Server has 9 tools with clear naming (verb_noun pattern: get_*, find_*) and reasonable descriptions (100-250 chars). However, critical gaps exist: input schemas are present but lack proper type definitions for most parameters (all region/zone/country_code params are bare strings with no enum constraints despite accepting only specific values). Parameter descriptions are adequate but generic. Output schemas are completely undocumented, no return type specifications visible. Error handling is minimal; no recovery guidance or actionable error messages. Tools follow single-responsibility principle well. Missing: enum constraints for constrained inputs (regions, zones, country codes), documented output schemas, error classification, and input validation guidance.

• Add enum constraints to all region/zone/country_code parameters. E.g., region: {type: string, enum: [South West England, South East England, London, ...]}. This prevents hallucinated values and makes the tool self-documenting.
• Document output schemas for all tools. Add a 'Returns' section to each docstring specifying field names, types, and meanings. E.g., 'Returns: {region: str, intensity_gco2_kwh: float, index: str (low|moderate|high|very high), generation_mix: list[{fuel: str, perc: float}]}'.
• Add min/max constraints to numeric parameters in schema. E.g., hours_ahead: {type: integer, minimum: 1, maximum: 48, default: 24}. Include these in parameter descriptions too.
• Enhance error messages with recovery guidance. When region not found, return: 'Region "xyz" not found. Available regions: South West England, South East England, ... Try one of these or call get_uk_carbon_intensity() with no region for national data.'
• Add readOnlyHint: true to all tool schemas to signal to agents that these tools are safe to call without side effects and can be retried without risk.