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 Supersedes the withdrawn route-scoped design of PR #598; the decision record is .agents/notes/implemented/feature/2026-08-10-minimal-read-image-tool.md.
core/ — product API spine
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The session log, system-prompt assembly, tool registry, agent vocabulary, deployment-default model selection, and concrete loop that form the harness's default control spine. These are product packages — the stable surface plugins and consumers build against.
| Package | Role | ctx key |
|---|---|---|
scope/ |
Scoped-context registration primitive | library — no ctx key |
session/ |
Event-sourced session log and in-memory store | ctx.sessions |
system-prompt/ |
Prompt and tool-schema assembly registry | ctx.systemPrompt |
tools/ |
Scoped tool registry and execution pipeline | ctx.tools |
agent/ |
Agent interface, registry, and event vocabulary | ctx.agents |
agent-default-model/ |
Default model selection shared by Agent front doors | ctx.agentDefaultModel |
agent-loop/ |
Default concrete agent driver | ctx.agentLoop |
scope supplies the shared scoping primitive. agent owns the public contract, while agent-loop is its default implementation; extension plugins depend on the seam so the driver remains swappable. agent-default-model owns the deployment selection an Agent front door uses only when a session has no selection of its own.
Runnable compositions belong to examples/agent-spine-demo; this group owns only the swappable spine pieces.
The subsystem reference — the package-by-package loop map, the Agent handle and its delivery/interception contracts — is docs/subsystems/core.md; the default runnable composition is examples/agent-spine-demo.