Kayode

wtf is an agent harness. An agent is a model plus a harness. Model reads the context and picks the next action. The harness is all the code that turns that choice into work. Claude Code, Codex, Antigravity, OpenClaw and Hermes Agent are all harnesses. 8 common parts every agent harness shares: 1. The loop • Sends the context to the model and runs whatever tools it asks for • Feeds the results back in for the next step • Decides when the task is finished 2. Tools and sandbox • Give the model a terminal, files, a browser and your connected apps • Run every task inside its own isolated computer • Keep the damage from a bad command inside the sandbox 3. Subagents • Take side tasks off the main agent and run them in parallel • Start each one with a fresh context window • Send back only a short summary, so the main context stays clean 4. Context management • Decides what the model sees on every turn • Loads skills and files only when the task needs them • Summarizes old history before the context window fills up 5. Memory • Stores progress notes, git history and skills on disk • Lets a new session read what the last one did • Picks the work up where it stopped 6. Guardrails • Hold risky actions like emails, payments and deletes for your approval • Keep real credentials outside the sandbox • Give a prompt injection no credentials to steal 7. Verification • Stops the agent from handing you a summary that only sounds finished • Runs tests, browser checks or a separate grader first • Lets the agent call the task done only after those checks pass 8. Observability • Traces every model call and tool call • Spots the agent repeating the same failed edit • Pushes it to try a different approach follow @Saboo_Shubham_ for more on Agent Harness.