# Maintain Project Context > Clean, compact, and reconcile durable project context without changing established meaning. Always use this skill whenever a request cleans, audits, or checks consistency across two or more durable context sources, even when they are called product docs, glossary, decisions, specs, or agent instructions instead of PRODUCT.md, GLOSSARY.md, docs/decisions, docs/specs, AGENTS.md, or CLAUDE.md. Also use for confirmed shipped-spec retirement. Do not use to define new product intent, record one newly settled term or decision, look up context, shape a feature, or implement work. - Skill: `toy-crane/maintain-project-context` (Agent Skill, multi-file: 9 files) - Install (CLI): `npx skillmds@latest add toy-crane/maintain-project-context` - Raw SKILL.md: https://api.skillmd.com/api/skills/toy-crane/maintain-project-context/raw - Safety review: pending - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: AI & ML - Author: toy-crane (https://skillmd.com/u/toy-crane) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/toy-crane/maintain-project-context --- # Maintain Project Context Run a deliberate hygiene pass across the durable context that future work will reuse. Make the current meaning easier to retrieve without becoming the decision-maker for any artifact. ## Preserve authority - Apply a meaning only when the user confirmed it, explicitly delegated that class of decision, or an authoritative project source already states it. - Use shipped code to spot stale documentation, not to prove intent. Do not change product code during this pass. - Leave sources unchanged when their intended meaning conflicts or shipment is unclear. Ask the exact question required to continue; never choose by file date, implementation prevalence, labels such as `accepted`, or silence. - Preserve a current fact or decision only in the artifact that owns it. Do not build a parallel summary or copy the same authority across files. ## Inspect the durable surfaces Inspect only the surfaces that exist or are required by the cleanup: - root `PRODUCT.md` for the app-level product premise; - root `GLOSSARY.md` for current project terms; - `docs/decisions/README.md` and the relevant subject contracts; - `docs/specs//` folders whose work may have shipped; - always-loaded repository guidance such as `AGENTS.md` and `CLAUDE.md`. Do nothing merely because an optional file is absent. This is a periodic cross-artifact pass, not the incremental capture of a single newly settled term, decision, or follow-up. ## Maintain product context When `PRODUCT.md` exists, compare its claims with explicit current product decisions and other authoritative context. Remove duplicated or obsolete wording and apply already-settled product meaning while preserving still-current content. Keep `PRODUCT.md` product-only: app definition, users and situations, problem and alternatives, promised change, core loop, app-wide capabilities and boundaries, experience principles, success signals, assumptions, and unknowns. Do not move stack, architecture, repository mechanics, screen requirements, work-unit scope, or acceptance criteria into it. When a proposed edit would choose a new audience, problem, promise, core loop, product boundary, or other product intent, leave the file unchanged and ask the user to settle that meaning. Use `define-product` when it is available and the user wants to reopen the product premise; otherwise ask the same exact product question directly. ## Maintain decision contracts List `docs/decisions/` and read its index when it exists. Check for files missing from the index, then compare relevant subjects with current context and remaining specs. Keep one editable decision file per subject. Use Git for history instead of keeping old decision files in the active folder. When several files clearly agree on one decision, merge them under the clearest stable subject name. Update every inbound link before deleting redundant files. Every decision contract created or edited in this pass needs a subject title and these required sections: - `Decisions`: every current rule; - `Why`: the minimum reason needed to apply the rule without repeating the same debate. Add these sections only when they carry current value: - `Boundaries`: limits or exceptions; - `Reconsider when`: a specific condition that should reopen the decision; - `Still-rejected alternatives`: a future agent might retry a rejected path; - `Evidence worth preserving`: a measurement or experiment would be costly to reproduce. Remove status fields, supersession chains, adoption or update dates, pull-request order, and old implementation notes. Keep a date when it sets a current rule or tells future work when to reconsider. Before removing other content, ask whether its absence could make a capable future agent repeat the same proposal, investigation, experiment, or failed approach under the same conditions. If so, keep the shortest explanation that prevents repetition. Remove duplicates and alternatives that cannot reasonably recur. ## Maintain related files - In `docs/decisions/README.md`, keep exactly one entry per decision file: `- [subject](subject.md) — Read when ...`. Make every link work. The routing phrase says when to open the file, not what it decided. - In `GLOSSARY.md`, keep only terms the project currently uses and rewrite a definition only when the project's language has already changed. - For each `docs/specs//` confirmed as shipped, first preserve every qualifying reusable decision in its owning contract, then delete the folder. If shipment is unclear, leave it and ask. In active specs, update only links and terms already confirmed elsewhere. - In always-loaded instructions, keep repository working rules and a route to the decision index. Remove copied decision or product content without changing unrelated instructions. Create, rename, or rebuild decision contracts and their index when the cleanup requires it. Do not merge unrelated subjects or remove necessary instructions to hit a size target. Report an index or always-loaded file that remains hard to navigate and explain why. ## Finish Finish when every safely resolvable subject has one owner and one current representation, confirmed shipped specs are retired, optional current surfaces contain no known stale duplication, and ambiguous meaning remains preserved. Report what changed, what was deleted, what was intentionally left unchanged, and the exact question needed for every unresolved conflict or unclear shipment.