Houtini LM

@houtini/lm

I built this because I kept leaving Claude Code running overnight on big refactors and the token bill was painful. A huge chunk of that spend goes on bounded tasks any decent model handles fine - generating boilerplate, explaining code, drafting commit messages, converting formats. Stuff that doesn't need Claude's reasoning or tool access.

Houtini LM connects Claude Code to a local LLM on your network. Claude keeps doing the hard work - architecture, planning, multi-file changes - and offloads the grunt work to your local model. Free. No rate limits. Private.

The session footer tracks everything Claude offloads, so you can watch the savings stack up.

How it works

Claude Code (orchestrator)
   │
   ├─ Complex reasoning, planning, architecture → Claude API (your tokens)
   │
   └─ Bounded grunt work → houtini-lm ──HTTP/SSE──> Your local LLM (free)
       • Boilerplate & test stubs          Qwen, Llama, Mistral, DeepSeek...
       • Code review & explanations        LM Studio, Ollama, vLLM, llama.cpp
       • Commit messages & docs
       • Format conversion
       • Mock data & type definitions

Claude's the architect. Your local model's the drafter. Claude QAs everything.

Quick start

Claude Code

claude mcp add houtini-lm -- npx -y @houtini/lm

That's it. If LM Studio's running on localhost:1234 (the default), Claude can start delegating straight away.

LLM on a different machine

I've got a GPU box on my local network running Qwen 3 Coder Next in LM Studio. If you've got a similar setup, point the URL at it:

claude mcp add houtini-lm -e LM_STUDIO_URL=http://192.168.1.50:1234 -- npx -y @houtini/lm

Claude Desktop

Drop this into your claude_desktop_config.json:

{
  "mcpServers": {
    "houtini-lm": {
      "command": "npx",
      "args": ["-y", "@houtini/lm"],
      "env": {
        "LM_STUDIO_URL": "http://localhost:1234"
      }
    }
  }
}

What gets offloaded

Delegate to the local model - bounded, well-defined tasks:

Task	Why it works locally
Generate test stubs	Clear input (source), clear output (tests)
Explain a function	Summarisation doesn't need tool access
Draft commit messages	Diff in, message out
Code review	Paste full source, ask for bugs
Convert formats	JSON↔YAML, snake_case↔camelCase
Generate mock data	Schema in, data out
Write type definitions	Source in, types out
Brainstorm approaches	Doesn't commit to anything

Keep on Claude - anything that needs reasoning, tool access, or multi-step orchestration:

• Architectural decisions
• Reading/writing files
• Running tests and interpreting results
• Multi-file refactoring plans
• Anything that needs to call other tools

The tool descriptions are written to nudge Claude into planning delegation at the start of large tasks, not just using it when it happens to think of it.

Token tracking

Every response includes a session footer:

Model: qwen/qwen3-coder-next | This call: 145→248 tokens | Session: 12,450 tokens offloaded across 23 calls

The discover tool reports cumulative session stats too. Claude sees this data and (I've found) it reinforces the delegation habit throughout long-running tasks. The more it sees it's saving tokens, the more it looks for things to offload.

Tools

chat

The workhorse. Send a task, get an answer. The description includes planning triggers that nudge Claude to identify offloadable work when it's starting a big task.

Parameter	Required	Default	What it does
message	yes	-	The task. Be specific about output format.
system	no	-	Persona - "Senior TypeScript dev" not "helpful assistant"
temperature	no	0.3	0.1 for code, 0.3 for analysis, 0.7 for creative
max_tokens	no	2048	Lower for quick answers, higher for generation

custom_prompt

Three-part prompt: system, context, instruction. Keeping them separate prevents context bleed - consistently outperforms stuffing everything into one message, especially with local models.

Parameter	Required	Default	What it does
instruction	yes	-	What to produce. Under 50 words works best.
system	no	-	Persona + constraints, under 30 words
context	no	-	Complete data to analyse. Never truncate.
temperature	no	0.3	0.1 for review, 0.3 for analysis
max_tokens	no	2048	Match to expected output length

code_task

Built for code analysis. Pre-configured system prompt, locked to temperature 0.2 for focused output.

Parameter	Required	Default	What it does
code	yes	-	Complete source code. Never truncate.
task	yes	-	"Find bugs", "Explain this", "Write tests"
language	no	-	"typescript", "python", "rust", etc.
max_tokens	no	2048	Match to expected output length

discover

Health check. Returns model name, context window, latency, and cumulative session stats. Call before delegating if you're not sure the LLM's available.

list_models

Lists everything loaded on the LLM server with context window sizes.

Getting good results from local models

Qwen, Llama, DeepSeek - they score brilliantly on coding benchmarks now. The gap between a good and bad result is almost always prompt quality, not model capability. I've spent a fair bit of time on this.

Send complete code. Local models hallucinate details when you give them truncated input. If a file's too large, send the relevant function - not a snippet with ... in the middle.

Be explicit about output format. "Return a JSON array" or "respond in bullet points" - don't leave it open-ended. Smaller models need this.

Set a specific persona. "Expert Rust developer who cares about memory safety" gets noticeably better results than "helpful assistant."

State constraints. "No preamble", "reference line numbers", "max 5 bullet points" - tell the model what not to do as well as what to do.

Include surrounding context. For code generation, send imports, types, and function signatures - not just the function body.

One call at a time. If your LLM server runs a single model, parallel calls queue up and stack timeouts. Send them sequentially.

Configuration

Variable	Default	What it does
LM_STUDIO_URL	http://localhost:1234	Base URL of the OpenAI-compatible API
LM_STUDIO_MODEL	(auto-detect)	Model identifier - leave blank to use whatever's loaded
LM_STUDIO_PASSWORD	(none)	Bearer token for authenticated endpoints
LM_CONTEXT_WINDOW	100000	Fallback context window if the API doesn't report it

Compatible endpoints

Works with anything that speaks the OpenAI /v1/chat/completions API:

What	URL	Notes
LM Studio	http://localhost:1234	Default, zero config
Ollama	http://localhost:11434	Set LM_STUDIO_URL
vLLM	http://localhost:8000	Native OpenAI API
llama.cpp	http://localhost:8080	Server mode
Any OpenAI-compatible API	Any URL	Set URL + password

Streaming and timeouts

All inference uses Server-Sent Events streaming. Tokens arrive incrementally, keeping the connection alive. If generation takes longer than 55 seconds, you get a partial result instead of a timeout error - the footer shows ⚠ TRUNCATED when this happens.

The 55-second soft timeout exists because the MCP SDK has a hard ~60s client-side timeout. Without streaming, any response that took longer than 60 seconds just vanished. Not ideal.

Development

git clone https://github.com/houtini-ai/lm.git
cd lm
npm install
npm run build

Licence

MIT