A self-serve simulation lab, enabling you to build and refine long-horizon AI agents.

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SimLab is the data layer for adaptively composing RL simulations and evaluating and refining agents. SimLab is toolset, agent harness and sandbox agnostic. Browse pre-built scenario templates or bring your own CLI/MCP toolset.

• Browse & compose environments from a catalog of tool servers and scenario templates
• Run agents against tasks using any LLM provider (OpenAI, Fireworks, custom endpoints)
• Generate custom tasks with built-in task generation pipelines
• Evaluate automatically with verifiers and reward model scoring
• Scale to the cloud with Daytona for remote sandbox execution (if you want to experiment with large-scale parallel rollouts, reach out to us or join the Discord!)

Quickstart

Install

uv tool install simulationlab
# or, if you want Daytona support:
uv tool install "simulationlab[daytona]"

# pipx works too:
pipx install simulationlab

The PyPI package is named simulationlab. The installed CLI command is simlab. SimLab currently supports Python 3.13.

Get your API keys and export them:

export SIMLAB_COLLINEAR_API_KEY="col_..."   # from platform.collinear.ai (Developers > API Keys)
export DAYTONA_API_KEY="dtn_..."            # from app.daytona.io
export OPENAI_API_KEY="sk-..."              # from platform.openai.com/api-keys
export SIMLAB_VERIFIER_MODEL="gpt-5.2"      # reward model (tasks also come with a programmatic verifier so can skip this)
export SIMLAB_VERIFIER_PROVIDER="openai"    # litellm compatible provider name
export SIMLAB_VERIFIER_API_KEY="$OPENAI_API_KEY" # corresponding key

Create an environment:

# Create and start an environment on Daytona
simlab env init my-env --template hr
simlab env up my-env --daytona

To list templates run simlab templates list

Create and list tasks in directory ./generated-tasks

simlab tasks-gen init --preset recruiting # Can go to the config.toml to setup number of tasks etc.
simlab tasks list --tasks-dir ./generated-tasks # takes 5-10 mins with the default setting, choose haiku and 2 tasks for a faster generation.

Run a task with task id task_id.

simlab tasks run --env my-env \
  --task task_id \
  --tasks-dir ./generated-tasks \
  --agent-model gpt-5.2 \
  --agent-api-key "$OPENAI_API_KEY"

Tear down

simlab env down my-env --daytona

Running locally with Docker

If you have Docker + Docker Compose installed, you can run environments on your machine instead of Daytona:

simlab env init my-env --template hr
simlab env up my-env
simlab env down my-env

No DAYTONA_API_KEY required. First run may take several minutes while images are pulled/built.

For the full walkthrough — configuration, custom agents, task generation, verifiers, and more — see the Quickstart Guide.

API Keys

Key	Required	How to get it
Collinear API key	Yes	platform.collinear.ai (Developers > API Keys)
OpenAI API key	For running agents	platform.openai.com/api-keys
Daytona API key	Yes (default runtime)	app.daytona.io

Configuration

SimLab resolves configuration in this order: config file < environment variables < CLI flags.

Config file: ~/.config/simlab/config.toml (override with --config-file or SIMLAB_CONFIG)

collinear_api_key = "col_..."

[agent]
model = "gpt-5-mini"
provider = "openai"
api_key = "sk-..."

[daytona]
api_key = "dtn_..."

[verifier]
model = "claude-sonnet-4-6"
api_key = "sk-ant-..."

Environment Variables

Variable	Description
SIMLAB_COLLINEAR_API_KEY	Collinear API key
SIMLAB_AGENT_API_KEY	Agent API key
OPENAI_API_KEY	Fallback agent API key (when provider is openai)
DAYTONA_API_KEY	Daytona API key
SIMLAB_DAYTONA_API_KEY	Daytona API key (alternative)
SIMLAB_SCENARIO_MANAGER_API_URL	Override Scenario Manager API URL
SIMLAB_VERIFIER_MODEL	Verifier model
SIMLAB_VERIFIER_API_KEY	Verifier API key
SIMLAB_ENVIRONMENTS_DIR	Root directory for environments
SIMLAB_DISABLE_TELEMETRY	Set to 1 to disable CLI telemetry

CLI Reference

Command	Description
simlab env init <name>	Create a new environment (from template or interactive)
simlab env up <name>	Start environment containers (local Docker or --daytona)
simlab env down <name>	Stop and remove environment containers
simlab env seed <name>	Seed initial data into a running environment
simlab tasks list	List available tasks for an environment
simlab tasks run	Run an agent against a task and evaluate results
simlab tasks-gen init	Initialize task generation config (with presets)
simlab tasks-gen validate	Validate a task generation config
simlab tasks-gen run	Generate custom tasks via the API
simlab templates list	List available scenario templates
simlab templates info <name>	Show details for a specific template
simlab tools list	List available tool servers
simlab tools info <name>	Show details for a specific tool server

Run simlab --help for full usage details.

Documentation

• Quickstart Guide — full setup and usage walkthrough
• Docs — complete documentation
• Collinear Platform — get your API key

License

This project is licensed under the Apache 2.0 License.

Contact

Questions or feedback? Reach out to us:

• nazneen@collinear.ai
• sachin@collinear.ai
• adit@collinear.ai