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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is covered externally. The description adds only the REST route, which is redundant metadata rather than behavioral context — nothing about ownership/access requirements, whether a missing ID errors versus returning empty, or what the session payload contains.

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?

Two short fragments, front-loaded with the action, with no filler. The appended HTTP path is marginally useful for humans but is largely redundant with the tool name.

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 lookup tool with zero schema descriptions and no output schema, the description leaves too much open: no indication of the returned session shape, no ID format, no access constraints. It is callable but under-specified.

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 0% on the single 'id' parameter, so the description must carry the load. Phrasing it as 'by ID' does establish that the argument identifies the LLM session specifically (rather than a user or folder), which is meaningful, but no format, source, or constraint is given.

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 names a specific verb and resource ('Get LLM session by ID'), so the operation is unambiguous. It does not, however, differentiate itself from close siblings such as get_strategy_llm_session (list), get_public_llm_session, or get_strategy_llm_session_folder_id, which matters in a namespace this crowded.

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?

There is no when-to-use guidance, no statement of prerequisites, and no mention of alternatives. The agent is left to infer that this is the single-item fetch versus the list-oriented sibling.

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