AI HarnessTurning a Prototype Harness Into Production CodeYour prototype agent loop worked in the demo and broke in production. Here's how to turn it into a production agent harness with timeouts, retries, and clean shutdown.September 8, 2026·10 min read
AI HarnessManaging the System Prompts Your Harness InjectsHarness system prompt management stops the one-word edit that silently breaks every task. Learn to version prompts, gate changes on evals, and review every diff.September 1, 2026·8 min read
AI HarnessConcurrency in an Agent Harness: A Case StudyAgent harness concurrency breaks on shared mutable state, not on parallelism. A case study on the one-line class-attribute bug that leaked context between runs.September 1, 2026·8 min read
AI HarnessCost Tracking in an AI Agent HarnessAgent harness cost tracking shows why the bill tripled — usually context re-sending, not run count. Learn per-step tracking, ceilings, and cache-friendly prompts.September 1, 2026·8 min read
AI HarnessRate Limiting Inside the Agent HarnessAgent harness rate limiting done reactively makes overload worse. Learn proactive, token-aware limiting that stops the 429 retry storm before it starts.September 1, 2026·9 min read
AI HarnessBuilding a Harness That Swaps Models EasilyA model agnostic agent harness turns a week-long provider rewrite into an afternoon. Learn the adapter pattern and why portable code doesn't mean portable behavior.September 1, 2026·8 min read
AI HarnessMeasuring Pass@k for AI Agents (and Why It Misleads)A pass at k agent eval can hide terrible single-attempt reliability. A case study on shipping a 90% pass@5 agent that failed half its first tries in production.August 31, 2026·8 min read
AI HarnessGolden Datasets for Agent Evaluation, Done RightAn agent golden dataset is only as good as its governance. Learn to build curated, human-reviewed input-output pairs and review every golden change like code.August 31, 2026·8 min read
AI HarnessRecording and Replaying Agent Sessions for DebuggingAn agent session replay harness reproduces a one-time production bug on demand. Learn to record model and tool I/O once, then replay it deterministically.August 31, 2026·8 min read
AI HarnessMocking Tools in Your Agent Test HarnessMock tools agent testing keeps your suite fast, safe, and free of real side effects. Learn to key mocks to arguments, record real responses, and test failures.August 31, 2026·8 min read
AI HarnessHow to Run Repeatable Agent Tests Without the FlakesRepeatable agent testing means pinning the three sources of nondeterminism. A case study on going from 47% flaky CI to reliably green by freezing all three.August 31, 2026·8 min read
AI HarnessThe SWE-bench Harness Explained for Agent BuildersThe swe-bench harness fails logically correct patches when the environment is wrong. Learn how it grades, what FAIL_TO_PASS means, and how to run it yourself.August 28, 2026·8 min read
