Copilot engine: tool images never reach the model behind the API proxy

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调研方向

先阅读 src/services/credentials/copilot-credential-env.ts 中 API 代理环境设置附近的内容，然后查找 DefaultCopilotVersion 的定义和使用位置。检查现有的 Copilot 凭据环境和默认 CLI 版本行为测试。当 GitHub token 代理模式启用 vision，且 Copilot CLI 的默认版本至少为 1.0.106 时，即为完成。

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描述

awf community

Images from tools are dropped for every Copilot workflow that uses a COPILOT_GITHUB_TOKEN, so screenshot- and image-based workflows can't see anything.

Steps

  1. Commit any PNG as test.png.
  2. Add a workflow_dispatch workflow with engine: copilot and the prompt "Open test.png with the view tool and describe it."
  3. Set COPILOT_GITHUB_TOKEN, compile, and run.

Expected: the model receives the image and describes it.

Actual: the model says it can't see the image. On CLI 1.0.106 the view result is only Viewed image file successfully. (an image attachment was omitted from this request because image input is unavailable for the current model). On the default 1.0.103 the omission note is missing too. With COPILOT_PROVIDER_VISION: "true" in engine.env (CLI 1.0.106), the same run describes the image correctly.

Build: gh aw v1.0.1, Copilot CLI 1.0.103 (default) and 1.0.106, ubuntu-latest.

Cause: in API-proxy mode, AWF runs the CLI as an offline BYOK client pointed at the sidecar (copilot-credential-env.ts). The CLI treats BYOK models as text-only unless COPILOT_PROVIDER_VISION=true, which https://github.com/github/copilot-agent-runtime/pull/32179 added (CLI 1.0.106 and later; documented in copilot help environment).

Suggested fix: set COPILOT_PROVIDER_VISION=true alongside COPILOT_OFFLINE in GitHub-token mode, and move DefaultCopilotVersion to 1.0.106 or later.

Workaround:

engine:
  id: copilot
  version: "1.0.106"
  checksums-sha256: "5e8cf7427cc69cc757d1a08132dac0eb9e7f56c95d269ecbc06799686e996730" # SHA256SUMS.txt
  env:
    COPILOT_PROVIDER_VISION: "true"

Related: https://github.com/github/gh-aw/issues/74972, https://github.com/github/copilot-cli/issues/4600

🤖 Authored with GitHub Copilot on behalf of @rwoll.

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