TRON infrastructure for AI agents.

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

No annotations provided, so description carries full burden. Adds valuable auth context ('No MERX_API_KEY needed'). However, fails to disclose what successful login returns (session token, cookie, temporary access?), side effects, or security considerations (rate limits, lockout behavior) critical for authentication tools.

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?

Extremely compact two-sentence structure with no filler. Front-loaded with action. Secondary sentence provides useful authentication context. However, brevity comes at cost of missing behavioral details (output format) that would require third sentence.

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?

Adequate for basic invocation but incomplete for an authentication tool with no output schema. Missing critical information about return values (auth tokens, session identifiers) and state changes resulting from login.

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 has 100% description coverage for both email and password parameters. Description adds minimal semantic value beyond schema, only clarifying these are for a 'Merx account'. Baseline 3 appropriate when schema does heavy lifting.

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?

Clear verb 'Log in' and resource 'existing Merx account'. The phrase 'existing' effectively distinguishes from sibling 'create_account', and 'No MERX_API_KEY needed' distinguishes from 'set_api_key' and other authenticated tools.

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?

Provides implicit guidance via 'existing' (requires pre-registered account) and 'No MERX_API_KEY needed' (credential-based vs token-based). However, lacks explicit when-to-use (e.g., 'use when you have email/password but no API key configured') and mentions no prerequisites or alternatives.

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