llm-connect

Pluggable LLM adapters for Python and the commandline. Supports OpenRouter, Gemini, OpenAI, and the Claude Code CLI out of the box, with a clean abstract interface for adding your own.

Quick start

from llm_connect import create_adapter, RunConfig

adapter = create_adapter("gemini", model="gemini-2.5-flash")
config = RunConfig(temperature=0.7, max_tokens=1000)
response = adapter.execute_prompt("Summarise the value chain concept.", config)
print(response.content)

Installation

pip install -e /path/to/llm-connect     # local editable install
# or, once published:
pip install llm-connect

Requires: Python 3.10+, toml

Providers

Provider key	Class	Notes
"openrouter"	OpenRouterAdapter	OpenAI-compatible endpoint; supports all OpenRouter models
"gemini"	GeminiAdapter	Google Generative Language REST API; supports free tier

from llm_connect import create_adapter

# OpenRouter
adapter = create_adapter("openrouter", model="anthropic/claude-sonnet-4")

# Gemini (uses GEMINI_API_KEY env var or apikey-geminifree.txt)
adapter = create_adapter("gemini", model="gemini-2.5-flash")

# OpenAI (uses OPENAI_API_KEY env var)
adapter = create_adapter("openai", model="gpt-4.1-mini")

# Claude Code CLI (uses locally installed claude binary)
adapter = create_adapter("claude-code")

API keys

Keys are resolved in this order (first found wins):

1. Explicit api_key argument to the constructor
2. Environment variable (e.g. OPENROUTER_API_KEY, GEMINI_API_KEY, OPENAI_API_KEY)
3. Key file in the project root (e.g. apikey-openrouter.txt, apikey-geminifree.txt)

Core types

RunConfig

Controls a single LLM call.

from llm_connect import RunConfig

config = RunConfig(
    model_name="gemini-2.5-flash",  # overrides adapter default
    temperature=0.3,
    max_tokens=2000,
    timeout_seconds=60,
)

Field	Default	Description
model_name	"gpt-4"	Model identifier (adapter may override)
temperature	0.7	Sampling temperature
max_tokens	2000	Maximum output tokens
model_params	{}	Portable extras translated by each adapter; see docs/adapter-model-params.md
max_depth	3	Max nesting depth for recursive calls
skip_if_exists	True	Skip if identical input hash already processed
timeout_seconds	300	Request timeout

LLMResponse

Returned by every execute_prompt call.

response = adapter.execute_prompt(prompt, config)
print(response.content)       # generated text
print(response.model)         # model actually used
print(response.usage)         # {"prompt_tokens": …, "completion_tokens": …, "total_tokens": …}
print(response.finish_reason) # "stop", "length", etc.

Server diagnostics

Serve mode can include a debug envelope without changing normal responses:

LLM_CONNECT_DEBUG=1 python -m llm_connect.server --provider openrouter
curl 'http://127.0.0.1:8080/execute?debug=1' -d '{"prompt":"hi"}'

Set LLM_CONNECT_AUDIT_DIR=/path/to/audit to write per-call replay records, then parse one without another provider call:

python -m llm_connect.replay /path/to/audit/record.json --json

Writing your own adapter

from llm_connect import LLMAdapter, RunConfig, LLMResponse

class MyAdapter(LLMAdapter):
    def execute_prompt(self, prompt: str, config: RunConfig) -> LLMResponse:
        # call your API here
        return LLMResponse(content="...", model="my-model")

    def validate_config(self, config: RunConfig) -> bool:
        return True

TOML configuration chain

The resolve_llm() function walks a 7-level priority chain to pick a provider and model. This is used by the llm-helper integration but is also available standalone:

from llm_connect.toml_config import resolve_llm

resolved = resolve_llm(app_name="myapp")
print(resolved.provider, resolved.model, resolved.provider_source)

Priority order (highest first):

1. CLI flags (cli_provider, cli_model arguments)
2. Env var {APP_NAME}_HELPER_MODEL (model only)
3. User preference — ~/.config/{app_name}/config.toml [llm.preference]
4. Directory preference — .{app_name}.toml [llm.preference]
5. Directory default — .{app_name}.toml [llm.default]
6. User default — ~/.config/{app_name}/config.toml [llm.default]
7. Hardcoded fallback — gemini / gemini-2.5-flash

Example config file (~/.config/myapp/config.toml):

[llm.default]
provider = "gemini"
model = "gemini-2.5-flash"

[llm.preference]
provider = "openrouter"
model = "anthropic/claude-sonnet-4"

Embeddings

from llm_connect import create_embedding_adapter, EmbeddingCache

adapter = create_embedding_adapter("openai", model="text-embedding-3-small")
cache = EmbeddingCache(cache_dir=".embeddings")

# Get embedding (cached after first call)
vec = cache.get_or_compute("my text", lambda t: adapter.embed([t])[0])

Exceptions

from llm_connect.exceptions import (
    LLMError,             # base
    LLMConfigurationError,# bad key, unknown provider
    LLMAPIError,          # HTTP error from provider (has .status_code)
    LLMRateLimitError,    # 429
    LLMTimeoutError,      # request timed out
    LLMSubprocessError,   # claude CLI failed (has .return_code, .stderr)
)

Testing

from llm_connect import MockLLMAdapter, RunConfig

mock = MockLLMAdapter(mock_response="Test response")
config = RunConfig()
response = mock.execute_prompt("any prompt", config)
assert response.content == "Test response"
assert mock.call_count == 1

Origin

Extracted from the markitect project. The markitect.llm module remains a re-export shim pointing here.