Version: 2026.4.15

Provider/model: anthropic / claude-opus-4-7 (direct API key auth)

What happens

When you paste a screenshot into the webchat composer, the image preview appears correctly above the text box. After sending, the image briefly appears in the chat but then disappears. The message reaches the agent as text-only — no image, no error, no indication anything was lost.

What I expected

The image to be passed to the model, same as it is on claude-sonnet-4-6.

Reproduction

1. Configure agents.defaults.model.primary as anthropic/claude-opus-4-7
2. Open webchat, paste a screenshot (Ctrl+V) into the composer
3. Send — image vanishes from the chat history, agent responds as if no image was sent

Switching to anthropic/claude-sonnet-4-6 resolves it immediately — same setup, same browser, paste works fine.

Root cause (traced)

resolveGatewayModelSupportsImages in session-utils looks up the model in the gateway catalog to check for input: ["image"]. The catalog (populated from the Pi SDK model registry) includes entries for claude-opus-4-5, claude-opus-4-6, claude-sonnet-4-6 etc — but not claude-opus-4-7. When the lookup finds no entry, the function falls through to return false, causing parseMessageWithAttachments to silently drop all attachments.

The log line confirms it: parseMessageWithAttachments: 1 attachment(s) dropped — model does not support images

The claude-cli provider already has a name-based fallback for exactly this scenario. The anthropic provider does not.

Suggested fix

Add anthropic to the name-based fallback alongside claude-cli:

- if (normalizedProvider === "claude-cli" && normalizedCandidates.some(...))
+ if ((normalizedProvider === "anthropic" || normalizedProvider === "claude-cli") && normalizedCandidates.some(...))

And add claude-opus-4-7 to the Pi SDK model catalog with input: ["text", "image"].