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

With no annotations provided, the description carries the full burden, and it does disclose the temporal scope (current 0DTE session) and the specific data returned, including Spot, VWAP, GEX, gamma flip, IV rank, expected move boundaries, put/call walls, and trade flow. 'Retrieves' implies a read-only lookup, but there is no explicit statement about side effects, permissions, rate limits, or failure behavior. The return-field list and session scope are substantial behavioral context for a retrieval tool.

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 front-loaded with the retrieval action and then the returned data set, followed by a usage sentence. It is dense with enumerated fields but each listed field supports the tool's purpose and helps the agent understand what will be returned. There is little wasted wording, though the output list makes the first sentence long.

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?

Because there is no output schema, the description appropriately names the returned data points and specifies that they apply to the current 0DTE session. It also states the symbol scope and primary use cases. It does not cover error behavior or explicit read-only semantics, but for a one-parameter lookup tool it is largely 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?

The input schema already has 100% description coverage, including the symbol parameter's examples and default of SPX. The description adds that the symbol should be an index or ETF and repeats example tickers, but does not add materially more parameter behavior beyond the schema. A baseline 3 is appropriate when the schema already does the heavy lifting.

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: retrieves 8-point Market Microstructure and technical execution levels for a specific index or ETF for the current 0DTE session. It lists the returned fields, making the tool's purpose concrete. It does not explicitly name or differentiate against sibling tools such as get_expected_move or get_macro_thesis, so it falls short of a 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 description gives clear usage guidance: use when a user asks about levels, ranges, support/resistance, or setup viability for a specific symbol. It does not state when not to use the tool or name alternatives such as get_expected_move for a narrower expected-move query, so it lacks explicit exclusions.

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