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rawtherapee-mcp-server

rawtherapee-mcp-server

by lucamarien
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python
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preview_lut

Apply a film simulation LUT to a RAW photo and preview the result as an inline thumbnail. Optionally preserve existing edits by merging with a base profile.

Instructions

Render an inline preview of a RAW file with a HaldCLUT film simulation applied.

Optionally merges onto an existing PP3 base_profile so WB, exposure, etc. are preserved. Returns an inline thumbnail image. Params: file_path, lut_name, base_profile (optional PP3 path), strength (0-100), max_width

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": {
      "file_path": "<file_path>",
      "lut_name": "<lut_name>"
    },
    "name": "preview_lut"
  }
}

Input Schema

NameRequiredDescriptionDefault
file_pathYes
lut_nameYes
base_profileNo
strengthNo
max_widthNo

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.4

TDQS

A4.3/5.0
Behavior3/5

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

No annotations are provided, so the description must disclose behavior. It mentions returning an inline thumbnail and optional merging, but it does not describe error handling, performance, or whether the tool is read-only. Basic transparency is present but not comprehensive.

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 concise, front-loading the main purpose and then listing parameters inline. Every sentence is necessary, with no fluff.

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 no output schema and no annotations, the description covers the main behavior, output type, and optional merge feature. It lacks details on error conditions or prerequisites, but overall it is sufficient for an agent to understand the tool's function.

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

Parameters5/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0%, but the description lists all parameters with added context: base_profile is an optional PP3 path, strength is 0-100. This compensates well, making parameters meaningful beyond their names.

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 states it renders an inline preview of a RAW file with a HaldCLUT film simulation applied, differentiating it from siblings like preview_raw (no LUT) and apply_lut (processing vs preview). The verb 'render' and resource 'inline preview' are specific.

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?

It explains when to use the optional base_profile parameter to preserve WB/exposure, providing context. However, it lacks explicit guidance on when to prefer this tool over siblings like preview_lut_comparison or apply_lut.

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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