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

Beyond the annotations, the description discloses the null-to-reset semantics and UI-only logo restriction, which materially change how the tool should be called, and it flags the owner/admin requirement. The annotations already signal a non-read, non-destructive, idempotent mutation, and the description adds further behavioral context without contradicting them.

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?

Four tightly packed sentences, each earning its place: the action and fields, the reset behavior, the access/limitation context, and the inspection workflow. Key information is front-loaded and nothing is redundant.

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 four-parameter mutation with no output schema, the description covers the important semantics, permissions, and a follow-up inspection call. The main omissions are explicit workspaceId guidance and any statement about return format, but the description is otherwise sufficient to call the tool correctly.

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?

With zero schema descriptions, the description compensates by explaining brandName, primaryColor with a valid hex example, and hidePoweredBy, plus the shared null-reset behavior. The workspaceId parameter is not mentioned or given a format/requirement, but it is inferable from the name and the schema marks no parameters as required.

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?

The description opens with a specific verb and resource ('Update a workspace's branding') and enumerates the three mutable fields (brandName, primaryColor, hidePoweredBy), so an agent knows exactly what the tool affects. It does not explicitly contrast this with similarly named siblings like update_brand_identity or update_workspace, leaving some differentiation to inference.

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?

It gives explicit when-not guidance ('Logo upload is UI-only'), an access prerequisite ('Owner/admin only for user API keys'), and a companion workflow ('Use campaignstack_get_workspace_branding to inspect current values'). This is concrete enough for an agent to decide whether to invoke this tool and how to verify its effects.

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