Source Intelligence

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.

All of v2.1.247 Home All releases olderv2.1.246 v2.1.248newer
Claude Code v2.1.247

Gzipped request bodies for Remote Control traffic, off by default

Not switched on
Useful2 Signal3
Remote Control Notable not in their notes

Remote Control requests can be gzip-compressed, but it is switched off in this build.

Gzipped request bodies are compiled off behind tengu_gentle_hammock and can be forced with CLAUDE_CODE_GZIP_CCR_REQUEST_BODIES.

CLAUDE_CODE_GZIP_CCR_REQUEST_BODIEStengu_gentle_hammock
What

Requests to the Remote Control worker can now be sent with gzip-compressed bodies. It is decided by the flag tengu_gentle_hammock, which is compiled in as off, and can be forced either way with CLAUDE_CODE_GZIP_CCR_REQUEST_BODIES. It only applies on the Bun runtime, and only for string bodies of at least 1024 characters.

Details
  • Refusal reasons are recorded as env_off, not_bun_runtime, below_min_size and flag_off.
  • Proxies, mTLS, unix sockets and custom CA certificates all disable it.
  • The flag name does not exist in the previous release, so nothing turns this on unless the account's remote config serves it.
Usage
CLAUDE_CODE_GZIP_CCR_REQUEST_BODIES=1 claude
Evidence

CLAUDE_CODE_GZIP_CCR_REQUEST_BODIES, gzipRequestBodyFetch

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

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.247 →