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

With no annotations, the description carries full behavioral burden. It discloses key traits: the effect (leaves the followed list), the persistence ('later fetches do not re-add it'), the reversal tool, the parameter provenance, and the cost (no credits consumed). This is strong disclosure. A minor gap is it doesn't state whether existing downloads or history are affected, or what the response returns.

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?

A tight, front-loaded paragraph with no filler. Every clause (effect, persistence, inverse, source, cost) earns its place.

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 mutation with no annotations or output schema, the description covers effect, persistence, inverse, source, and cost. It is nearly complete, missing only the return/value behavior, which is minor given the schema handles the input and no output schema exists.

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%, so the schema already documents the podcast_id with its source. The description reinforces this by naming list_following as the source, but adds no syntax or format detail beyond the schema. 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?

The description states a specific verb+resource ('Mute a show') and distinguishes it from its sibling by naming the inverse operation ('follow_podcast reverses it'). An agent can immediately tell this is the unfollow operation and how it relates to other tools in the family.

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?

It explicitly directs the agent on the parameter source ('Pass a podcast_id from list_following') and names the reversing tool. The when-to-use context is clear and the tool's relationship to its inverse is documented.

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