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* fix(vision): preserve high detail for inline images * fix(vision): scope high-detail image default to OpenCode clients defaultImageDetail() was applied at prepareUpstreamBody, the shared upstream-body prep path for every provider and format, not just the OpenCode path the fix targets. Gate it on isOpencodeClient (the existing User-Agent/x-opencode-* header signal already used for bypassDefaultToolLimit at this call site) so non-OpenCode callers keep the provider's own image detail default. Adds a regression test covering a non-OpenCode caller against the same opencode-zen provider. * fix(vision): document and test the global vs OpenCode-only detail scope The OpenCode-only high-detail default in chatCore/upstreamBody.ts (defaultImageDetail, gated on isOpencodeClient) forwards the caller's own image_url.detail and was already correctly scoped in a prior commit on this branch. The internal vision-bridge describe self-loop (visionBridgeHelpers.ts) is architecturally global: VisionBridgeGuardrail runs for every caller/provider whenever the target model lacks vision support, and there is no client-identity signal at that layer to gate on. Its describe prompt explicitly asks the vision model to transcribe visible text, so requesting "high" detail unconditionally is justified on its own merits (OCR accuracy), independent of the OpenCode motivation. Adds a compatibility assertion proving the Anthropic wire-format branch of the same describe self-loop carries no `detail` field (it has no such concept) and is therefore unaffected by this default, and documents the split (OpenCode-only forwarding vs. global describe default) in docs/security/GUARDRAILS.md. Co-authored-by: diegosouzapw <8016841+diegosouzapw@users.noreply.github.com> --------- Co-authored-by: rinseaid <rinseaid@rinseaid.net> Co-authored-by: diegosouzapw <8016841+diegosouzapw@users.noreply.github.com>