layout_open

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

Annotations already declare readOnlyHint=false, openWorldHint=true, idempotentHint=false, destructiveHint=false. The description adds real context beyond that: it creates a new browser tab (explaining the non-idempotent, state-creating behavior) and performs a load verification against the ID. It stops short of describing failure behavior or what is returned on a verification mismatch.

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?

A single front-loaded sentence with the verb first and no filler. Everything stated earns its place, though the terseness means it conveys little additional guidance.

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 3-param, open-world mutation with no output schema, the description covers the action and verification but omits what the tool returns (e.g. the opened tab ID or pass/fail status) and what happens when verification fails. The mismatch-stop behavior lives only in the schema, so an agent's picture of outcomes is incomplete.

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 67% (layout_id lacks a description but has a pattern). The description clarifies layout_id as an 'exact saved' ID and frames expected_layout_id as the verification target, adding modest meaning, but the schema already documents target_id and expected_layout_id. Baseline 3 fits when the schema carries most of the load.

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 states a specific verb and resource ('Open an exact saved TradingView layout ID') plus mechanism ('in a new browser tab') and a verification step. It is clearly a layout load-and-verify operation, distinguishable from generic browser_open_tab or layout_get. It doesn't explicitly contrast with pane_set_layout, which also applies layouts, so it's not a full 5.

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 word 'exact' implies usage (when you need to open a precise known layout ID), and 'new browser tab' implies the side effect. But there is no explicit when-to-use/when-not guidance or named alternative (e.g. pane_set_layout, browser_open_tab), so usage is only implied.

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