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

Annotations already declare readOnlyHint=false, idempotentHint=false, destructiveHint=false, so the safety profile is known. The description adds nothing beyond that: no mention that secrets are stored/attached to the function, no timeout semantics, no statement about what happens on duplicate slug/name given idempotentHint=false, no deployment/runtime behavior. For a 10-parameter write operation with a secrets object, this is a substantive gap.

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?

It is one front-loaded sentence with no filler, so there is nothing wasteful. But at this length it is terse to the point of under-specification rather than genuinely concise for the operation's complexity.

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?

A tool with 10 parameters, a nested inputFields schema, a secrets map, no output schema, and no return-value documentation gets a single seven-word sentence. Nothing explains the secrets handling, the input-field contract, timeout units, or what a successful deployment returns (function id? slug?). Grossly inadequate for the stated complexity.

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?

Schema coverage is only 60%, and even the described fields have near-placeholder text ("Source", "Name", "Slug", "About"). Four parameters — tags, secrets, timeoutMs, and the nested inputFields — are undocumented in both schema and description, and inputFields defines the function's callable signature, which is critical. The description contributes zero parameter semantics.

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?

"Create a function from code" gives a verb (create) and a resource (function), so the basic action is inferable. But it never says "hosted function," never distinguishes itself from create_product/create_user_api, and "from code" leaves the deployment target ambiguous. An agent must infer from the tool name alone that this is the hosted-function deployment path.

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?

No guidance on when to use this versus update_hosted_function (for existing functions), delete_hosted_function, or list/get_hosted_functions. No prerequisites, no mention of whether a slug collision fails or updates. The agent gets no routing signal beyond the name.

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