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

Annotations already declare destructiveHint=true, idempotentHint=true and readOnlyHint=false, so the safety profile is covered. The description adds genuinely new context beyond that: the downstream effect ('Later videos leave it out') and the cost ('Free: no credits'). It does not state whether the removal is recoverable, but the added effect and pricing info go beyond the structured fields.

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 with zero waste; the core action and its id source are front-loaded, with effect and cost as supporting detail. Nothing could be removed without losing information.

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 explained, and the destructive idempotent nature is covered by annotations. What remains thin is the absence of any irreversibility or recovery note for a destructive operation, though the coverage is otherwise adequate for a one-parameter tool.

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 description coverage is 100% and the single memory_id parameter is fully documented in the schema with a reference to list_memory. The description mentions the same source but adds no format or syntax detail beyond it, so the baseline 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?

States a specific verb (forget) and a precisely scoped resource (one remembered preference by its id from list_memory), which cleanly distinguishes it from the sibling remember (adds a preference) and list_memory (enumerates ids). It stops short of naming remember as the inverse operation, but the resource 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 phrase 'by its id from list_memory' implicitly tells the agent to source the id from the sibling list_memory tool first, which is useful routing. However there is no explicit when-to-use or when-not-to-use guidance (e.g., preferring disable over delete, or that this is irreversible).

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