Production patterns for agent orchestrators, harnesses, evals, MCP/A2A interoperability, memory, provider routing, and LLM usage metering.
Skill Claude CodeCodex
Use when measuring whether an agent actually works — building an eval suite, judging a trajectory rather than a final answer, turning production traces into regression fixtures, calibrating an LLM judge against human labels, or gating a release on offline evals. Covers the three observability primitives (run, trace…
Skill Claude CodeCodex
Use when the question is what the agent is TOLD rather than how its loop is wired — writing or fixing a system prompt, shaping tools so the model picks the right one, deciding whether a job wants a workflow or an agent, or choosing between ReAct, reflection and voting. Also auditing an agent system somebody else…
Skill Claude CodeCodex
Use when an agent must talk to something outside its own process — building or consuming an MCP server, exposing or calling another agent over A2A, publishing to the MCP Registry, or putting a gateway in front of agent traffic. Carries the MCP 2026-07-28 wire surface and what it deprecated (server/discover, stateless…
Skill Claude CodeCodex
Use when building an agent system — an orchestrator, an LLM-powered tool, a chatbot with tool use, an AI pipeline — or metering and billing the LLM access it burns. Covers tool-calling loops, pipelines with human checkpoints, provider routing with fallback/retry, memory architecture, retrieval and decay, context…