select_session
:
Instructions
Set the default session for subsequent commands
Input Schema
| Name | Required | Description | Default |
|---|---|---|---|
| sessionId | Yes | Session ID to make default |
:
Set the default session for subsequent commands
| Name | Required | Description | Default |
|---|---|---|---|
| sessionId | Yes | Session ID to make default |
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden. It mentions the persistence aspect (applies to subsequent commands) but omits other behavioral details like whether the setting persists across connections, if it's reversible, or whether it affects concurrent users. It meets minimum disclosure for stateful behavior.
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 exactly 7 words with zero redundancy. It is front-loaded with the action verb 'Set' and every word contributes essential meaning about the operation and its scope.
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?
Given the single parameter with 100% schema coverage and no output schema, the description adequately covers the basic operation. However, given the complex debugging context implied by 20+ sibling tools, it could benefit from noting that this eliminates the need to pass sessionId to other commands.
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 the sessionId parameter fully documented. The description adds contextual meaning by explaining the purpose of setting the session (making it default for subsequent commands), which helps the agent understand why to use this parameter, meeting the baseline for high-coverage schemas.
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 tool sets a default session and specifies the scope ('for subsequent commands'), distinguishing it from siblings like list_sessions (which only lists) and terminate_session (which ends sessions). However, it doesn't explicitly clarify the distinction from session-creating tools like launch or attach.
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 'for subsequent commands' implies when the effect takes place, suggesting it should be used before other operations requiring a session context. However, it lacks explicit guidance on when to use this versus creating a new session, and doesn't mention that it requires a valid sessionId from list_sessions.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
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