open_session

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

With no annotations, the description carries the full burden of behavioral disclosure. It mentions the return values and parameter override behavior, but does not disclose side effects of opening a session, whether resources are held, authentication needs, or the need to close the session to clean up.

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-sentence description is tight and front-loads the main action and return value. The second sentence adds a meaningful parameter detail without padding.

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 tool that opens a session in a larger pipeline, the description is incomplete: it doesn't mention lifecycle (close_session), whether opening is required before other tools, or what metadata is returned. It leaves the agent to infer important operational context.

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%, so the description must compensate. It does clarify that params overrides the source's defaults and directs the agent to list_sources, but it does not explain the source parameter's possible values or how params maps to options.

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 clear verb ('open') and resource ('recording session') and states the return value (session_id and metadata). It doesn't explicitly contrast with siblings like close_session or get_session_info, but the action is distinct enough.

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?

It says params overrides source default_params and points to list_sources, which implies how to set up a session. However, it doesn't say when opening is appropriate, whether it is a prerequisite for other tools, or when to prefer close_session/get_session_info instead.

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