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

No annotations are provided, so the description must carry the full burden. It discloses that bars are ascending by bar_ts and that missing bars are absent (honest gaps). However, it does not mention whether the tool is read-only, authentication requirements, or any side effects. Given the lack of annotations, this is adequate but not comprehensive.

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 a single paragraph that front-loads the tool's name, purpose, and key differentiating points. It is reasonably concise, but could be slightly tighter by removing the parenthetical note about ascending order, which is implied by 'timeline'.

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 an output schema, the description provides a good overview of the output structure (SLIM game tag, ascending order, honest gaps). It references another tool's schema for comparison, adding context. However, it does not explain pagination or the behavior of the 'limit' parameter, which limits completeness.

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 50%, and the description does not add any parameter-specific details beyond what is in the schema. For example, it does not explain the 'limit' or 'since' parameters or how they affect results. The description focuses on output structure rather than parameter usage.

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 it is a 'per-bar state timeline for a symbol/timeframe' and distinguishes itself from a sibling tool (decker.get_market_state) by noting a different schema (SLIM game tag vs full game block). The verb 'get' combined with 'state_timeline' makes the tool's purpose specific and actionable.

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 explicitly says to 'read status transitions across bars to see how the target game unfolded (forming → testing → resolved/failed)', providing a clear use case. It also notes that missing bars are absent, which guides interpretation. However, it does not explicitly state when not to use this tool or mention alternatives beyond the sibling comparison.

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