run-keystone

name	run-keystone
description	How to install and run the Keystone CLI to generate devcontainers
advertise	true

Running Keystone

Keystone generates a working .devcontainer/ configuration for any git repository. It creates a devcontainer.json, Dockerfile, and run_all_tests.sh by running a coding agent inside a Modal sandbox.

Installation

# From PyPI
pip install imbue-keystone

# Or run without installing
uvx imbue-keystone --help

Both install the keystone CLI command.

Prerequisites

• Modal account — sign up here, then modal token set
• $ANTHROPIC_API_KEY — set in your environment (used by the agent inside the sandbox)
• $DOCKER_REGISTRY_MIRROR — URL of a Docker Hub pull-through cache (e.g. https://mirror.gcr.io), required when running in Modal

Basic usage

git clone https://github.com/psf/requests
keystone \
  --project_root ./requests \
  --provider claude \
  --model claude-opus-4-6 \
  --claude_reasoning_level medium \
  --max_budget_usd 1.0 \
  --test_artifacts_dir /tmp/test_artifacts

CLI options

Flag	Default	Description
--project_root	(required)	Path to the git repo
--test_artifacts_dir	(required)	Directory for JUnit XML test reports
--provider	claude	LLM provider: claude, codex, or opencode
--model	(required)	Model identifier (see below)
--max_budget_usd	1.0	Cost cap for agent inference
--agent_time_limit_seconds	3600	Agent timeout
--image_build_timeout_seconds	1800	Docker build timeout
--test_timeout_seconds	1800	Test suite timeout
--agent_in_modal / --run_agent_locally_with_dangerously_skip_permissions	Modal	Run in Modal sandbox (default) or locally
--claude_reasoning_level	(required for claude)	low, medium, or high
--codex_reasoning_level	(required for codex)	low, medium, or high
--guardrail / --no_guardrail	enabled	Structural checks on agent output
--use_agents_md / --no_use_agents_md	disabled	Use AGENTS.md + short prompt instead of full inline prompt
--log_db	~/.imbue_keystone/log.sqlite	SQLite or PostgreSQL URL for caching/logging

Available models

Provider	Model ID	Enum
claude	claude-opus-4-6	LLMModel.OPUS
claude	claude-haiku-4-5-20251001	LLMModel.HAIKU
codex	gpt-5.1-codex-mini	LLMModel.CODEX_MINI
codex	gpt-5.2-codex	LLMModel.CODEX
codex	gpt-5.3-codex	LLMModel.CODEX_53
codex	gpt-5.4	LLMModel.GPT_54
opencode	anthropic/claude-opus-4-6	LLMModel.OPENCODE_OPUS
opencode	anthropic/claude-haiku-4-5	LLMModel.OPENCODE_HAIKU
opencode	openai/gpt-5.1-codex-mini	LLMModel.OPENCODE_CODEX_MINI
opencode	openai/gpt-5.2-codex	LLMModel.OPENCODE_CODEX
opencode	openai/gpt-5.4	LLMModel.OPENCODE_GPT_54

Output

Keystone writes a BootstrapResult JSON to stdout (or --output_file) containing:

• success — whether the devcontainer was built and tests passed
• agent — execution details (duration, cost, tokens, status messages)
• verification — image build time, test execution time, pass/fail counts
• generated_files — contents of the generated devcontainer.json, Dockerfile, and run_all_tests.sh
• error_message — what went wrong (if anything)

The generated .devcontainer/ directory is also written directly into --project_root.

Examples

# Claude with high reasoning
keystone --project_root ./myrepo --provider claude --model claude-opus-4-6 \
  --claude_reasoning_level high --max_budget_usd 5.0 \
  --test_artifacts_dir /tmp/artifacts

# Codex
keystone --project_root ./myrepo --provider codex --model gpt-5.3-codex \
  --codex_reasoning_level medium --max_budget_usd 5.0 \
  --test_artifacts_dir /tmp/artifacts

# OpenCode (no reasoning level, no cost cap)
keystone --project_root ./myrepo --provider opencode \
  --model anthropic/claude-opus-4-6 --max_budget_usd 0 \
  --test_artifacts_dir /tmp/artifacts

# Run locally (no Modal sandbox — use with caution)
keystone --project_root ./myrepo --provider claude --model claude-opus-4-6 \
  --claude_reasoning_level medium --max_budget_usd 1.0 \
  --run_agent_locally_with_dangerously_skip_permissions \
  --test_artifacts_dir /tmp/artifacts

# From source
uv run keystone --project_root ./myrepo --provider claude --model claude-opus-4-6 \
  --claude_reasoning_level medium --max_budget_usd 1.0 \
  --test_artifacts_dir /tmp/artifacts