vk_photos_get_by_id

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

The description only mentions 'Access level: read' but does not disclose other behavioral traits such as rate limits, authentication requirements, error handling, or what happens with invalid IDs. Since no annotations are provided, the description carries the full burden and falls short.

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 concise with two sentences. However, the second sentence listing metadata (API method, tool name, section, access level) could be integrated or omitted if redundant. Still, it is not overly verbose.

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?

With no output schema, the description does not clarify the return value structure or fields. It also lacks context on typical usage scenarios, such as when to use extended or photo_sizes parameters. The description is minimally complete.

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%, with detailed descriptions for each parameter (e.g., photos format, extended, photo_sizes). The description adds no further meaning beyond the schema, so 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?

Description clearly states the tool returns information about photos by their IDs, using the VK API method photos.getById. This is specific and distinct from sibling tools like vk_photos_get or vk_photos_search.

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?

No guidance is provided on when to use this tool versus alternatives. The description merely repeats the tool name and API method, without explaining the context or circumstances that favor this tool over others.

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