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Sweep 22 Sep 2026 · 17:19Z Build v2.1.280 501 read Stable v2.1.267 Latest v2.1.280 Next v2.1.280 Feeds RSS JSON llms.txt Unofficial
Claude Code v2.1.265 ·

Static system prompt mode (tengu_carved_slate) strips dynamic content from agent prompts when on

A new staticSystemPromptEnabled flag can strip dynamic content from agent system prompts

TierNothing to try yethow much it should matter to you
Useful3my rating, 1 to 5
Signal3worth watching, 1 to 5
AreaSystem Promptwhat it touches
KindIn Developmentin v2.1.265,
Nothing to try yet Notable No documentation found

A new staticSystemPromptEnabled flag can strip dynamic content from agent system prompts

What

A new setting, staticSystemPromptEnabled, when turned on, changes how the system prompt (the instructions given to an agent before a conversation starts) is built for both the general-purpose agent and the main session. When enabled, the prompt builders skip generating dynamic sections, such as the call that gathers environment information and the block that reports the platform version, producing a more static, fixed prompt instead.

Why

Skipping dynamic content makes the system prompt more predictable and reusable, which can help in cases where a fixed prompt is preferred over one that changes based on environment details. As of this release the setting has not been read as on for this site's account or the anonymous baseline.

Read from
Names in the bundlestaticSystemPromptEnabled
Feature flag
tengu_carved_slate Not enough to say

Nothing here resolved what this flag was doing on this version, so nothing here should be read as on or off.

This account: no value returned · anonymous baseline: on · compiled default in v2.1.265: not a boolean we can read

Read once, for one account on one subscription tier, against v2.1.265. It isn't a statement about your account. What a flag value here can and cannot tell you

See this entry in the whole of v2.1.265 →

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