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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.248 27 Aug 2026

Turning off large MCP output files now requires an exact value

Use it now

Useful3 Signal2

MCP Notable not in their notes

Only an exact false now disables large MCP output files; other values no longer switch it off.

ENABLE_MCP_LARGE_OUTPUT_FILES

What

ENABLE_MCP_LARGE_OUTPUT_FILES is now compared strictly against false rather than parsed for truthiness, so only a value that reads as exactly false disables persisting oversized MCP results and forces truncation instead. Other values no longer accidentally switch it off.

Details

The telemetry reason string for the disabled case is unchanged.

Evidence

env_disabled

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.248 →