session_connect

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

With no annotations provided, the description carries the full burden of disclosing behavior. It reveals the authentication mechanism (signs in as the person at the keyboard, with the program providing credentials or stored settings), explicitly states it cannot take a password, and mentions the possible NO_SETTINGS response with remediation steps. This goes beyond a generic 'sign in' and gives an agent actionable knowledge, though it does not describe the success output or side effects in detail.

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 front-loaded with the core purpose, which is good, but it becomes somewhat wordy with the repeated mention of passwords and the NO_SETTINGS explanation. It could be tightened to two concise sentences without losing meaning, but it is not excessively long.

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 simple sign-in tool with no parameters and no output schema, the description covers the essential context: what it does, how authentication works, and how to handle the NO_SETTINGS failure case. It references session_init as a prerequisite, which is helpful. It does not describe the success return value, but that is likely minimal for a session-establishment 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 tool has zero parameters, so the baseline is 4. The description reinforces this by explicitly stating 'Takes no arguments' and explains why (cannot take a password), adding meaning beyond the empty schema. This is sufficient for a no-parameter tool.

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 signs in to the active store (the one session_init marked), uses a specific verb and resource, and distinguishes itself from siblings by referencing session_init. It is not a tautology and leaves no doubt about the tool's role.

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 explains when to use the tool (to sign in to the active store) and gives context on how it works, including that it takes no arguments and cannot take a password. It also instructs on handling the NO_SETTINGS response, which is practical usage guidance. It doesn't explicitly compare to alternatives, but the reference to session_init and the emphasis on passwordless sign-in implicitly differentiate it from any password-based sign-in tools.

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