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ariangibson

firecrawl-lite-mcp-server

by ariangibson

extract_with_schema

Use a JSON schema to extract structured data from web pages. Specify URLs and a schema to retrieve consistent, machine-readable information.

Instructions

Extract structured data using a JSON schema

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
urlsYesURLs to extract data from
promptNoOptional instructions for extraction
schemaYesJSON schema defining the data structure to extract
enableWebSearchNoEnable web search for additional context
Behavior2/5

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 only states the basic action and offers no details about side effects, authentication, rate limits, or response behavior. For a tool that likely performs network I/O, this lack of transparency is a significant gap.

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

Conciseness5/5

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

The description is a single, front-loaded sentence with zero wasted words. It states the core purpose efficiently, making it easy to parse quickly.

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

Completeness2/5

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

Given the tool's complexity (4 parameters, nested objects, and sibling tools), the description is insufficient. It does not explain how 'urls' and 'schema' interact, what the 'prompt' is for, or what the output looks like. No output schema compounds the issue, leaving the agent without enough context to invoke the tool correctly.

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

Parameters3/5

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

The input schema fully describes all four parameters, so the description adds little parameter-specific value. It does mention 'using a JSON schema', which aligns with the 'schema' parameter, but does not clarify how the schema is structured or what it should contain beyond the schema description.

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

Purpose4/5

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

The description clearly states the tool extracts structured data using a JSON schema, giving a specific verb and resource. However, it does not differentiate from the sibling tool 'extract_data', which likely has a similar purpose.

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

Usage Guidelines2/5

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

No guidance is provided on when to use this tool versus siblings like 'extract_data' or 'scrape_page'. The description only implies usage via 'extract structured data', but there is no explicit context or exclusions.

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

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