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Bug Report Example

This is a filled-in example of the bug report template to show what a good bug report looks like.

Title: Executor skips steps when upstream step returns empty string

What happened?

I have a custom tool that returns an empty string "" as a valid result. Steps that depend on it get skipped with "upstream failure", even though the tool completed successfully. The pipeline finishes with status: "pass" but the output is incomplete because the downstream steps never ran.

Reproduction

import { Tepa } from "@tepa/core";
import { AnthropicProvider } from "@tepa/provider-anthropic";
import { defineTool } from "@tepa/tools";

const emptyTool = defineTool({
  name: "return_empty",
  description: "Returns an empty string",
  parameters: {},
  execute: async () => "",
});

const tepa = new Tepa({
  provider: new AnthropicProvider(),
  tools: [emptyTool],
});

const result = await tepa.run({
  prompt: { goal: "Use return_empty tool, then summarize the result" },
});

// Steps after return_empty are skipped
console.log(result.outputs);

Environment

  • Node.js: 20.11.0
  • Packages: 
    my-project@1.0.0
├── @tepa/core@0.1.4
└── @tepa/tools@0.1.3
  • OS: Ubuntu 24.04

Logs (optional)

[cycle:1] Planner produced 2 steps
[cycle:1] Step 1/2: "call_return_empty" — status: success, output: ""
[cycle:1] Step 2/2: "summarize_result" — SKIPPED (upstream failure)
[cycle:1] Evaluator verdict: pass (confidence: 0.72)