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

With no annotations, the description carries the full load and does well: it discloses that rule matching auto-adds transactions (a write side effect on other records), that AI mode scans a date range and produces suggestions, and what the call returns (tracker with ID, status, rule categories and tags). It stops short of stating permission requirements or what happens on validation failure.

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?

Four sentences, front-loaded with the core action and its scope, then behavioral modes, then the return value. Every sentence adds information; only the return-value sentence is slightly redundant with an obvious creation result.

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 12-parameter creation tool with no output schema, the description covers scope, mode flags, follow-up tools, and the shape of the returned object. Minor gaps remain around failure modes and default behavior of rulesCleanup, which only the schema explains.

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 coverage is 100%, so baseline is 3; the description earns above that by surfacing cross-parameter dependencies (rulesEnabled needs categoryIds and/or tagIds; aiEnabled requires aiDescription and startDate) that are easy to miss when skim-reading 12 properties. It does not add format or unit details beyond the schema.

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?

States a specific verb+resource ("Create a tracker") and immediately scopes it with the optional limit and date range. It also carves out the nearest ambiguous concept by declaring it does not create the period-based Budget plan, so an agent can separate it from budget-style tools without opening the schema.

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?

Gives concrete routing: use rulesEnabled with categoryIds/tagIds for auto-add, use add_transactions_to_tracker to link existing transactions, and use list_tracker_suggestions to review AI results. The only missing piece is an explicit statement of when not to call it (e.g. vs update_tracker for existing trackers), which is largely self-evident from the name.

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