Minimum-first framing: require two-tool trace plus no-auth fallback path; forced-failure handling is extension.

Day 1 · Block 4

Tools 1

Understand tool-calling loops and implement a small agent using multiple tools, with a no-auth local fallback path.

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Block Write-up

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Exercise overview: Tool-calling mini-agent

Inputs

• exercises/04/tool_agent.py
• Two tools: label lookup + average
• One multi-step question requiring both tools

Deliverable

tool trace with two tool calls + plausibility check + one TODO change note.

Target

Take a look at the LangChain documentation for tool use

Submission

• Use the live launcher: Live Exercises
• Direct prefilled form: E04 submission link

Checklist

• Make one explicit design decision.
• Include one verification check.
• State one limitation or risk.

Common failure modes

• Agent answers directly without using both tools.
• No no-auth fallback when external tool setup fails.

Extension task (optional)

Add graceful fallback for a forced tool failure and show fallback trace.