session_start

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

Without annotations, the description must cover behavioral traits. It mentions returning a quick_start guide and the memory scope decision, but does not disclose side effects (e.g., session creation state), authorization needs, or idempotency. The behavioral disclosure is minimal.

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 short sentences plus an emphasized note. It front-loads the core action. Minor fragmentation but overall efficient.

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 lack of output schema, the description should elaborate on return value and side effects. It only vaguely mentions 'Returns quick_start guide' and fails to explain session lifecycle implications, making it incomplete for a session start tool.

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?

The schema coverage is 100%, and the description adds no extra meaning to the parameter beyond the schema's own description. Baseline score of 3 is appropriate as the description does not compensate further.

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's purpose: 'Signal session start and get initial context.' It uniquely identifies the action among siblings like 'session_end' and memory operations. The additional note about memory scope further specifies behavior.

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 gives a conditional instruction for when memory is empty, which helps in usage. However, it lacks explicit guidance on when not to use this tool or mention of alternatives. The context is generally clear for a session start tool.

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