Update or pause a short link

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

Adds useful behavioral context beyond annotations: paused links stop redirecting but are not deleted, an API key is required, and changing destinations requires a paid plan. This is consistent with the annotations (readOnlyHint=false, idempotentHint=true, destructiveHint=false) and enriches the agent's understanding of side effects and constraints.

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 concise sentences that front-load the main action. The first sentence states what the tool does, the second clarifies a behavioral nuance, and the third lists requirements. No filler or repetition.

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 relatively simple tool with three parameters and no output schema, the description covers the primary use cases, constraints, and authentication requirements. Minor gaps exist, such as unspecified behavior when both 'url' and 'paused' are supplied simultaneously, but these are not critical for basic invocation.

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 already documents all three parameters at 100% coverage. The description adds semantic context for two key parameters: the 'url' parameter requires a paid plan, and the 'paused' parameter affects redirect behavior without deletion. This goes beyond the schema's basic property descriptions.

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?

Clearly states the tool's function with specific verbs 'change' and 'pause/resume' on the resource 'short link'. This distinguishes it from sibling tools: it is not for creating links (shorten_link), deleting links (delete_link), or retrieving stats (get_link_stats).

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?

Provides clear context for when to use the tool: updating an existing link's destination or pausing/resuming it. It also states prerequisites (API key) and a condition (paid plan for destination changes). However, it does not explicitly mention alternative tools or when not to use it, so it stops short of full exclusionary guidance.

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