Single tool 'execute_skill_action' has a minimal description (89 chars, below 194-char baseline) that lacks WHAT, WHEN, and actionable context. Input schema exists but parameter 'query_payload' has only a generic description ('Input execution payload') with no format, constraints, or examples. No output schema is documented, the tool returns a hardcoded JSON stub with no field descriptions. No error handling guidance. Tool name uses verb_noun pattern (acceptable) but is vague: 'execute_skill_action' does not convey what skill or what action. No parameter validation, no recovery guidance, no idempotency guarantees. The implementation is a mock that always returns success, making it unsuitable for production use.

• Expand tool description to 150 - 250 chars explaining: (1) What skill this executes (e.g., 'Extracts structured data from multi-modal chart images'), (2) When to use it (e.g., 'Call when you need to parse chart data into tables'), (3) What it returns (e.g., 'Markdown table, confidence score, and structured JSON URL'). Reference pattern:tool-description.
• Document the output schema with typed fields: { status: string (enum: SUCCESS|ERROR|PARTIAL), message: string, chart_extraction_id?: string, detected_chart_type?: string, extracted_markdown_table?: string, ocr_data_point_confidence_score?: number, structured_dataframe_json_url?: string }. Reference pattern:response-shaper.
• Add constraints to 'query_payload' parameter: describe expected format (JSON object with 'chart_image_url' and optional 'chart_type_hint'), provide an example structure, and specify max length. Reference pattern:constrained-input.
• Add error handling guidance: document what errors can occur (invalid image URL, unsupported chart type, OCR failure), categorize as retryable or user-fixable, and provide recovery steps (e.g., 'If OCR confidence < 0.8, try a higher-resolution image'). Reference pattern:recovery-guide.
• Rename tool to 'extract_chart_data' or 'extract_chart_to_table' to be more specific about the action and resource. Avoid generic verbs like 'execute' and 'action'. Reference pattern:tool.