Pararam Nexus MCP

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It describes a read operation ('Get') and mentions the return format, but doesn't cover critical aspects like authentication requirements, rate limits, error handling, or whether it's idempotent. For a tool with no annotations, this leaves significant gaps in understanding its behavior beyond basic functionality.

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 front-loaded with the core purpose in the first sentence, followed by structured sections for Args and Returns. Each sentence earns its place by providing essential information without redundancy. It's appropriately sized for a single-parameter tool with an output schema, making it efficient and easy 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 low complexity (1 parameter, no nested objects) and the presence of an output schema (which handles return value details), the description is mostly complete. It covers the purpose, parameter semantics, and return content. However, with no annotations, it could benefit from more behavioral context like error cases or usage constraints to be fully comprehensive.

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?

The description adds meaningful context for the single parameter 'url' by specifying it must be a 'Pararam.io URL' and providing an example format. Since schema description coverage is 0% (the schema only indicates 'url' is a required string without description), the description compensates well by explaining the parameter's purpose and format, though it could add more details like URL validation rules.

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: 'Get a specific message from a pararam.io URL.' It specifies the verb ('Get') and resource ('a specific message'), and distinguishes it from siblings like get_chat_messages (which likely retrieves multiple messages) or search_messages (which searches). However, it doesn't explicitly differentiate from all siblings, such as get_post_attachments, which might be related but not identical.

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 implies usage by specifying it's for retrieving a message from a URL, suggesting it's used when you have a direct URL rather than searching or listing messages. However, it doesn't explicitly state when to use this tool versus alternatives like get_chat_messages or search_messages, nor does it provide exclusions or prerequisites. The context is clear but lacks explicit guidance on alternatives.

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