fix(signal): stage inbound image attachments as base64 so the container can read them#2695

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fix(signal): stage inbound image attachments as base64 so the container can read them #2695
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cfis:fix/signal-inbound-image-base64

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@cfis

@cfis cfis commented Jun 6, 2026

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Type of Change

Fix — bug fix to source code

Description

The Signal adapter surfaces inbound images by emitting signal-cli's host attachment path (<signalDataDir>/attachments/<id>). The agent runs in a container that doesn't mount that path, so it can never read an image sent over Signal — the agent just gets an unreadable path.

Fix: read the attachment bytes and pass them as base64 data. The host's session-manager.extractAttachmentFiles already stages attachments carrying data into the session's mounted inbox/ and rewrites them to a container-readable localPath, which the agent-runner formatter surfaces as [image: <name> — saved to /workspace/inbox/...]. This matches how inbound attachments reach the container on other channels. Also drops the now-misleading host-path [Image: <path>] text line.

How it was tested: updated the inbound-image unit test to assert base64 data is forwarded (full Signal suite passes, 37/37). Verified end-to-end on a live install — an image sent over Signal now stages into the inbox and the agent reads and describes it.

🤖 Generated with Claude Code

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 fix(signal): stage inbound image attachments as base64 for the container

af96a93

The adapter emitted a host filesystem path (signal-cli's attachments dir) for
inbound images. The agent runs in a container that doesn't mount that path, so
it could never read the image. Read the bytes and pass them as base64 `data`
instead — session-manager.extractAttachmentFiles stages those into the session's
mounted inbox/ and rewrites to a container-readable localPath, which the
formatter surfaces as [image: <name> — saved to /workspace/inbox/...].