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One pasted image and claude-opus-5 won't look at any more images

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評估

難度
4/5
預估耗時
3-5 天
新手友好度
48/100
Issue 類型
缺陷
描述清晰度
基本清楚
活躍度
活躍
技術堆疊
node.js, shell
領域
ai, cli

研究方向

使用版本 1.0.84-5 在 claude-opus-5 上重現該行為：貼上一張圖片，然後跨多個回合請求多個圖片檢視。檢查 prebuilds/darwin-arm64/runtime.node 中的 image_limit 值，並考慮報告中提到的 /model 或 /context 介面。當 image-limit 行為正確或獲得清楚呈現，且圖片檢視結果不再錯誤地顯示為成功時，即可視為完成。

由索引模型根據 Issue 內容生成。

描述

triage
Describe the bug

Pasted a screenshot into a session on claude-opus-5, and after that the agent couldn't view a single image file. Every view call came back with "You've reached the maximum number of images you can view (1)".

The CLI does say what happened:

Removed 2 images from the model request to stay within the model's 1-image limit. User-provided images were prioritized over tool-generated images, with newer messages kept first.

Fair enough as a message, but the result is that one screenshot early on burns the only slot and the agent is blind to images for everything after. Anything needing two images is off the table, like comparing a before/after render or checking a regenerated icon against the reference I just handed it.

Affected version

1.0.84-5

Steps to reproduce the behavior
  1. Start a session on claude-opus-5
  2. Paste an image
  3. Ask it to view two or more image files, same turn or any later turn
  4. Every one gets refused

I had it generate three solid-color PNGs and view them in one turn. All three blocked. Tried two more four turns later with no new image attached. Also blocked, so the original screenshot was still holding the slot.

One thing that makes this harder to notice: each call returns "Viewed image file successfully" and the limit message together, so at a glance it looks like it worked.

Expected behavior

A higher limit where the model can handle it, or some way for an old image to drop out instead of holding the slot indefinitely. If 1 genuinely is intended, surfacing it in /model or /context would help. Right now you only find out after the agent has already tried to look at something.

Additional context

macOS 26.6.2, arm64, Apple Terminal, zsh.

image_limit turns up as a string in prebuilds/darwin-arm64/runtime.node right next to Copilot-Vision-Request, so it looks like a per-model capability rather than anything I can set. Nothing image-related in ~/.copilot/settings.json or config.json.

The 1.0.84-5 changelog has this under fixed: "When image-heavy requests exceed model limits, user-provided images are prioritized over tool-generated images, newer messages are kept first, and the CLI reports any removals" (#19644). That's presumably what made this visible. No idea whether the limit of 1 is new or was just silent before.

What I didn't check: whether other models are also at 1, or whether the value changed recently. I only tested claude-opus-5 on this version. From inside a session I also can't tell whether it's the retained screenshot specifically or just a counter.

Closest existing issues I found are #3295, #4536 and #4600 (routing and MCP image results) and #965, #3767, #4183 (the 5 MB payload cap). Those look like different problems.

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環境準備

  • 沒有 Dockerfile 或 Docker Compose 檔案
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  3. Fork 儲存庫，在一個分支上完成修改。
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