TECH Signal 489
Building an Advanced Agentic Harness
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The post upgrades a simple LLM loop into a production-grade agent harness by composing typed tools, a dependency graph, tiered memory, verification layers, budgeting, and a thin orchestrator.
Engineers building LLM-driven agents need more than a single call; they must handle invalid tool arguments, uncontrolled context growth, silent failures, and cost overruns. The described primitives give a concrete, testable way to add validation, parallelism, memory management, correctness checks, and budget limits without locking into a specific vendor. By keeping the orchestrator thin and the LLM interface pluggable, the system stays debuggable, reproducible, and portable.
Written by elseif from the cluster below · every claim links back to a sourceThe three things worth knowing
Typed tools use schema validation to stop the model from producing malformed arguments.
A plan DAG and multi-tier memory with a retrieval budget enable parallel execution while keeping the context window in check.
A verification hierarchy, role separation (Planner, Worker, Critic), and budgeting enforce correctness and cost control, all wrapped in a minimal orchestrator.
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