join_simul

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

No annotations are provided, so the description carries full burden for behavioral disclosure. 'Join a simul' implies a write/mutation action but doesn't specify permissions required, rate limits, side effects (e.g., joining a game session), or what happens on success/failure. This leaves critical behavioral traits undocumented.

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 extremely concise at just three words, with zero wasted text. It's front-loaded with the core action, though this brevity comes at the cost of completeness.

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 no annotations and no output schema, the description is inadequate for a mutation tool. It doesn't explain what 'simul' means in this context, what joining entails, possible outcomes, or error conditions. For a tool that presumably modifies state, this leaves too many gaps.

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 description coverage is 100% (the single parameter 'simulId' has a clear description: 'ID of the simul'), so the schema does the heavy lifting. The description adds no additional parameter context beyond what's in the schema, meeting the baseline for high coverage.

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 'Join a simul' is a tautology that restates the tool name without adding meaningful context. It doesn't explain what a 'simul' is (presumably a simultaneous exhibition in chess) or what joining entails. While the verb 'join' is clear, the resource 'simul' is domain-specific and unexplained.

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?

No guidance is provided about when to use this tool versus alternatives like 'join_arena' or 'join_swiss' (both sibling tools). The description doesn't mention prerequisites (e.g., needing an active simul to join) or constraints (e.g., only for certain user types).

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