[Bug] Anthropic API Error: Connection closed mid-response during security analysis—undiagnosable policy intervention

Bug Description
I run Claude Code (Fable 5) on my own codebase, a multi-dealer commerce platform. I asked it to run a routine security pass over MY OWN repo: access-control review, tenant-scoping, input validation on my own server actions. Standard defensive hardening of code I own and am authorized to The run died twice with "API Error: Connection closed mid-response" — both times at the exact moment the scan was about to persist its security findings to disk. That timing is not what a random network blip looks like. It looks like an intervention terminating the stream when security content is about to materialize. Two problems, and the second is the real one: 1. FALSE POSITIVE ON FIRST-PARTY DEFENSIVE WORK. The safeguard appears to key on security vocabulary (SSRF, auth-bypass, tenant isolation, PII) rather than intent or ownership. Reviewing and hardening your own authorized code is the single most legitimate security activity there is, and it's exactly the high-stakes reasoning I'm paying for Fable to do. Bouncing it is backwards. 2. IT'S UNDIAGNOSABLE. If a safety mechanism is terminating the response, surfacing it as "connection closed mid-response" is the worst possible failure mode. I can't tell a policy intervention from a transport error, can't appeal it, can't adjust, and waste tokens retrying something that was never going to complete. If the model won't do something, say so plainly with a reason. Don't dress a refusal up as an infrastructure fault. What I want: (a) ownership/intent context should gate this, not keyword matching — first-party authorized defensive work should pass; (b) if an intervention DOES fire, return an explicit, labeled signal, never a fake network error. Silent mid-stream termination that mimics a transport failure is unacceptable in a paid coding tool. This burned tokens, split my task across retries, and interrupted exactly the work Fable is best suited for.

Environment Info

• Platform: darwin
• Terminal: WarpTerminal
• Version: 2.1.226
• Feedback ID: e7d7bfab-455e-456a-9ee4-59e0c449d36a

Errors

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