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Modify request

add_modify_request_rule

Rewrite request headers or body by specifying a URL pattern and HTTP method. Modify, remove headers, or replace body content to alter outgoing requests.

Instructions

Rewrite headers/body on matching requests, then pass through.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
methodNoHTTP method to match (GET, POST, ...). Omit = all methods.
setHeadersNo
urlPatternNoRegExp source matched case-insensitively against the full request URL.
replaceBodyNo
removeHeadersNo
Behavior2/5

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

No annotations provided. Description lacks details on side effects, conflict resolution between setHeaders and removeHeaders, or behavior when multiple rules match. Needs more disclosure for a mutating tool.

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?

Single sentence, no waste. Front-loaded with verb and resource.

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?

No output schema, no annotations, 5 parameters including complex ones. Description omits ordering, conflict resolution, and behavior on non-match. Incomplete for tool complexity.

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

Parameters2/5

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

Schema description coverage is 40% (2/5 parameters described). Description adds little beyond schema: only mentions 'headers/body', not detailing each parameter. Does not compensate for low coverage.

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

Purpose5/5

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

Description clearly states verb 'rewrite' on resource 'matching requests', and 'pass through' indicates non-blocking behavior. It distinguishes from siblings like add_redirect_rule or add_error_rule.

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

Usage Guidelines3/5

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

Implied usage from context: use for modifying headers/body. No explicit when/when-not or alternatives compared to other rule tools.

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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