Fix DeepSeek Harness MCP Connection Errors
An MCP failure can come from the server command, transport, environment, protocol startup or a profile patch. Disable the failing row to recover the session, run the server command independently, and re-enable one known server only after it starts cleanly. This page separates verified behavior from community reports and marks the release-candidate context so you can act without mistaking an observation for a permanent guarantee.
What is verified now
An MCP failure can come from the server command, transport, environment, protocol startup or a profile patch. Disable the failing row to recover the session, run the server command independently, and re-enable one known server only after it starts cleanly.
Evidence basis: Official Discussion #522 + official MCP docs. The status was checked on 14 August 2026; re-check the linked source after any dsh release.
Safe workflow
Use the smallest reversible workflow first. Do not add community plugins or paste credentials while validating the base behavior.
- Copy the exact error and record OS, Node and dsh versions.
- Apply the narrow checks on this page in order.
- Verify with a minimal profile and escalate with sanitized logs if it persists.
Verify before moving on
A successful result should be observable: a version string, reachable local URL, valid provider response, loaded configuration, or disappearance of the exact error. If the result differs, stop and capture sanitized evidence rather than stacking unrelated fixes.
- Record the exact dsh, Node or Python version.
- State the operating system and installation method.
- Link the first-party source and include only sanitized logs.
First-party sources
Open the original source before acting on a changed version or unresolved community report.