pawlsa-mcp has 10 tools with basic naming and descriptions, but significant gaps in schema completeness, parameter documentation, and error handling. Tool names follow verb_noun convention (pw_link_create, mixer_set_volume), which is good. However, descriptions are minimal (10-50 chars), parameter descriptions lack detail on constraints/ranges, and output schemas are not documented. No error recovery guidance, no input validation hints, and no security/permission documentation. The server operates on system audio/PipeWire state with destructive operations (pw_link_destroy, mixer_set_switch) but lacks confirmation patterns or dry-run support.

• Expand tool descriptions to 50-200 characters. Include WHAT the tool does, WHEN to use it, and what it returns. E.g., 'Create a link between two PipeWire ports to route audio. Requires valid output_node, output_port, input_node, input_port IDs. Returns link_id on success or error if ports are incompatible.'
• Add enum constraints for parameters with known valid values. E.g., sample_format in play_pcm should be an enum: ['s16le', 's32le', 'f32le', 'f64le']. Add min/max for numeric params: volume 0-100, channels 1-8.
• Document output schemas for all tools. Specify what fields are returned on success (e.g., pw_link_create returns {link_id: u32, status: string}). Include IDs needed for chaining (e.g., if a tool creates a link, return the link_id so agents can destroy it later).
• Add confirmation or dry-run support for destructive operations. E.g., add a 'confirm' boolean parameter to pw_link_destroy, or implement a separate 'preview_link_destroy' tool that shows what would be destroyed without executing.
• Enhance error descriptions with recovery paths. E.g., 'If mixer element not found, call mixer_list_elements(card_index) to see available controls.' Include error classification (retryable vs. user-fixable vs. fatal) in tool descriptions.

Inferred effective spec: <=2025-11-25.

• Relies on Logging (deprecated) - log to stderr or use OpenTelemetry