PIOS MCP server has 4 tools with minimal schema definition and inconsistent parameter documentation. All tools lack input parameter descriptions in their schema definitions. pios_init has one optional parameter (ide) with a description, but pios_status, pios_validate, and pios_next have empty input objects with no schema detail. Descriptions are present but generic (avg ~100 chars). No output schemas documented. No error handling guidance. Tool names follow verb_noun pattern (good), but lack clarity on what distinguishes pios_validate from pios_status. No pagination, no structured output guidance, no recovery hints.

• Add explicit input schemas to pios_status, pios_validate, and pios_next. Even if they accept no parameters, declare 'input': {'type': 'object', 'properties': {}, 'required': []} to signal intentional emptiness.
• Document output schemas for all tools. E.g., pios_status should declare it returns {current_gate: string, tasks: {pending: int, in_progress: int, completed: int}}.
• Add enum constraint to pios_init's 'ide' parameter: ['cursor', 'windsurf', 'claude']. Prevents LLM hallucination.
• Rename pios_validate to pios_check_tasks or pios_validate_tasks to clarify it validates task completion, not general project status. Reduces LLM confusion with pios_status.
• Add error recovery guidance: 'If validation fails, review TASKS.md and mark completed items with [x]. Then retry pios_validate.' Helps LLMs self-correct.