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1861a3fc7c
The model reads a PNG/JPEG/WebP/GIF file, the bytes commit through the durable attachment lifecycle, and the tool result carries the real ImageBlock so the image enters context from the next request onward. FileSystem gains a bounded readBytes primitive (local + E2B providers); registration is conditional on the attachment store, and a strict execution gate refuses routes that do not declare image input, so a text route's durable history stays free of image blocks. llm-replay models may declare inputModalities, letting keyless ACP snapshots pin both the sha256-referenced success and the verbatim refusal. Supersedes the withdrawn route-scoped design of PR #598; the decision record is .agents/notes/implemented/feature/2026-08-10-minimal-read-image-tool.md.
context/ — request-context extensions
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Product plugins that add model-visible request context without defining a tool. workspace-context is included by the default dsh-agent-spine-demo bundle and can be disabled through bundle config; time-context, tmux-context, and session-reference are opt-in.
| Package | Role | ctx key |
|---|---|---|
session-reference/ |
Bounded snapshots of other sessions | ctx.sessionReferences |
time-context/ |
Current-time and elapsed-time context | — |
tmux-context/ |
tmux location context | — |
workspace-context/ |
Workspace-instruction context | — |
Session references are documented in docs/subsystems/session-reference.md; the workspace-context decision record owns its per-agent/session isolation and lifecycle split.