delete_playback_bookmark

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It does disclose the critical safety behavior: 'Preview by default — pass dry_run=false to delete.' This is valuable because it signals that the default invocation is non-destructive. However, it does not add much beyond the schema's dry_run parameter description, and it does not mention irreversibility, permissions, or what happens to the local backup file after deletion.

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?

The description is two sentences with no wasted words. The primary action and resource scope are front-loaded, and the critical preview-by-default behavior is stated immediately after. Every sentence 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?

The tool is simple, has only 3 parameters, and the schema covers all of them at 100%. The description provides the core action, scope, and safety behavior. A small gap is that it does not tell the agent to use list_playback_bookmarks to obtain valid bookmark IDs, but this is not essential for calling the tool correctly. Overall, the definition is sufficiently complete for a straightforward deletion operation.

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%, so the schema already documents all three parameters. The description reinforces the dry_run parameter's behavior ('Preview by default') but adds no new parameter-level meaning beyond what the schema provides. The baseline of 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 clearly states the verb 'Delete' and the specific resource: 'one captured playback bookmark file from the local backup dir.' It distinguishes this tool from related siblings like list_playback_bookmarks, capture_playback_position, and resume_playback_position by specifying exactly what is deleted and where.

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 implies when to use this tool: when the user wants to delete a captured playback bookmark file. However, it does not explicitly mention when not to use it or point to alternatives such as list_playback_bookmarks for finding bookmark IDs or resume_playback_position for restoring a bookmark. The preview-by-default guidance is useful but does not cover routing between related tools.

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