Documentation quality
Documentation drift is the gap that opens when code changes and the docs that describe it do not. The README still says one install path, the architecture page still shows a service you deleted, and nobody trusts the wiki enough to update it. Here is how drift happens, how to spot it, and what actually keeps docs true.
Last reviewed: July 2026
Documentation drift is the state where written documentation no longer accurately describes the system it claims to document. The code is the living system; the docs are a snapshot that aged poorly.
Drift is not the same as missing docs. Missing docs were never written. Drifted docs were written once - often carefully - and then the product moved on without them.
Drift is structural, not a moral failing of the team. Code and docs usually live in different places, ship on different cadences, and get different rewards. Merging a feature is visible. Updating the wiki is optional and rarely reviewed.
Common causes stack on top of each other:
You do not need a full audit to know drift is present. These signals show up early:
Most teams start with process: doc checklists on PRs, quarterly doc days, or a wiki owner. Those help for a while, then lose to delivery pressure.
Stronger approaches couple docs to the source of truth:
Useful detection is specific. "Docs might be outdated" is noise. Better signals look like:
How-to
Start with README, architecture notes, AGENTS.md, and onboarding steps that must stay true. Wiki-only pages for those topics are the first to rot.
Ask whether this change affects public behavior, setup, or architecture - and link the page that should update. Process alone is incomplete, but it catches conscious omissions.
Use tooling that re-reads the repository when code lands and flags pages that no longer match source - ideally before the wrong instructions train a new hire or an agent.
Prefer small, docs-only pull requests your team can approve in normal review, not silent overwrites and not a quarterly rewrite project.
How Moxie Docs approaches drift
Moxie Docs indexes your GitHub repository, generates source-cited documentation, and re-checks it as code changes. When docs fall behind, it surfaces gaps and opens reviewable docs-only Cleanup PRs - then serves the current index to coding agents over MCP so stale pages do not become stale agent behavior.
FAQ
Quick answers to the questions developers ask about What is documentation drift?.
Documentation drift is when written docs no longer match the system they describe - usually because code changed and the documentation did not. The pages still exist, but they are wrong or incomplete relative to current source.
Code and docs often live in different tools, update on different schedules, and get different incentives. Partial PR updates, wiki-only architecture pages, and faster AI-assisted shipping all widen the gap.
Compare recent code changes and current repository structure to the docs that claim to describe them. Path-level mismatches, outdated conventions, and missing coverage for critical modules are the useful signals - not a vague "maybe stale" label.
Missing docs were never written. Drifted docs were written and then the product changed underneath them. Both hurt trust; drift is more dangerous because teams assume the page is still authoritative.
Yes. Agents ship more code per week, and they also read your existing docs and AGENTS.md. If those files are stale, agents learn the wrong patterns and produce more incorrect code and docs.
Keep reading
Point of view
Why docs drift, and what it takes to keep them true.
Read the guideAgent context
How Cursor, Claude Code, and Codex learn your private codebase.
Read the guideConventions
Three files for AI context - and what each is actually for.
Read the guideGet started
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