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get_cookies

Retrieve cookies from the connected Chrome/Chromium browser to inspect session state, authentication, or test data during automation.

Instructions

Get Cookies (alias)

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv4.3.0

TDQS

D1.9/5.0
Behavior1/5

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

No annotations are provided, so the description carries the full burden of behavioral disclosure, and it delivers nothing: no indication that this is a non-mutating read, no description of the returned cookie structure, no scope (current page vs. all domains).

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?

It is short, but this is under-specification rather than conciseness — two words that add no information beyond the tool name. Length is not earned by value here.

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?

For a zero-parameter getter with no output schema, an agent still needs to know what the cookie data looks like and which cookies are returned; the description supplies none of that. The definition is functionally incomplete even for a simple tool.

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

Parameters4/5

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

The tool takes zero parameters, so by the rubric baseline is 4; there is nothing for the description to clarify about inputs.

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

Purpose2/5

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

"Get Cookies" merely restates the tool name get_cookies with no added specificity; the parenthetical "(alias)" is noise rather than a distinguishing detail. It does convey a verb+resource, but offers zero differentiation from the sibling tools cookies, set_cookie, and clear_cookies.

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

Usage Guidelines1/5

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

No usage guidance whatsoever — nothing about when to call this versus the sibling cookies tool, set_cookie, or clear_cookies. The agent is left to infer intent purely from the name.

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