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Claude Code agents suffer session-bound 401 errors despite valid tokens

A user encountered persistent HTTP 401 errors with their headless Claude Code agent, despite the OAuth token being valid. The issue appears to be tied to the agent's server-side session identity rather than the token itself, causing the agent to remain latched in an error state until restarted. This behavior persists even with recent Anthropic client fixes for token refresh, as external probes for token validity are structurally blind to the session-bound error. AI

IMPACT This issue highlights potential reliability problems for long-running AI agents, impacting operational stability.

RANK_REASON User-reported issue with a specific product/service.

Read on dev.to — Claude Code tag →

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

Claude Code agents suffer session-bound 401 errors despite valid tokens

COVERAGE [1]

  1. dev.to — Claude Code tag TIER_1 English(EN) · Eric Lytle ·

    The token is valid — but your headless Claude Code agent just 401'd forever

    <p><strong>TL;DR:</strong> A static OAuth access token can return HTTP 200 on a raw <code>/v1/messages</code> call at the exact instant a long-running Claude Code instance using that <em>same token</em> gets 401 "Invalid authentication credentials" — because the rejection is boun…