The SDK is the software development kit for running Claude Code from your own programs. When Claude is thinking, it produces a thinking block, which is its written reasoning. If that block is cut off before it finishes, Claude Code can now rebuild it from the partial text and send it with the next request. It sends the text with an empty signature and records that this happened.
This only happens when all of these are true:
- The block is a thinking block
- The session was started through the SDK
- A remote switch is on; it is off unless it is switched on remotely
The flag server returned off for this site's account and for the anonymous baseline.
An SDK session interrupted mid-thought could keep its partial reasoning in the next request instead of losing it.
tengu_velvety_galaxy Off in both readingsThe flag server returned off for the account this site reads and for the anonymous baseline. A reading of off cannot rule out a rollout these two readings sit outside of.
This account: off · anonymous baseline: off · compiled default in v2.1.321: off
These values were read against a different version of Claude Code, so treat them as the nearest reading available instead of one taken on this release.
Read once, for one account on one subscription tier, against v2.1.321. It isn't a statement about your account. What a flag value here can and cannot tell you
A reading is one sample. Claude Code evaluates its flags remotely, so no client sees the targeting rule behind a value and this says nothing about your account.
New in this build: tengu_velvety_galaxy