MCP Server Box

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description carries the full burden of behavioral disclosure. It effectively describes key behaviors: it's a read operation (extracts data), combines information from multiple files into one record, and specifies the output format ('json string format'). However, it doesn't mention potential limitations like file size constraints, processing time, or error handling, which could be useful for an agent.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is well-structured and front-loaded with the core purpose. Every sentence adds value: the first states the goal, the second explains multi-file handling, use cases provide concrete examples, and exclusions prevent misuse. There's no redundant or verbose content, making it efficient for an agent to parse.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the tool's complexity (AI-based extraction with multiple files and templates) and lack of annotations or output schema, the description does a good job covering key aspects: purpose, usage, parameters, and output format. However, it could be more complete by mentioning authentication needs, rate limits, or what happens if extraction fails, which are relevant for an agent's decision-making.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0%, so the description must compensate. It adds meaningful context for all parameters: 'file_ids' is explained as 'The IDs of the files to read' with examples, 'template_key' as 'The ID of the template to use for extraction,' and 'ai_agent_id' as optional for 'The ID of the AI agent to use for processing.' This clarifies purpose beyond the bare schema, though it doesn't detail format constraints (e.g., template structure).

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool's purpose: 'Extract structured data from one or more files and return a SINGLE metadata instance.' It specifies the verb ('extract'), resource ('files'), and output ('single metadata instance'), and distinguishes it from siblings like batch processing tools by explicitly stating 'NOT for batch processing.'

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides explicit guidance on when to use this tool vs alternatives. It includes use cases (single file, multiple files) and explicitly states when not to use it ('NOT for batch processing'), with a clear alternative: 'call this tool once per file in a loop.' This helps the agent choose correctly among extraction-related siblings.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.