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Dev Builds Tool to Use Claude Subscriptions in Pi Agent, Warns of Account Risk

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A developer has released an open-source extension called pi-sub-anthropic that allows the minimalist Pi coding agent to authenticate using a Claude Pro or Max subscription instead of a paid API key. Since April 4, 2026, Anthropic has enforced a server-side policy blocking third-party tools from using subscription OAuth tokens, returning billing errors for such attempts. To bypass this, the extension replicates Claude Code's network fingerprint, effectively presenting itself as Anthropic's own first-party client. The developer openly warns this may violate Anthropic's usage policies and that accounts could be suspended or terminated without notice. As a safer alternative, the tool also supports standard API key authentication, which the author explicitly recommends over the subscription workaround.

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