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Compose Preview Catalogs

by io.github.yschimke
OverviewDiscussionsAdmin

ui_builder_rename_design

Give a design a new title. The title is the one thing about a design nothing else could change: it is set at creation, shown in every listing and the editor, and not part of any mutation. Anybody who may write the design may rename it. The revision does not move — a title is not design content — so baseRevision is not needed and an edit in flight is unaffected. Not the released envelope: the contract has no rename, so the reply is the design's listing entry with its new title.

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": {
      "designId": "<designId>",
      "title": "<title>"
    },
    "name": "ui_builder_rename_design"
  }
}

Input Schema

NameRequiredDescriptionDefault
titleYes
tokenNoA grant token from poll_access, when you cannot set the X-Compose-Preview-Token header yourself — an MCP client fixes its headers at connect time, so this is how a token approved during this session is used in it. Prefer the header where you control it.
designIdYes
agentNameNoOptional agent/client name shown to design viewers; self-reported.
agentModelNoOptional current model name shown to design viewers; self-reported. Omit when unknown.

Output Schema

NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed2 schema fields changed
    • addedInput schema / properties / agentModel
      Added value: +{
+  "description": "Optional current model name shown to design viewers; self-reported. Omit when unknown.",
+  "maxLength": 80,
+  "type": "string"
+}
    • addedInput schema / properties / agentName
      Added value: +{
+  "description": "Optional agent/client name shown to design viewers; self-reported.",
+  "maxLength": 80,
+  "type": "string"
+}
  2. Changed1 schema field changed
    • changedOutput schema / (root)
      Previous value: -nullNew value: +{
+  "type": "object"
+}
  3. First observed

TDQS

A4.2/5.0
Behavior5/5

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

With no annotations, the description carries the full burden and does so richly: title is set at creation, shown in listings/editor, not design content, requires write access, does not move the revision, leaves in-flight edits unaffected, and returns the design's listing entry. This is well beyond what structured fields provide.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

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

Front-loaded with the core action in the first sentence, then layered detail. Most sentences earn their place, though the 'Not the released envelope: the contract has no rename' phrasing is somewhat convoluted and could be tighter.

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

Completeness5/5

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

For a rename tool with an output schema, the description covers the safety profile (permission requirement), revision semantics, and side-effect scope, so nothing an agent needs to call it correctly is missing.

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 coverage is 60%, and the description explains only the absence of baseRevision and the title's semantics, not syntax for title/designId. The token, agentName, and agentModel params are documented in the schema itself, so the description adds only marginal parameter meaning.

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?

States a specific verb and resource ('Give a design a new title') and immediately distinguishes it from sibling mutations by noting the title is 'not part of any mutation' and that the revision does not move. An agent can separate this from ui_builder_apply or ui_builder_replace_design_document without opening their schemas.

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

Usage Guidelines3/5

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

Gives a permission condition ('Anybody who may write the design may rename it') and explains why baseRevision is not needed, which is useful context. However, it never explicitly routes the agent away from an alternative (e.g., why not a mutation or replace), leaving when-to-use largely implied.

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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