feat(agent): scaffold the Beyond agent harness core#5
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Add two workspace crates that lay down the harness, modeled on Pi (badlogic/pi-mono) and ported to Rust: - beyond-ai-agent-core (lib `agent_core`): runtime- and network-agnostic core. The dialect-agnostic message model (Role/ContentBlock/Message/ ToolDef/StreamEvent/StopReason), the `Tool` + `ToolRegistry` extensibility seam, the `ModelTransport` network seam, `Session` state, and errors. No HTTP/provider/executor code, so it unit-tests with no network. - beyond-ai-agent (bin `beyond-ai-agent`): thin CLI shell. Targets the one-shot `run` and headless `serve` surface (both scaffolded); `tools` is a working no-network demo of the registry + async tool seam. The Beyond twist: the model layer never manages provider keys/endpoints — it speaks OpenAI/Anthropic wire to the gateway. The agent crate has no dependency on the gateway crate; its only contract is the HTTP wire. Workspace: add `async-trait` + `futures` to [workspace.dependencies] (gateway's async-trait now inherits from the workspace). mise: build:agent, run:agent, test:unit:agent. Verified: build · clippy -D warnings · cargo fmt --all --check · dprint check · 9 agent-core unit tests · gateway 99 unchanged · `beyond-ai-agent tools` demo. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This was referenced Jun 30, 2026
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What
First slice of the agent harness — M1. Adds two workspace crates modeled on Pi (
pi-agent-core+ the dialect half ofpi-ai), ported to Rust:beyond-ai-agent-core(libagent_core) — runtime- and network-agnostic core:message— the dialect-agnostic conversation model (Role,ContentBlock,Message,ToolDef,StreamEvent,StopReason). One internal representation; wire adapters (next milestone) map it to/from OpenAI & Anthropic shapes.tool— theTooltrait +ToolRegistry. The extensibility seam: core tools (Read/Write/Edit/Bash) and Beyond primitives (fork/sync/logs) are all just registered tools.transport—ModelRequest+ theModelTransportseam. The loop depends only on this; the real gateway client and the testMockTransportboth implement it.session,error—serde-able run state; loop vs. tool errors.beyond-ai-agent(bin) — thin CLI shell exposing the eventualrun(one-shot) andserve(headless control API) surface. Both scaffolded;toolsis a working no-network demo proving the registry + async tool seam link end-to-end.The Beyond twist
The model layer never manages provider keys/endpoints — it speaks OpenAI/Anthropic wire to the gateway, which owns routing/auth/metering. The agent crate has zero dependency on the gateway crate; its only contract is the HTTP wire.
Out of scope (next milestones)
Wire dialect adapters (M2), HTTP-to-gateway transport (M3), the agent loop (M4), real tools (M6),
servecontrol API (M7). Therun/servecommands print a scaffold notice for now.Verification
cargo build·clippy --all-targets -D warnings·cargo fmt --all --check·dprint check· 9 agent-core unit tests · gateway 99 unchanged ·cargo run -p beyond-ai-agent -- toolsruns the demo. Added crates pinned to latest published (async-trait0.1.89,futures0.3.32).🤖 Generated with Claude Code