| Filename | Latest commit message | Latest commit date |
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be643d1202
jcp-schema's `Grant` gained `budget_funds` and `caveats` when JCP picked up dual ceilings, which left every Grant literal outside jcp-rs failing to compile. Fills them in across jouleclaw-jcp, mesh and joule-ui. All six are root grants (`parent: None`), so the joules-only values are the correct ones: no money ceiling, no caveats. Inheritance is not in play here -- that only applies to delegation, where jcp-grant deliberately clones the parent's `budget_funds` and `caveats` rather than defaulting them. An empty caveat list is omitted from the canonical encoding, so these grants stay byte-identical to the ones minted before the field existed. Co-Authored-By: Claude Opus 5 <[email protected]> |
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| .. | ||
| conformance | ||
| joule-ui-rs | ||
| LICENSE | ||
| README.md | ||
| SPEC.md | ||
joule-ui
A typed declarative protocol for agent-emitted user interfaces.
joule-ui is the sibling to JouleClaw for the moment when an
agent's resolution has to become something a human can see and interact
with. The agent emits a widget tree — (name, props, children),
recursively — against a widget registry the host has published. The
host renders. No React in the spec, no HTML over the wire, no agent
holding the renderer.
The shape the field has converged on for this is declarative components against a registry: agents are far more reliable emitting structured data than emitting code, and renderers are far easier to harden when they own their own widgets. joule-ui pins that shape as a protocol; the renderer is product surface, owned by the consumer.
What ships in v1
-
joule-ui-rs/crates/joule-ui-core/— the protocol types (Widget,PropValue,WidgetSchema,Registry) and the recursive validator. Pure Rust, no IO, JSON-serialisable. -
joule-ui-rs/crates/joule-ui-interaction/(v0.2) — the layer no other UI protocol carries: when a human or an agent fires anAction, the invocation is an accountable event. Every fire names the principal that made it — adid:key, the same whether a person or an agent (the protocol draws no distinction; both are traced).run_interactionauthorizes it against a capability before it runs (a denied action's handler never executes), meters it in joules, charges the measured cost, and anInteractionLogseals it as the next link of a hash-chained receipt. The actor is bound into the signed core, so an interaction cannot be re-attributed without breaking the chain. A joule-ui session becomes a tamper-evident ledger of who fired it, what it computed, and what it cost — verifiable by anyone holding the host's key. The metering (SandboxPowerMeter) and the capability (JCP grant) are recognized edges; the receipt, the chain, and the lifecycle are joule-ui's. SeeSPEC.md§5–§7 andexamples/metered_surface.rsfor the full loop.
The surface layer makes joule-ui a peer of the declarative-UI protocols (A2UI, MCP Apps). The interaction layer makes it the only one you can hand to an auditor: a UI whose every interaction is energy-accounted and sealed, by construction.
What is not here:
- A renderer. The renderer is owned by the host (browser app, native shell, terminal UI). joule-ui validates the surface and seals the interaction; it does not paint pixels.
- A transport. The validated spec and the interaction stream ride MCP, REST, SSE, gRPC, Web MoQ — any bytes-out protocol. Transport-agnostic.
- A "model emits React" path. The agent emits a declarative tree against the registry; arbitrary code emission is out of scope.
Why a sibling, not inside JouleClaw
The spec layer is protocol — small, stable, conformant. The renderer registry is product surface — many of them, evolving fast. Splitting them protects the tools for use line: JouleClaw stays the runtime substrate; joule-ui is the UI protocol; consumers ship their own widgets.
Licence
Specification text and protocol document: CC-BY-4.0 (see LICENSE).
Reference implementation in joule-ui-rs/: Apache-2.0.