trmnl_update_user_theme

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

Annotations already declare readOnlyHint=false, openWorldHint=true, idempotentHint=false and destructiveHint=false, so the mutation and non-idempotent profile is known. The description contributes the account-level enablement gate (theme builder) and the underlying PATCH route, but adds nothing about what a successful update returns, whether partial bodies merge or replace, or how failures (e.g. 422 on unknown tokens) surface — and the boilerplate "Changes remote state or starts work" largely restates 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.

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

The key facts (verb, prerequisite, route) are front-loaded in three short lines, which is good structure. However, the trailing sentence "Changes remote state or starts work. Run only within the user-authorized scope." is generic boilerplate that restates annotation data and dilutes an otherwise tight definition.

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

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

For a nested, partially-documented mutation with no output schema, the description covers only the enablement prerequisite and the HTTP verb, leaving partial-update semantics and result handling to the schema. The rich nested schema props make it workable, but the description itself does not round the tool out.

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

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

At 33% schema description coverage the description should compensate, and it does not — it says nothing about path.id, body, or profile. The schema itself is unusually self-documenting (the settings object explains defaults, vocabularies, and the 422-on-unknown-token rule), which keeps this at an adequate baseline rather than lower, but the description adds zero parameter meaning of its own.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb+resource ("Update a theme") and pins the endpoint (PATCH /api/user_themes/{id}), so the agent knows exactly which entity is mutated. It never distinguishes itself from close siblings like trmnl_create_user_theme, trmnl_get_user_theme, or trmnl_import_user_theme, though the verb alone carries most of the differentiation.

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

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

The prerequisite "Requires the theme builder to be enabled for the account" is a genuine usage precondition that tells the agent when this call can succeed. Beyond that there is no when-to-use/when-not guidance and no routing to alternatives such as trmnl_import_user_theme or trmnl_create_user_theme, and "Run only within the user-authorized scope" is generic policy boilerplate rather than a selection rule.

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