streamelements_close

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

With no annotations supplied, the description carries the full behavioral burden. It does add genuinely useful context that the caller would not otherwise know: that a live session consumes credits, which motivates the call. It says nothing about idempotency, behavior when no session exists, or what happens if an interaction is mid-flight, so the mutation/termination semantics remain partly opaque.

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?

One sentence, front-loaded with the action and resource, followed by the condition and the rationale. Every clause earns its place and nothing is padded.

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 zero-parameter, non-destructive session-termination tool with no output schema, the description covers the essential what, when, and why. Only minor gaps remain around failure or repeat-call behavior, which are unlikely to change how an agent invokes it.

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 schema is empty with additionalProperties false, so there is no parameter meaning for the description to add. Baseline 4 applies; nothing is missing or contradicted.

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 ('Close') and a specific resource ('StreamElements browser session'), which is enough to distinguish it from streamelements_open and the other interaction siblings. It stops short of naming the counterpart tool explicitly, so the pairing is inferred rather than stated.

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 clear trigger condition: 'when the work is done'. That is real when-to-use guidance for a cleanup tool. It does not address edge cases such as whether it is safe to call if no session was opened, but no plausible alternative tool competes with it.

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