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

With no annotations, the description carries the full burden and does well: it discloses the link is one-time, that it is the secure path for BYOK, the flat 0.1 credit cost, and that the user's provider account foots the provider bill. It omits link expiry/validity window and any auth requirement, which are the main remaining behavioral unknowns.

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?

Three short sentences, front-loaded with what the tool returns, followed by the usage rule and the cost model. Every sentence earns its place with no redundancy.

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 single-parameter tool with no output schema and no annotations, the description covers purpose, usage mandate, and cost model adequately; the returned link is implied by 'get a secure one-time link.' Minor gaps remain around link expiry and how the link is delivered to the user.

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 100% and the schema already explains that provider is an API slug from search_apis with an example ('fal'). The description only says 'for a provider' and adds no format, casing, or sourcing detail beyond the schema, so baseline 3 is appropriate.

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 (get) and a specific resource (a secure one-time link for saving the user's own API key), with the BYOK scope made explicit. An agent can distinguish this from call_api or vendor_call, which consume keys rather than collect them.

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?

Gives a strong directive: 'Never ask the user to paste an API key into the chat — always use this link instead,' which tells the agent when to reach for this tool over an ad-hoc request. It does not, however, contrast with siblings like secret_generate or secret_transfer, which also deal with secrets, so routing between those is left to inference.

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