Compose Preview Catalogs

ui_builder_get_links

Read what a design is for: the issue it was drawn for, the reference frame in the design tool it reproduces, the pr that implemented it, the thread it is being discussed in, and the previous design it continues. Start a session on somebody else's design here — it is the brief, and it is what ui_builder_get_design cannot tell you. Every field is optional; a reply with none of them means nobody has said yet. The record is kept beside the design and is never part of it: no node holds it, no export sees it, and writing one does not move the revision. Ancestry rides along where there is some: forkedFrom / forks for a fork made with ui_builder_fork_design, and branchOf / branches for a design branch and its parent.

Input Schema

TableJSON Schema

Name	Required	Description
`token`	No	A 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.
`designId`	Yes
`agentName`	No	Optional agent/client name shown to design viewers; self-reported.
`agentModel`	No	Optional current model name shown to design viewers; self-reported. Omit when unknown.

Output Schema

TableJSON Schema

Name	Required	Description	Default
No arguments

Schema Changelog

Changes observed during successful MCP inspections.

Changed2 schema fields changedOct 4, 2026

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"
+}

Changed1 schema field changedSep 30, 2026
- changedOutput schema / (root)
```
Previous value: -nullNew value: +{
+  "type": "object"
+}
```
First observedSep 30, 2026

TDQS

A4.3/5.0

Behavior5/5

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

With no annotations, the description carries the whole burden and does so well: it discloses that every field is optional, that an empty reply means nobody has recorded anything yet, that the record lives beside the design (no node holds it, no export sees it, writing does not move the revision), and how ancestry fields behave. These are non-obvious traits an agent could not infer from the schema.

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-loads the purpose in the first clause and every sentence carries information. The prose is stylistically heavy ('The record is kept beside the design and is never part of it'), but those clauses deliver real behavioral facts rather than padding.

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?

For a read tool with an output schema, the description covers selection context, optionality of fields, storage semantics, and ancestry relationships. Input-side detail is left to the schema, which is acceptable given 75% coverage, though the token/agentName mechanics are only in the schema.

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 75% and the schema already documents token, agentName, and agentModel, including the header-vs-token tradeoff. The description adds no input-parameter meaning at all (its enumerated fields are return values, not arguments), so the baseline 3 is appropriate.

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 (read the design's links) and enumerates exactly which fields it returns: issue, reference, pr, thread, previous. It explicitly differentiates itself from the sibling ui_builder_get_design by naming what that tool cannot tell you.

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?

Gives a concrete when-to-use scenario ('Start a session on somebody else's design here — it is the brief') and routes against ui_builder_get_design. It does not name ui_builder_set_links as the write counterpart or state explicit exclusions, so it stops short of the full when/when-not treatment.

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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