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Claude Code system prompt blocking and OpenClaw fingerprinting classifier

April 5, 2026Alex Volkov (Thursd/AI), Jeremy Nguyen

Alex Volkov and Jeremy Nguyen describe Anthropic blocking OpenClaw's exact system prompt and denying requests that resemble OpenClaw, implying prompt fingerprinting and enforcement that can be bypassed with tiny prompt changes.

Anthropic folks likely build a classifier for @openclaw systemprompts
So even asking your Claude code via CLI to act as Openclaw gets a request deny.
Anthropic now block OpenClaw's exact system prompt even when you use claude -p
Alex Volkov (Thursd/AI)
Jeremy Nguyen
openclawsystem promptcliclaudeanthropicclisystem prompt

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