Cleanup Devices

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

With no annotations, the description carries the whole burden. It does disclose the most important behavioral trait for a mutation: removal happens immediately ("removed here, right away"), implying no confirmation step and no undo. It is silent on permissions/auth requirements, idempotency (what happens when there are no leftovers), and whether the operation can affect the device the server currently reuses.

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 the action and target before the rationale. The parenthetical about reusing the web-player device is slightly more backstory than an agent strictly needs, but it earns its place by explaining why the leftovers exist.

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?

An output schema exists, so return values need not be described. For a destructive, unannotated, no-argument tool, though, the description should say more about safety and side effects: whether deletion is scoped strictly to this server's stale entries, whether the currently-used device is protected, and whether the call is safe to repeat. What is present is accurate, but the risk surface is only partially covered.

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 tool takes zero parameters and the description does not pretend otherwise, so there is nothing to mis-specify. The 100% schema coverage reflects an empty properties object, so the baseline of 4 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?

States a specific verb and a precisely-scoped resource: removes leftover "MCP Spotify Free" Connect devices belonging to this server. The explanation that the server now reuses the account's web-player device makes clear this is a legacy artifact cleanup, which distinguishes it from the adjacent list_devices (read) tool. It stops short of an explicit contrast with any sibling, but the scope is unambiguous.

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 description supplies the implied trigger (entries left behind by earlier versions of this server that no longer register their own device), so an agent can infer when the tool is relevant. However, it never states when NOT to call it, whether currently active devices could be caught in the sweep, or points to list_devices as a way to inspect first. Usage is implied rather than directed.

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