Add Tool

Name: Add Tool
Author: strands-agents

ASecurity

Add a custom function tool to a Strands agent in Python or TypeScript. Use when the user asks to let a Strands agent call application code, an API, or another deterministic capability.

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Added October 1, 2026

ai-agentstypescriptpythonapi

Works with

Security analysis

A100/100

Scanned October 1, 2026

npx -y skills add strands-agents/harness-sdk --skill add-tool --agent claude-code

Installs into .claude/skills of the current project.

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SKILL.md

---
name: add-tool
description: Add a custom function tool to a Strands agent in Python or TypeScript. Use when the user asks to let a Strands agent call application code, an API, or another deterministic capability.
---

# Add a tool to a Strands agent

Read [the shared Strands skill](../../SKILL.md) and [the tool guide](../../references/add-tool.md) completely.

Inspect the existing agent and implement one narrow tool with a model-readable description and typed input schema. Keep secrets and caller identity out of model-visible parameters. Test the deterministic capability directly, then exercise an agent request that requires the tool when model credentials are available.