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

With no annotations, the description carries the full burden and does so well: it discloses auto-derived values (grossAmount from principal+entryFee, auto-computed carry), the side-effect difference between 'linked' (sum must equal lpNetAmount) and 'out_of_wallet' (no effect on bank balances or cash-flow charts), error behavior (clear ValidationError on invalid combos), and override escape hatches. This is materially beyond what the schema alone conveys.

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?

Long but well-structured: the purpose and hard prerequisites are front-loaded, then bulleted per-type rules, then the cashFlowMode and carry semantics. Every section carries non-redundant information; the density is justified by the 11-parameter, 7-type surface.

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 output schema and no annotations, the description covers prerequisites, per-type requirements, side effects, and error behavior thoroughly. The main omission is any hint of the response shape or whether the call is idempotent, but for a create tool with documented validation this is close to complete.

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 the baseline is 3, but the description adds real conditional semantics the schema cannot express: which fields are required per event type, that grossAmount must NOT be passed for initial_investment, and that transactionIds must only accompany cashFlowMode='linked'. Only minor gaps remain (e.g. quantityPct usage is only lightly touched).

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 ('Record an event on a venture deal'), which cleanly separates it from create_venture_deal, create_venture_platform, and update_venture_event. It doesn't explicitly name a sibling to disambiguate against, but the resource boundary is unambiguous from the name and opening sentence.

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 preconditions ('deal must already have an initial_investment before any other event type can be created') and a date-ordering constraint, plus per-type validity rules. It stops short of naming alternatives (e.g. when to prefer update_venture_event over creating a new event), so it lacks explicit exclusion guidance.

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