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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 v2.1.257 ·

New system prompt snapshot plumbed into MCP/tool context

The tool and agent context now exposes a snapshot of the system prompt in effect alongside the appended one.

TierUnder the hoodhow much it should matter to you
Useful3my rating, 1 to 5
Signal3worth watching, 1 to 5
AreaSystem Promptwhat it touches
KindInternal Changesin v2.1.257,
Under the hood No documentation found

The tool and agent context now exposes a snapshot of the system prompt in effect alongside the appended one.

The tool/agent context builder now exposes a systemPromptSnapshot alongside appendSystemPrompt, capturing the exact system prompt in effect at a point in time.

Read from
Names in the bundlesystemPromptSnapshot

See this entry in the whole of v2.1.257 →

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