Module extension 

Structs

AfterToolCallResult

Partial override returned from after_tool_call (matching pi’s AfterToolCallResult). Merge semantics are field-by-field: provided fields replace the original; omitted fields keep their values.

AutocompleteItem

An autocomplete item for slash command arguments.

BeforeCompactResult

Result returned from before_compact (matching pi’s SessionBeforeCompactResult). Returning { cancel: true } prevents compaction.

BeforeToolCallResult

Result returned from before_tool_call (matching pi’s BeforeToolCallResult). Returning { block: true } prevents execution; reason becomes the error text.

Cancel

Simple cancellation token for tool execution. Shared between the agent loop and tool execution to signal cancellation.

SlashCommand

A registered slash command.

ToolDefinition

A tool bundled with its prompt metadata.

ToolRenderContext

Context passed to ToolRenderer methods (matching pi’s ToolRenderContext). Carries all metadata about the tool execution that renderers may need.

ValidationError

A single validation error, matching pi’s TypeBox error structure.

Enums

CommandResult

Result of executing a slash command.

Traits

CommandHandler

A slash command handler (built-in or extension-provided). Commands use the same Extension trait as tools - built-ins and user extensions register commands through a uniform interface.

Extension

ToolRenderer

Tool-specific rendering interface (matching pi’s renderCall/renderResult pattern). Each built-in tool implements this to provide its own visual representation.

Functions

coerce_primitive_by_type

Coerce a single JSON value to match a JSON Schema type (modifies in place). This handles common LLM mistakes: sending numbers as strings, booleans as strings, etc.

coerce_with_json_schema

Recursively coerce tool arguments to match a JSON Schema (modifies in place).

validate_tool_arguments

Validate tool arguments against its JSON Schema (matching pi’s validateToolArguments).