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Oh My Posh Validator

by dev.ohmyposh
OverviewDiscussionsAdmin

validate_segment

Validate a segment snippet against the oh-my-posh schema. Useful for validating individual prompt segments before adding them to a configuration.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "content": "<content>"
    },
    "name": "validate_segment"
  }
}

Input Schema

NameRequiredDescriptionDefault
formatNoThe format of the segment (auto-detect if not specified)auto
contentYesThe segment content as a string (JSON, YAML, or TOML)

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observed

TDQS

A3.7/5.0
Behavior2/5

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

No annotations are provided, so the description carries full responsibility for behavioral disclosure. It only states that validation happens against a schema, but offers no details about return values, error handling, whether it modifies anything, or how the auto-format detection works. This is a significant gap for an agent invoking the tool.

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 two sentences long, front-loaded with the core purpose, and contains no filler. Every word contributes to understanding the tool's function and use case.

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

Completeness3/5

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

Given the tool's simple nature and complete schema, the description covers purpose and usage context adequately. However, without annotations or an output schema, it fails to specify the outcome of validation (e.g., success/failure signals), which is essential for an agent to act on the result.

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 schema already provides 100% parameter coverage with descriptions for both 'format' and 'content', so the baseline is 3. The description adds no additional parameter-level meaning beyond what the schema already offers, but it also doesn't need to.

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 uses a specific verb ('Validate') with a clear resource ('segment snippet') and context ('against the oh-my-posh schema'). It distinguishes itself from the sibling tool by focusing on 'individual prompt segments' rather than a full configuration.

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

Usage Guidelines4/5

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

The description clearly identifies when this tool is useful: 'before adding them to a configuration.' However, it does not explicitly mention when not to use it or the alternative validate_config, even though the sibling tool name implies that distinction.

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

All Oh My Posh Validator toolsInspect
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