Adds AsOf to the Code Quality & Testing section.

What it is

A temporal-awareness skill for tool-using LLMs. It addresses a specific failure mode: the agent treats all in-context data as if captured "now," regardless of how stale it actually is. AsOf surfaces three categories of staleness:

1. In-context file staleness — files Read earlier whose mtime has moved since (peer edits, user edits in another tool)
2. Dated content in user paste — stock quotes, earnings, log entries with embedded timestamps
3. Pseudo-stable factual claims — "typical hotel cost," "current Python version," etc. — compared against the model's training cutoff

Why it fits Code Quality & Testing

The category is about preventing wrong outputs. AsOf prevents a specific class of wrong output: reasoning grounded in data that's silently obsolete. A/B tests on Opus 4.7 and Sonnet 4.6 show categorical behavior change when the verdict block is present.

Install

pip install asoftime && asof install (patches ~/.claude/settings.json idempotently). MIT.