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MCP Tools Lab

process_json

Validate, format, or minify JSON text, with optional key sorting and two-space pretty output.

Instructions

Validate or format JSON using Python numbers; pretty output uses two spaces.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
textYes
actionNoformat
sort_keysNo

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

C2.6/5.0
Behavior2/5

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

With no annotations at all, the description carries the full burden. It discloses one output trait (pretty output uses two spaces) but says nothing about failure behavior on malformed JSON, whether validation is non-mutating, or what the response looks like for each action. For a validator this 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.

Conciseness3/5

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

It is a single sentence with the primary purpose front-loaded, which is good. The phrase 'using Python numbers' is cryptic and reads as an implementation detail whose significance to the caller is unclear, so the sentence is short but not fully earned.

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?

With no output schema, no annotations, and zero parameter descriptions, the definition should explain the actions and the sort_keys flag plus error behavior. It covers only part of the action set and no parameter semantics, leaving an agent unable to invoke the tool confidently.

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

Parameters2/5

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 and largely does not. It hints at the validate/format actions and the two-space indent, but never mentions minify, never explains sort_keys, and never clarifies the default action behavior beyond the schema's own default.

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?

States a specific verb pair (validate/format) and resource (JSON), which is enough to separate it from text-oriented siblings like analyze_text and compare_text. However it omits the third supported action (minify) that the schema enum exposes, so the stated purpose is narrower than the tool actually is.

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?

There is no when-to-use guidance, no indication of when this is preferable to sibling tools, and no note on whether invalid input raises an error or returns a diagnostic. The agent must infer all routing decisions on its own.

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