Check a batch from your coding agent.

Add the local plugin.

Download and extract the bundle, then run these commands from its directory. Keep that directory available for updates. The bundle contains the skill, pinned example, local helpers and verification records.

unzip pycharter-0.1.0.zip -d optophi-plugin
cd optophi-plugin/optophi-pycharter-0.1.0
codex plugin marketplace add .
codex plugin add pycharter@optophi-local

Installation adds the plugin to Codex. Python dependencies are a separate setup step; the skill uses an isolated environment or a compatible existing interpreter.

Start with a fresh local result.

Start a new Codex session in the project where you want the files, then ask:

Use $pycharter-validate to create the offline price-batch example here and reproduce its actual validation evidence. Preserve all source files and report where the fresh evidence is saved.

The agent creates the example, runs the published PyCharter validator, and saves fresh evidence. If a prerequisite is missing, it reports the blocked check. The browser walkthrough remains a recorded example.

Keep the rule, input and failure together.

The example contains a contract, valid and rejected batches, a known synthetic correction, and actual validation results. One of two rejected-batch records fails because its close is −8.25.

• Exact inputsEvidence names the input and contract hashes, runtime version, check time, counts and diagnostics.
• A legitimate correctionThe synthetic reference supplies 8.25. Your own rejected value needs a trusted source; an unknown value stays unresolved.
• A fresh checkSave new evidence for each check and retain earlier failures. A remembered conversation is insufficient evidence.

Use your own batch, or return tomorrow.

For local self-contained JSON contracts and JSON arrays of records, a natural request can select the installed skill:

Validate batch.json against contract.json before I load this batch. Save actual diagnostics and file hashes to a new evidence file. Preserve the input files; there is no trusted source for correcting rejected values.

If the agent does not select it, explicitly name $pycharter-validate. To resume saved work:

Inspect the saved input and contract, rerun the rejection check, and save fresh evidence to a new file. Preserve all previous files and report whether the result is a newly executed check.

Update or remove it on your terms.

Update the extracted source, reinstall with codex plugin add pycharter@optophi-local, and start a new session. To disable without removing, set enabled = false under [plugins."pycharter@optophi-local"] in your applicable Codex configuration.

codex plugin remove pycharter@optophi-local
codex plugin marketplace remove optophi-local

Removing the plugin leaves your project files and evidence available for direct Python use.