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grahammccain

Chart Library

similar_cohorts

Read-onlyIdempotent

Find historically similar chart patterns for a stock on a given date. Uses pre-computed embeddings to return top matching cohorts.

Instructions

[DEPRECATED in v5 — use search(mode="similar", symbol=..., date=...)]

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
symbolYes
dateYes
timeframeNo1h
top_kNo

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior2/5

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

Annotations already indicate read-only, idempotent, etc. The description adds no behavioral context beyond deprecation; it doesn't describe side effects, permissions, or return behavior.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness2/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single sentence, but it omits essential context about what the tool itself does. Being too sparse is not the same as being concisely complete.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given 4 required/optional parameters and a rich annotations set, the description is insufficient. It fails to explain the tool's behavior, return values, or parameter specifics, leaving an agent with only a deprecation warning.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters1/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0%. The description provides no meaning for the 4 parameters; it only mentions symbol and date in the replacement hint, but no detail on their purpose or format.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose1/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description does not state what the tool does; it only marks the tool as deprecated and redirects to another function. There is no verb or resource indicating the original purpose.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Clearly tells agents not to use this tool and provides an explicit alternative: use search with specific parameters (symbol and date).

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

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