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Blog — AI Prompts & Prompt Engineering — Page 3 | PromptABCD

AI Prompts & Prompt Engineering

Practical guides, templates, and tips for Claude, ChatGPT, Gemini, and beyond.

All Agent Loop Engineering AI Agents AI Harness AI Writing Autonomous AI Agents ChatGPT Prompts Claude Prompts CLI AI Agents Cloud AI Agents Coding with AI Gemini Prompts Marketing & Copywriting Multi-Agent Systems Productivity Prompt Engineering

AI Harness

Testing Your Harness Against Prompt Injection

Injection resistance is something you measure, not assert. Harness prompt injection testing attacks your own agent with a corpus of payloads in CI before someone else does.

September 9, 2026·8 min read

AI Harness

Multi-Tenant Agent Harness Design

One tenant's batch job starved everyone; a keying bug leaked another's data. A multi tenant agent harness makes isolation structural: namespaced state, scoped creds, fair scheduling.

September 9, 2026·8 min read

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AI Harness

Resuming an Interrupted Agent Run

Retrying a failed run repeats every side effect it already committed. A resume agent run harness continues from the last step instead — with journaling and idempotency keys.

September 9, 2026·8 min read

AI Harness

Persisting Agent State in the Harness

What must a run save to survive a crash, and what should never touch disk? Agent state persistence draws that line: consistent, secret-free, versioned checkpoints.

September 9, 2026·9 min read

AI Harness

Building a Harness for Long-Running Agents

A four-hour run can't live in a thirty-second request. A long running agent harness separates the durable run from the disposable worker so it survives crashes and deploys.

September 9, 2026·8 min read

AI Harness

How to Stream Harness Output to a UI

Users bail on silent spinners fast. An agent harness streaming ui streams structured events — tool calls, results, tokens — so a long run shows its work as it happens.

September 9, 2026·8 min read

AI Harness

Validating Tool Arguments Before Execution

The model sent 2026-02-30 and the schema passed it. Agent tool argument validation is the layer that checks arguments against reality, not just against a shape.

September 8, 2026·9 min read

AI Harness

Structured Tool Schemas in the Harness

Your agent tool schema is a prompt, not just a validator. Written well, its descriptions and enums control model behavior more reliably than half your system prompt.

September 8, 2026·8 min read

AI Harness

Building an Audit Log Into Your Harness

Can you reconstruct exactly what your agent did, tamper-proof? An agent harness audit log turns 'we think it did X' into an unforgeable, queryable record.

September 8, 2026·8 min read

AI Harness

How to Handle Secrets and API Keys in a Harness

A Stripe key sitting in every log line is what bad agent harness secrets management looks like. This teardown rebuilds it so the model never sees a credential.

September 8, 2026·8 min read

AI Harness

Approval Gates: Requiring Human Sign-Off in the Harness

A blocking approval step froze workers for hours; a blanket one became a rubber stamp. Here's how one team built an agent approval gate that's async, durable, and specific.

September 8, 2026·8 min read

AI Harness

Permission Systems for Agent Tools

A 'confirm before deleting' prompt let an agent wipe 200,000 rows. Build an agent tool permissions layer that enforces rules in code, not politeness.

September 8, 2026·9 min read