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How to recover Web startup when one corrupt Session blocks it with DeepSeek Harness Handbook

Isolate the one bad Session artifact so the Web client starts without touching healthy Sessions.

Credentials. Session logs can contain sensitive workspace data, so keep them local and do not share them publicly while you debug.

Who it is forA Windows operator whose DeepSeek Harness Web client will not start after a plugin tree load failure.

The problemA single corrupt Session can stop startup, and editing the launcher or profile first can hide the real cause.

The outcomeThe bad artifact is isolated, the Web client starts again, and the healthy Sessions are unchanged.

What you need first

  • A DeepSeek Harness setup you run yourself
  • Browser access to the handbook site and its GitHub pages
  • The exact DSH version and source revision you are running

Steps

  1. Open docs/en/troubleshooting/session-history-corruption-triage.md and confirm your error matches a plugin tree failed to load message.
  2. Identify the one Session artifact the guide says may hold a bad Zstandard header.
  3. Isolate that artifact before you change the launcher, the profile, or any other Session.
  4. Start the Web client again and check that it loads.
  5. If startup still fails, keep the evidence and follow the handbook's failure router at https://sandbaseai.github.io/deepseek-harness-handbook/diagnose.html.

Prompt for your agent

Using the sandbaseai/deepseek-harness-handbook troubleshooting guide session-history-corruption-triage, help me with this startup error: <error text>. Identify the single Session artifact to isolate, and output the steps in order without changing the launcher or profile. Verify the Web client starts and that no healthy Session was altered.

Caveat. The guide describes a Windows failure pattern, so confirm your error text matches it before isolating any artifact.

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