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

Beyond the annotations (readOnlyHint, destructiveHint, openWorldHint), the description discloses deployment requirements ('Requires signing in with a LuxAlgo account (OAuth)') and the full shape of the returned payload, including hidden fills and corrections. This is meaningful context the structured fields do not carry.

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 lead clause 'One trade in full' front-loads the essential point, and the usage instruction is placed last where it is easy to act on. The middle enumeration of returned fields is dense but every element is a real differentiator, so little is wasted.

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?

With no output schema, the description takes on the burden of explaining return values and does so in detail, while also covering prerequisites and auth. Nothing an agent needs in order to call it correctly is missing.

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%, with the key parameter already documented as returned by journal_list_trades/journal_get_day/journal_search_notes/journal_add_trade and the 'Never construct one' rule. The description echoes the sourcing hint but adds no new syntax or format detail, so the baseline 3 applies.

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 and resource ('One trade in full') and enumerates exactly what that means — summary fields, fills, per-exit gross P&L, hidden fills, and annotations. This clearly separates it from the list-oriented siblings journal_list_trades and journal_get_day.

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?

Explicitly says to use it after journal_list_trades or journal_get_day when the user asks about a specific trade, or before annotating it. That is clear contextual guidance, but it never states when not to use it or names a competing alternative tool to prefer.

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