26 tools with highly variable quality. Most lack comprehensive parameter descriptions and output schemas. Tool names follow verb_noun convention (parse_, convert_, render_, extract_, etc.), which is good. However, 15+ tools have minimal or generic descriptions (under 50 chars). Parameter schemas are present but sparse: many lack type constraints, enums, or validation guidance. No visible error handling patterns or recovery guidance. Output schemas are not documented. The rdkit_workbench and extract_structures_via_decimer_api have more detailed descriptions, but most tools (parse_reaction, convert_cdx_cdxml, render_to_png, etc.) are under-specified for LLM reasoning.

• Expand all tool descriptions to 100-200 characters. Include WHAT the tool does, WHEN to use it (vs similar tools), and what it returns. E.g., 'Parse reaction schemes from CDXML files to extract reactants, products, and reaction conditions. Use this to analyze chemical workflows before rendering or merging. Returns structured reaction data with atom/bond indices.'
• Add enum constraints to all string parameters. In tool_registry.py, declare approach as enum: ['bbox_center', 'arrow_driven', 'proportional', 'compact', 'golden_ratio', 'chemdraw_mimic']. Same for operation in rdkit_workbench and hand_drawn in extract_structures_via_decimer_api.
• Document output schemas for all tools. Add a 'Returns' section to each tool docstring specifying the JSON structure. E.g., rdkit_workbench returns {ok: bool, outputs: {operation: string, results: array, truncated: bool}, metadata: {provenance: string}}.
• Add error handling guidance to descriptions. E.g., 'Raises FileNotFoundError if CDXML path does not exist (user-fixable: check path). Raises ValueError if CDXML is malformed (retryable: validate XML). Raises TimeoutError if rendering takes >60s (retryable: try again or reduce complexity).'
• For batch tools, return per-item results with success/failure status. E.g., render_cdxml_files returns {ok: true, outputs: {results: [{path: string, status: 'success'|'failed', error?: string, output_path?: string}]}}.