codex agents md: start with the exact job
AGENTS.md gives Codex repository instructions that can be resolved by location and scope. The file should state durable commands, ownership boundaries, coding constraints, and verification expectations. It should not become a generic engineering handbook or contain secrets and transient task detail.
This page owns the intent “write repository instructions that Codex resolves predictably.” It does not replace the broader Codex CLI topic or adjacent implementation decisions. Keeping that boundary visible prevents two pages from answering the same search job with slightly different wording.
How the codex agents md control surface works
Instruction precedence depends on the current Codex discovery contract and the location of applicable files. Root guidance can cover the monorepo while nested files refine rules for owned subtrees. Contradictory rules are costly because the agent must infer which instruction governs a change.
For codex agents md, the closest architectural context is Codex CLI. Read that dependency when the current decision needs a parent workflow or prerequisite. This anchor follows the reader's next question instead of repeating the page keyword mechanically.
In the codex agents md operating model, capability, permission, and evidence remain separate. Capability describes what this interface can attempt; permission limits which attempt may execute; evidence shows whether the resulting artifact satisfies the declared write repository instructions that Codex resolves predictably requirement. Combining them would make this page's comparisons and incident review unreliable.
codex agents md: mechanism and verification path
Implementation guide: a reproducible working sequence
Use this codex agents md sequence as a reviewable method, not as a claim that one prompt guarantees write repository instructions that Codex resolves predictably. Pin the relevant official documentation, keep sensitive values out of the record, and connect every permission expansion to a named requirement in this workflow.
- Inventory repository-wide and subtree-specific rules before adding files.
- Place guidance at the narrowest scope that consistently owns the affected code.
- Use concrete commands and constraints instead of vague quality language.
- Test instruction resolution on files from root and nested packages after every hierarchy change.
After the codex agents md sequence, the next implementation detail is Codex Instruction Hierarchy Across a Monorepo. That destination owns its narrower search job, while this article stays responsible for write repository instructions that Codex resolves predictably.
For codex agents md, write the expected signal before each action. A successful command can still produce the wrong artifact, and a fluent agent summary can omit scope drift. The check must observe what this search job actually changes: a diff, test, typed contract, rendered interface, structured trace, or explicit denied path.
Keep evidence beside the codex agents md result
Build an instruction map with file path, governed subtree, rule owner, last review date, and the check each material rule changes. Test representative files from different subtrees to confirm that the intended chain is visible.
| Question | Record |
|---|---|
| What was attempted? | Bounded task and starting state |
| What could act? | Tools, permissions, sandbox, and credentials by name only |
| What changed? | Artifacts, paths, or external side effects |
| What proves the result? | Independent check, reviewer decision, and remaining uncertainty |
The codex agents md ledger needs a version and date because the documented contract can evolve. Its attached search metric describes demand for this intent, not product quality. This article makes no benchmark, success-rate, or cost claim; any later test must publish a protocol and the evidence required to inspect it.
codex agents md: evidence and control decision
Test the failure paths before expanding access
For codex agents md, the architecture flags these recurring risks: CLI, app, and cloud behavior are conflated; Sandbox and approval settings are omitted; Model or feature churn makes the steps stale. Convert each one into a denied or recovery case tied to write repository instructions that Codex resolves predictably. The resulting trace should identify the attempted action, the layer that stopped it, the evidence retained, and the safe next step.
- Use a disposable fixture for commands that may mutate files or external state.
- Remove secrets and confidential source from logs before sharing evidence.
- Confirm that malformed input and missing dependencies fail visibly.
- Stop when the next action needs new authority or an unverified assumption.
When the codex agents md reader reaches the related boundary, continue with Codex Subagents. That destination owns its decision while this page remains canonical for write repository instructions that Codex resolves predictably.
A decision rule for codex agents md
Add an instruction when it applies across repeated tasks in that scope and affects an observable action. Keep one-off requirements in the current request, reusable specialist method in a skill, and volatile Codex behavior in official documentation.
Before adopting this codex agents md workflow, name its owner, the evidence that justifies its permissions, the review that confirms write repository instructions that Codex resolves predictably, and the event that triggers revalidation. Those four answers turn this specific capability into an operating choice a team can maintain.
Use the codex agents md child guides for execution details and return here when its operating model changes. This split keeps the high-demand overview reachable from the main architecture while each installation, configuration, or comparison question resolves on one canonical URL.