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mcp-public-apis

by josephsenior

find_no_auth_apis

Find public APIs requiring no authentication. Filter by category, HTTPS only, and limit results.

Instructions

Returns APIs that require zero authentication, optionally filtered by category.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
categoryNoOptional category filter
httpsOnlyNoOnly return HTTPS APIs (default: true)
limitNoMax results (1-20, default: 10)
Behavior2/5

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

No annotations exist, so description carries full burden. It lacks details on response format, pagination, prerequisites, or side effects, beyond what the schema implies.

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?

Single sentence with zero waste, front-loaded with core action and optional filter.

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?

Lacks return format description (no output schema) and fails to contextualize among siblings, leaving the agent with gaps despite tool simplicity.

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?

Schema coverage is 100% with descriptions for all parameters; the description adds no new meaning beyond restating the category filter, so baseline of 3 is appropriate.

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

Purpose5/5

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

The description clearly specifies the tool returns APIs requiring zero authentication, with optional category filtering, distinguishing it from siblings like search_apis (likely all APIs) and get_categories (categories only).

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

Usage Guidelines3/5

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

The description implies using this tool for no-auth APIs but does not explicitly contrast with alternatives (e.g., search_apis if auth needed) or provide when-not-to-use guidance.

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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