Search A2A (Agent2Agent) protocol documentation by keyword query.

Args: query: Search terms to find in the documentation. Supports full-text search with stemming (e.g., "authenticate" matches "authentication", "authenticated"). section: Optional section to filter results. Common sections include 'root' (top-level pages such as the specification and community pages), 'topics' (core concepts), 'tutorials', and 'sdk'. source: Optional documentation source to filter results. Currently only 'a2a' (a2aproject/A2A docs/ directory) is indexed. limit: Maximum number of results to return (default: 10, max: 50).

Returns: JSON-formatted search results with title, URL, snippet, and relevance score.

Read the full content of a specific A2A protocol documentation page.

Args: path: The relative path to the documentation file, prefixed with the source name (e.g., 'a2a/topics/what-is-a2a.md' or 'a2a/specification.md'). This path is returned in search results.

Returns: The full markdown content of the documentation page, or an error message if the page is not found.