Colour Memory

by app.railway.up.colour-memory-api-production

Colour DNA Fingerprint

colour_dna

Read-only

Compact semantic fingerprint for a single hex colour. This is one component of colour_passport. Returns the fingerprint format alone; colour_passport returns the general colour profile that includes it. The result already carries the rendered palette and its PNG, PDF, ASE, JSON and CSS downloads, ready to show the customer. The archive anchors a colour was derived from are evidence, not the recommended colours. A final palette chosen from this evidence is registered with palette_finalize, called once with those exact colours, so the customer can see and download what was actually recommended.

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": {
      "hex": "<hex>"
    },
    "name": "colour_dna"
  }
}

Input Schema

Name	Required	Description	Default
`hex`	Yes	Hex colour to fingerprint e.g. '#4A2A50'

Output Schema

Name	Required	Description	Default
No arguments

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedJun 20, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "additionalProperties": true,
+  "description": "Structured JSON response. Shape varies by tool; most return an 'ok' boolean plus a 'result' or 'results' field with the tool's data payload.",
+  "type": "object"
+}

Changed1 schema field changedJun 17, 2026

changedOutput schema / (root)

Previous value: -{
-  "properties": {
-    "error": {
-      "type": "string"
-    },
-    "ok": {
-      "type": "boolean"
-    },
-    "result": {
-      "type": [
-        "object",
-        "array",
-        "string",
-        "null"
-      ]
-    }
-  },
-  "type": "object"
-}New value: +null

Changed1 schema field changedMay 30, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "properties": {
+    "error": {
+      "type": "string"
+    },
+    "ok": {
+      "type": "boolean"
+    },
+    "result": {
+      "type": [
+        "object",
+        "array",
+        "string",
+        "null"
+      ]
+    }
+  },
+  "type": "object"
+}

AddedMay 29, 2026

TDQS

A3.8/5.0

Behavior4/5

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

With only readOnlyHint=true in the annotations, the description adds useful behavioral context: it describes the returned fingerprint, mentions included rendered palette downloads, and warns that archive anchors are evidence rather than recommended colours. It does not describe authentication or rate limits, but for a read-only one-parameter lookup it adds meaningful guidance beyond the annotations.

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?

The purpose is front-loaded, but the description runs five sentences for a one-parameter tool and drifts into downstream palette_finalize workflow. The return/download sentence and archive-evidence sentence are relevant, but the overall text is less compact than the tool it describes.

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 simple input, read-only annotation, and existing output schema, the description covers purpose, sibling relationship, output expectations, and downstream usage sufficiently. Its main weakness is the slight ambiguity between 'fingerprint format alone' and the statement that the result carries a palette and downloads.

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?

Schema description coverage is 100%, and the schema already defines the sole hex parameter with an example. The description only restates that the input is a single hex colour, so it adds little parameter meaning beyond the structured 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 identifies the tool as producing a compact semantic fingerprint for a single hex colour and distinguishes it from colour_passport, which returns the broader profile. The purpose is understandable, though the later claim that the result also carries a rendered palette and multiple downloads slightly muddies the idea of a fingerprint-only return.

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 gives a clear selection context by explaining that this tool returns the fingerprint alone while colour_passport returns the general profile that includes it. It also mentions palette_finalize for registering a final palette, but does not explicitly state when not to use colour_dna beyond that component relationship.

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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