1", + "zod": "^4.3.6" + }, + "devDependencies": { + "@types/node": "^22.0.0", + "tsx": "^4.19.0", + "typescript": "^5.7.0" + } +} diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml new file mode 100644 index 0000000..c8481a6 --- /dev/null +++ b/pnpm-lock.yaml @@ -0,0 +1,1106 @@ +lockfileVersion: '9.0' + +settings: + autoInstallPeers: true + excludeLinksFromLockfile: false + +importers: + + .: + dependencies: + '@modelcontextprotocol/sdk': + specifier: ^1.12.1 + version: 1.27.1(zod@4.3.6) + zod: + specifier: ^4.3.6 + version: 4.3.6 + devDependencies: + '@types/node': + specifier: ^22.0.0 + version: 22.19.15 + tsx: + specifier: ^4.19.0 + 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3.0.2 + + typescript@5.9.3: {} + + undici-types@6.21.0: {} + + unpipe@1.0.0: {} + + vary@1.1.2: {} + + which@2.0.2: + dependencies: + isexe: 2.0.0 + + wrappy@1.0.2: {} + + zod-to-json-schema@3.25.1(zod@4.3.6): + dependencies: + zod: 4.3.6 + + zod@4.3.6: {} diff --git a/src/client.ts b/src/client.ts new file mode 100644 index 0000000..ae46314 --- /dev/null +++ b/src/client.ts @@ -0,0 +1,174 @@ +/** + * Ollama HTTP API client. + * + * Wraps the Ollama REST API (default http://127.0.0.1:11434). + * Docs: https://github.com/ollama/ollama/blob/main/docs/api.md + */ + +export interface OllamaConfig { + host: string; +} + +export interface GenerateRequest { + model: string; + prompt: string; + system?: string; + temperature?: number; + max_tokens?: number; + format?: "json"; +} + +export interface ChatMessage { + role: "system" | "user" | "assistant"; + content: string; +} + +export interface ChatRequest { + model: string; + messages: ChatMessage[]; + temperature?: number; + max_tokens?: number; + format?: "json"; +} + +export interface ModelInfo { + name: string; + model: string; + size: number; + details: { + parameter_size: string; + quantization_level: string; + family: string; + }; +} + +export interface PullProgress { + status: string; + digest?: string; + total?: number; + completed?: number; +} + +export class OllamaClient { + private host: string; + + constructor(config: OllamaConfig) { + this.host = config.host.replace(/\/+$/, ""); + } + + private async request(path: string, options?: RequestInit): Promise { + const url = `${this.host}${path}`; + const res = await fetch(url, options); + if (!res.ok) { + const body = await res.text().catch(() => ""); + throw new Error(`Ollama API ${res.status}: ${body || res.statusText}`); + } + return res; + } + + /** Generate a completion (non-streaming). */ + async generate(req: GenerateRequest): Promise { + const body: Record = { + model: req.model, + prompt: req.prompt, + stream: false, + }; + if (req.system) body.system = req.system; + if (req.temperature !== undefined) body.temperature = req.temperature; + if (req.max_tokens !== undefined) body.options = { num_predict: req.max_tokens }; + if (req.format) body.format = req.format; + + const res = await this.request("/api/generate", { + method: "POST", + headers: { "Content-Type": "application/json" }, + body: JSON.stringify(body), + }); + const data = await res.json() as { response: string }; + return data.response; + } + + /** Multi-turn chat completion (non-streaming). */ + async chat(req: ChatRequest): Promise { + const body: Record = { + model: req.model, + messages: req.messages, + stream: false, + }; + if (req.temperature !== undefined) body.temperature = req.temperature; + if (req.max_tokens !== undefined) body.options = { num_predict: req.max_tokens }; + if (req.format) body.format = req.format; + + const res = await this.request("/api/chat", { + method: "POST", + headers: { "Content-Type": "application/json" }, + body: JSON.stringify(body), + }); + const data = await res.json() as { message: { content: string } }; + return data.message.content; + } + + /** List locally available models. */ + async listModels(): Promise { + const res = await this.request("/api/tags"); + const data = await res.json() as { models: ModelInfo[] }; + return data.models; + } + + /** Get detailed info about a model. */ + async showModel(name: string): Promise> { + const res = await this.request("/api/show", { + method: "POST", + headers: { "Content-Type": "application/json" }, + body: JSON.stringify({ name }), + }); + return await res.json() as Record; + } + + /** Pull a model (blocking — waits for completion). */ + async pullModel(name: string): Promise { + const res = await this.request("/api/pull", { + method: "POST", + headers: { "Content-Type": "application/json" }, + body: JSON.stringify({ name, stream: false }), + }); + const data = await res.json() as { status: string }; + return data.status; + } + + /** Delete a model. */ + async deleteModel(name: string): Promise { + await this.request("/api/delete", { + method: "DELETE", + headers: { "Content-Type": "application/json" }, + body: JSON.stringify({ name }), + }); + } + + /** Check if Ollama is reachable. */ + async health(): Promise { + try { + await this.request("/"); + return true; + } catch { + return false; + } + } + + /** List running models. */ + async listRunning(): Promise { + const res = await this.request("/api/ps"); + const data = await res.json() as { models: unknown[] }; + return data.models ?? []; + } + + /** Generate embeddings. */ + async embed(model: string, input: string | string[]): Promise { + const res = await this.request("/api/embed", { + method: "POST", + headers: { "Content-Type": "application/json" }, + body: JSON.stringify({ model, input }), + }); + const data = await res.json() as { embeddings: number[][] }; + return data.embeddings; + } +} diff --git a/src/handlers.ts b/src/handlers.ts new file mode 100644 index 0000000..a835190 --- /dev/null +++ b/src/handlers.ts @@ -0,0 +1,97 @@ +/** + * Tool handler implementations for Ollama MCP server. + */ + +import type { OllamaClient, ChatMessage } from "./client.js"; + +function formatBytes(bytes: number): string { + if (bytes < 1024 * 1024) return `${(bytes / 1024).toFixed(0)} KB`; + if (bytes < 1024 * 1024 * 1024) return `${(bytes / (1024 * 1024)).toFixed(1)} MB`; + return `${(bytes / (1024 * 1024 * 1024)).toFixed(2)} GB`; +} + +export function createHandlers(client: OllamaClient) { + return { + ollama_generate: async (args: { + model: string; + prompt: string; + system?: string; + temperature?: number; + max_tokens?: number; + format?: "json"; + }) => { + return await client.generate(args); + }, + + ollama_chat: async (args: { + model: string; + messages: ChatMessage[]; + temperature?: number; + max_tokens?: number; + format?: "json"; + }) => { + return await client.chat(args); + }, + + ollama_list_models: async () => { + const models = await client.listModels(); + if (models.length === 0) return "No models installed. Use ollama_pull_model to download one."; + + return models + .map( + (m) => + `- ${m.name} (${formatBytes(m.size)}, ${m.details.parameter_size}, ${m.details.quantization_level}, family: ${m.details.family})`, + ) + .join("\n"); + }, + + ollama_show_model: async (args: { name: string }) => { + const info = await client.showModel(args.name); + // Return a readable subset — full response can be huge (includes template, license) + const details = info.details as Record | undefined; + const params = info.model_info as Record | undefined; + const lines = [`Model: ${args.name}`]; + if (details) { + lines.push(`Family: ${details.family ?? "unknown"}`); + lines.push(`Parameters: ${details.parameter_size ?? "unknown"}`); + lines.push(`Quantization: ${details.quantization_level ?? "unknown"}`); + lines.push(`Format: ${details.format ?? "unknown"}`); + } + if (info.template) lines.push(`Template: (${(info.template as string).length} chars)`); + if (info.license) lines.push(`License: (${(info.license as string).length} chars)`); + if (params) { + const paramKeys = Object.keys(params).slice(0, 10); + lines.push(`Model info keys: ${paramKeys.join(", ")}${Object.keys(params).length > 10 ? "..." : ""}`); + } + return lines.join("\n"); + }, + + ollama_pull_model: async (args: { name: string }) => { + const status = await client.pullModel(args.name); + return `Pull complete: ${args.name} — ${status}`; + }, + + ollama_delete_model: async (args: { name: string }) => { + await client.deleteModel(args.name); + return `Deleted: ${args.name}`; + }, + + ollama_health: async () => { + const ok = await client.health(); + return ok ? "Ollama is running and reachable." : "Ollama is not reachable."; + }, + + ollama_list_running: async () => { + const models = await client.listRunning(); + if (models.length === 0) return "No models currently loaded in memory."; + return JSON.stringify(models, null, 2); + }, + + ollama_embed: async (args: { model: string; input: string | string[] }) => { + const embeddings = await client.embed(args.model, args.input); + const count = embeddings.length; + const dim = embeddings[0]?.length ?? 0; + return `Generated ${count} embedding(s), dimension: ${dim}\n\n${JSON.stringify(embeddings)}`; + }, + }; +} diff --git a/src/index.ts b/src/index.ts new file mode 100644 index 0000000..9de2597 --- /dev/null +++ b/src/index.ts @@ -0,0 +1,63 @@ +#!/usr/bin/env node +/** + * Ollama MCP Server + * + * Connects AI assistants to a local Ollama instance for LLM inference, + * model management, and embeddings. + * + * Environment variables: + * OLLAMA_HOST — Base URL of the Ollama server (default: http://127.0.0.1:11434) + */ + +import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js"; +import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js"; +import { OllamaClient } from "./client.js"; +import { toolDefs } from "./tools.js"; +import { createHandlers } from "./handlers.js"; + +const host = process.env.OLLAMA_HOST ?? "http://127.0.0.1:11434"; + +const client = new OllamaClient({ host }); +const handlers = createHandlers(client); + +const server = new McpServer({ + name: "ollama", + version: "0.1.0", +}); + +// Register each tool from toolDefs with its corresponding handler. +for (const [name, def] of Object.entries(toolDefs)) { + const handler = handlers[name as keyof typeof handlers]; + if (!handler) { + console.error(`No handler for tool: ${name}`); + continue; + } + + server.tool( + name, + def.description, + def.inputSchema, + async (args: any) => { + try { + const result = await (handler as Function)(args); + return { content: [{ type: "text" as const, text: String(result) }] }; + } catch (err: any) { + return { + content: [{ type: "text" as const, text: `Error: ${err.message}` }], + isError: true, + }; + } + }, + ); +} + +async function main() { + const transport = new StdioServerTransport(); + await server.connect(transport); + console.error(`Ollama MCP server running on stdio (host: ${host})`); +} + +main().catch((err) => { + console.error("Fatal error:", err); + process.exit(1); +}); diff --git a/src/tools.ts b/src/tools.ts new file mode 100644 index 0000000..a9ba630 --- /dev/null +++ b/src/tools.ts @@ -0,0 +1,121 @@ +/** + * MCP tool definitions for Ollama. + * + * Each tool has a description and a Zod input schema. + */ + +import { z } from "zod"; + +export const toolDefs = { + // ── Generation ── + ollama_generate: { + description: + "Generate a text completion using a local Ollama model. Use for code generation, review, explanation, or any text task.", + inputSchema: { + model: z.string().describe("Model name (e.g. qwen2.5-coder:7b)"), + prompt: z.string().describe("The prompt to send to the model"), + system: z + .string() + .optional() + .describe("System prompt to set context/persona"), + temperature: z + .number() + .min(0) + .max(2) + .optional() + .describe("Sampling temperature (0=deterministic, default ~0.7)"), + max_tokens: z + .number() + .int() + .positive() + .optional() + .describe("Maximum tokens to generate"), + format: z + .enum(["json"]) + .optional() + .describe("Set to 'json' to force JSON output"), + }, + }, + + ollama_chat: { + description: + "Multi-turn chat with a local Ollama model. Send a conversation history for context-aware responses.", + inputSchema: { + model: z.string().describe("Model name (e.g. qwen2.5-coder:7b)"), + messages: z + .array( + z.object({ + role: z.enum(["system", "user", "assistant"]), + content: z.string(), + }), + ) + .describe("Conversation messages array"), + temperature: z + .number() + .min(0) + .max(2) + .optional() + .describe("Sampling temperature"), + max_tokens: z + .number() + .int() + .positive() + .optional() + .describe("Maximum tokens to generate"), + format: z + .enum(["json"]) + .optional() + .describe("Set to 'json' to force JSON output"), + }, + }, + + // ── Model Management ── + ollama_list_models: { + description: "List all locally available Ollama models with size and quantization details.", + inputSchema: {}, + }, + + ollama_show_model: { + description: "Get detailed information about a specific model (parameters, template, license).", + inputSchema: { + name: z.string().describe("Model name (e.g. qwen2.5-coder:7b)"), + }, + }, + + ollama_pull_model: { + description: "Download a model from the Ollama registry. Blocks until complete.", + inputSchema: { + name: z.string().describe("Model name to pull (e.g. qwen2.5-coder:7b)"), + }, + }, + + ollama_delete_model: { + description: "Delete a locally downloaded model to free disk space.", + inputSchema: { + name: z.string().describe("Model name to delete"), + }, + }, + + // ── Status ── + ollama_health: { + description: "Check if the Ollama server is running and reachable.", + inputSchema: {}, + }, + + ollama_list_running: { + description: "List currently loaded/running models in memory.", + inputSchema: {}, + }, + + // ── Embeddings ── + ollama_embed: { + description: + "Generate embeddings for text using a local model. Useful for semantic search and similarity.", + inputSchema: { + model: z.string().describe("Model name for embeddings"), + input: z + .union([z.string(), z.array(z.string())]) + .describe("Text or array of texts to embed"), + }, + }, +} as const; diff --git a/tsconfig.json b/tsconfig.json new file mode 100644 index 0000000..3650c4f --- /dev/null +++ b/tsconfig.json @@ -0,0 +1,14 @@ +{ + "compilerOptions": { + "target": "ES2022", + "module": "Node16", + "moduleResolution": "Node16", + "outDir": "dist", + "rootDir": "src", + "strict": true, + "esModuleInterop": true, + "skipLibCheck": true, + "declaration": true + }, + "include": ["src/**/*"] +}