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canact

Probe an LLM against this host's tools and return a capability card the host can use: how many tools to send, which edit format to pick, whether to enable XML fallback, and whether to wrap JSON in a repair layer.

Catalog flags (supports_function_calling: true, context: 128k) are priors. canact spends seconds of real prompts on this model, this template, and this tool schema, then writes host policy.

Default features are empty. A library pin uses default-features = false plus runtime. The CLI and MCP server need --features cli.

Read the card defines host, host policy, the fixed probe tool set, the context ladder, and the envelope.