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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 Supersedes the withdrawn route-scoped design of PR #598; the decision record is .agents/notes/implemented/feature/2026-08-10-minimal-read-image-tool.md.
self-modification/ — the agent modifies its own runtime
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Model-facing tools over the live cordis runtime the agent itself runs inside: inspect the loaded plugins and service surface, mount model-written plugins, and dispose them again — plus the restricted repository Plugin runtime. Design home: the toolset Agent Note.
| Package | Role | ctx key |
|---|---|---|
tool-cordis/ |
Model-facing runtime inspection and temporary-plugin tools | registers on ctx.tools |
repository-plugin/ |
Repository skill and MCP composition | registers a Loader builtin |