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Claude Code bug silently reported model call failures as successes

A bug in the Claude Code orchestrator's tool loop allowed model call failures, such as 404 errors, to be reported as successful operations. This occurred because the code path for "terminal" failures did not correctly flag errors, leading the parent orchestrator to interpret these failures as legitimate empty successes. The issue was resolved by adding an `isError: true` flag to the terminal failure branch, ensuring that such errors are now properly reported as failures. AI

IMPACT Ensures AI agents correctly report tool call failures, preventing silent errors from being trusted as successes.

RANK_REASON The item describes a bug fix in a specific code repository related to AI agent tool calls, not a general release or major product update.

Read on dev.to — Claude Code tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Claude Code bug silently reported model call failures as successes

COVERAGE [1]

  1. dev.to — Claude Code tag TIER_1 English(EN) · Enjoy Kumawat ·

    My Agent Said the Tool Call Succeeded. It Had 404'd.

    <p>I was debugging a GitHub issue in an open-source orchestrator repo: "subagent MODEL_CALL_FAILED gets swallowed." The reporter's repro was simple — point a subagent at an unresolvable model slug (a typo'd OpenRouter id), run the workflow, and watch the parent orchestrator repor…