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Composio

Customize tool schemas before agents see them

Composio’s schema modifiers let you rewrite a tool’s schema before it reaches an agent. Use them to adjust descriptions, add or hide parameters, and set defaults when the raw tool schema needs guardrails.

API
Chrome Extension
Integrations
B2B
For Developers
For Teams
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About

What It Is

Schema Modifiers are a Composio SDK middleware feature for developers building agents with external tools. They sit between your tool registry and the agent, letting you change how a tool appears before the model decides whether and how to use it.

What to Know

This is not a standalone agent product; it is a low-level customization layer for Composio tool schemas. It can help when an agent needs clearer instructions or when certain arguments should be required, removed, or given defaults, but it does not...

Key Features
Rewrites a tool’s schema before it is shown to an agent
Can modify tool descriptions to provide extra usage guidance
Can add new arguments to a tool schema
Can hide irrelevant arguments from a tool schema
Can set default values for tool arguments
Use Cases
Guide an LLM to use a default GitHub repository when listing issues
Remove unused parameters from a tool to reduce agent confusion
Make a key argument required so tool calls fail less often
Agenticness: Reactive Tool

Responds to prompts but takes no autonomous action.

High evidence
Last evaluated: Mar 28, 2026

Dimension Breakdown

Action Capability
Autonomy
Adaptation
State & Memory
Safety
How agenticness works →

Categories

Agent Infrastructure
Pricing

Pricing not publicly available

Details
composio.dev
AddedMarch 26, 2026
RefreshedMarch 28, 2026
Agenticness
Reactive Tool
Quick Facts
DeploymentCloud-hosted
AutonomyCopilot (human-in-loop)
Model supportMulti-model
Open sourceYes
Team supportIndividual only
Pricing modelFreemium
Interfaceapi
Sources
WebSchema Modifiers | Composio
WebDocumentation
Webcomposio on PyPI
Last updated April 3, 2026
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