Single tool 'diff_namespaces' has critical definition gaps. Tool name lacks action verb (should be 'compute_diff' or 'get_namespace_diff'). Description is minimal (8 words, well below 20-char threshold). Input schema present but parameters lack descriptions, 'before' and 'after' are ambiguous without context. No output schema documented. No error handling guidance. Tool appears functional but fails multiple baseline quality checks from the 549-tool production dataset.

• Rename tool to 'compute_namespace_diff' or 'get_state_diff', start with action verb to signal intent.
• Expand description to 50-150 chars: 'Compares two runtime namespace snapshots and returns added, modified, and removed variables. Use after each agent step to track state mutations. Returns counts and detailed diffs per variable.'
• Add parameter descriptions: before: 'Namespace snapshot before changes, dict with {var_name: {type: str, repr: str}}'; after: 'Namespace snapshot after changes, same structure.'
• Document output schema in tool description or as a separate schema field: {has_changes: bool, added_count: int, modified_count: int, removed_count: int, added: object, modified: object, removed: object}.
• Add error handling: validate that 'before' and 'after' are dicts; return structured error like '{error: "Invalid input", message: "before and after must be dictionaries", recovery: "Call take_snapshot() to generate valid snapshots."}'.