66 lines
2.6 KiB
Markdown
66 lines
2.6 KiB
Markdown
# Constitution
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These invariants are durable project rules. Every future milestone change must
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state in its `design.md` how it preserves them.
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## Device Boundary
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`Driver` is the only device-capability contract. Concrete drivers translate
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external SDKs into that contract and do not own task, workflow, or planner
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state.
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Drivers are stateless with respect to agent tasks. A driver may hold a live
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connection handle, but task memory, retries, plans, and workflow state belong
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above the driver layer.
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## Tool Boundary
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`tools/` exposes device capabilities to the runtime. Tools call into
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device/driver capabilities through abstractions and never import a concrete
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driver such as `WDADriver`.
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## Perception Boundary
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`Scene` is the only perception artifact the LLM sees, with one narrow,
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explicit exception: the runtime-layer AI `Planner` (and only that Planner)
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may additionally receive the raw screenshot bytes for the current step,
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alongside `Scene`, to support vision-grounded decision-making. No other
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layer — `api`, `tools`, `perception`, `storage`, or any other LLM consumer —
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may receive raw screenshot bytes; every other perception consumer still
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receives `Scene` only. `Scene` itself is still produced exclusively through
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`PerceptionProvider`, not by direct calls to OCR, UI tree parsing, or
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`scene_builder` from runtime and API layers.
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## Runtime Boundary
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The Planner produces a plan. The Executor is the only component that calls
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tools and handles retries for tool execution.
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LLM dependencies enter at `runtime` through Planner behavior. HTTP and MCP
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dependencies enter at `api`. No LLM, HTTP, or MCP dependency may appear in
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`core`, `driver`, `device`, or `tools`.
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## Packaging Boundary
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The repository is a uv workspace with `device-agent-runtime` as the root
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member and outer platform packages as separate members. The cloud platform is
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owned by `packages/cloud-platform` and may depend on the Runtime through an
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explicit workspace source; the Runtime distribution must never depend on or
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package `cloud`.
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All Python members share the committed root `uv.lock`. Runtime is an
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in-process execution library; its operator evidence view is the authenticated,
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server-rendered Host Agent console rather than a separately packaged Runtime
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service. The unrelated `cloud-console/` Vue/Vite application keeps its own
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independent npm lifecycle.
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## Change Discipline
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Future changes must keep the dependency direction:
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`core` -> `driver`/`device` -> `tools` -> `perception` -> `storage` -> `runtime`
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-> `api` -> optional outer workspace applications.
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When a change needs a new external integration, add it at the adapter layer
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that owns that concern, not at the domain or device boundary.
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