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skylarbarrera

react-devtools-mcp

override_hooks

Modify React component hook values during debugging to test different states and behaviors in development.

Instructions

Override a hook value on a function component

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
idYesElement ID
hookIndexYesHook index
pathYesPath within hook value
valueYesNew value
Behavior2/5

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

With no annotations provided, the description carries full burden for behavioral disclosure. 'Override' implies a mutation operation, but the description doesn't disclose whether this requires specific permissions, whether changes are reversible, what happens to the original hook value, or any rate limits/constraints. For a mutation tool with zero annotation coverage, this is a significant gap.

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

Conciseness5/5

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

The description is a single, efficient sentence that gets straight to the point with zero wasted words. It's appropriately sized for the tool's complexity and front-loads the essential information.

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 mutation tool with no annotations and no output schema, the description is inadequate. It doesn't explain what happens after the override, what the expected outcome is, whether there are side effects, or how this interacts with the component lifecycle. Given the complexity of hook manipulation and the lack of structured data, the description should provide more context.

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

Parameters3/5

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

Schema description coverage is 100%, so the schema already documents all four parameters with basic descriptions. The description adds no additional parameter semantics beyond what the schema provides - it doesn't explain what 'hookIndex' means in practice, how 'path' works with hook values, or what types of 'value' are acceptable. Baseline 3 is appropriate when schema does the heavy lifting.

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

Purpose4/5

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

The description clearly states the action ('Override') and target ('a hook value on a function component'), providing a specific verb+resource combination. However, it doesn't distinguish this tool from sibling tools like 'override_context', 'override_props', or 'override_state', which all perform similar override operations on different aspects of components.

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

Usage Guidelines2/5

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

The description provides no guidance on when to use this tool versus alternatives. There's no mention of prerequisites, when this operation is appropriate, or what distinguishes it from other override tools in the sibling list. The agent must infer usage from the tool name alone.

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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