Concepts

A set of engineering concepts pulled from the Dongfang Yiteng execution agent (case by Bo Liang).

Each entry makes one concept clear: what it is, which failure it prevents, when you need it. They cross-link into one engineering vocabulary for execution-type agents. The full case is the Dongfang Yiteng execution-agent blue book.

• Control/Narrative Dualism — Convert the live and uncertain into the dead and controllable first — the control plane is mechanized, the narrative plane is steered.
• Execution vs Content — If a one-digit error corrupts business data, it's execution-type; loose text passing that tolerates retries is content-generation.
• Separation of Powers — Three planes, each its own job: what the user wants and how far it got, where API params come from and whether they're right, which step runs and whether it's done.
• Mechanical State Plane — Business API inputs are not LLM-generated; every param has a unique, auditable, fail-fast mechanical provenance.
• Anchor · Ledger · Collection — Anchor the original goal, log key milestones, project the working set you need now — to stop long-chain goal drift.
• Scratchpad — Thought/Action/Observation appended in a chain; later steps read it and reason along what's done.
• Memory Envelope — Each step seals an envelope for the model: anchor + projected collection + intent + recalled lessons + the mechanical state it needs.
• Layered Memory L1/L2/L3 — L3 stores semantic lesson summaries plus ids back to L2 facts; recall only at major boundaries, like OS memory paging.
• Orchestrator & Facade — The orchestrator is the home of all capabilities and the control-flow trunk; the facade owns SSE presentation, decoupled from control.
• Intent as Compilation — Compile natural-language intent into discrete control signals with an unknown fallback; the intent gateway routes downstream by signal.
• Task DAG & State Machine — Forced out by ReAct's step-skipping — take execution order out of the model's judgment and pin it into a task graph + state machine.
• Observability · Glass Dome — Wrap the agent's mental and physical activity into semantic events, fully visible to the developer along a timeline.
• HITL Block-Resume — Block before critical actions for human review; it falls out naturally from the task state machine, with declarative review points.

Back to the pattern matrix.