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Contraption Company MCP

Contraption Company MCP

Official
by philipithomas
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python
Hybrid

list_posts

Retrieve blog posts with pagination, sorting by newest or oldest, and control the number of posts displayed per page.

Instructions

List blog posts with pagination.

Args: sort_by: Sort order - 'newest' or 'oldest' (default: 'newest') page: Page number (default: 1) limit: Number of posts per page, max 10 (default: 10)

Returns: List of post summaries with metadata

Tool call template

This tool declares no required parameters. Add optional parameters from the input schema as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {},
    "name": "list_posts"
  }
}

Input Schema

NameRequiredDescriptionDefault
sort_byNonewest
pageNo
limitNo

Output Schema

NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observed

TDQS

A3.5/5.0
Behavior3/5

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

With no annotations provided, the description carries the full burden. It mentions pagination and max limit (10), which are useful behavioral traits. However, it doesn't cover aspects like rate limits, authentication needs, or error handling, leaving gaps for a tool with no annotation support.

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 well-structured and front-loaded with the core purpose. The Args and Returns sections are organized efficiently, with no wasted sentences—each part earns its place.

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

Completeness4/5

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

Given the tool's moderate complexity (3 parameters, no annotations, but with an output schema), the description is fairly complete. It covers parameters well and mentions return values, though it could benefit from more behavioral context like error cases or performance hints.

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

Parameters4/5

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 provides clear semantics for all three parameters (sort_by, page, limit), including defaults and constraints (e.g., max 10 for limit), adding significant value beyond the bare schema.

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 verb ('List') and resource ('blog posts'), and mentions pagination which adds specificity. However, it doesn't explicitly differentiate from sibling tools like 'fetch' or 'search', which might have overlapping functionality.

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 the sibling tools 'fetch' or 'search'. The description implies usage for listing posts with pagination but doesn't specify alternatives 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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