Shorten many URLs at once

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

The annotations already indicate a write operation (readOnly=false), and the description adds valuable context by mentioning "Requires an API key" and the batch limit of 100. This goes beyond the annotations without contradicting them, though it does not discuss partial failures or idempotency.

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 description consists of two concise sentences, each carrying essential information: action/scope and usage guidance. There is no repetition or superfluous detail.

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 simple bulk-creation tool with one well-documented parameter, the description covers purpose, usage, and authentication requirements. It lacks details about response format or partial failure behavior, but given the tool's straightforward nature and the annotations provided, this is a minor omission.

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?

The schema fully documents the only parameter 'links' with descriptions like 'Up to 100 links to create' and nested fields. The tool description does not add significant new parameter-level meaning beyond what the schema already provides, so the baseline of 3 applies.

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 clearly states the tool's action and scope: "Create up to 100 short links in a single request." It distinguishes this from sibling shorten_link by specifying batch creation, making it immediately clear what the tool does and when it differs.

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 second sentence provides explicit guidance: "Use this instead of calling shorten_link repeatedly when shortening several URLs." This directly tells the agent when to choose this tool over the alternative, which is strong usage guidance.

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