ck
Skill8 starsChanged 3 months agoMITView on GitHub
Persistent per-project memory for Claude Code. Auto-loads project context on session start, tracks sessions with git activity, and writes to native memory. Commands run deterministic Node.js scripts — behavior is consistent across model versions. Use when a project needs context to survive across Claude Code sessions instead of being re-explained each time.
We split this skill into the rules it gives an agent
7 rules. About 0 are common, 1 is distinctive, and 6 are very specific to this project.
≈0
Common · estimate
Many files like this have a rule of this kind.
≈1
Distinctive · estimate
This author's own choices. Worth a look.
6
Very specific
Tied to their project's names, files or tools. Probably skip.
- Common
- Distinctive
- Very specific
- Very specific: line 47
Wait for user approval. Apply any edits.
- Very specific: line 65
Wait for confirmation. Then pipe to save.mjs:
- Very specific: line 79
If user reports changes → run /ck:save immediately.
- Very specific: line 144
Always expand ~ as $HOME in Bash calls.
- Distinctive: line 146
If a script exits with code 1, display its stdout as an error message.
- Very specific: line 147
Never edit context.json or CONTEXT.md directly — always use the scripts.
- Very specific: line 148
If projects.json is malformed, tell the user and offer to reset it to {}.
≈ “Common” is an estimate: at least 1 in 5 of the 308,232 skill files we read have a rule of the same kind, not the same words. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.
Files
ck — Context Keeper
You are the Context Keeper assistant. When the user invokes any /ck:* command,
run the corresponding Node.js script and present its stdout to the user verbatim.
Scripts live at: ~/.claude/skills/ck/commands/ (expand ~ with $HOME).
Data Layout
~/.claude/ck/
├── projects.json ← path → {name, contextDir, lastUpdated}
└── contexts/<name>/
├── context.json ← SOURCE OF TRUTH (structured JSON, v2)
└── CONTEXT.md ← generated view — do not hand-editCommands
/ck:init — Register a Project
node "$HOME/.claude/skills/ck/commands/init.mjs"The script outputs JSON with auto-detected info. Present it as a confirmation draft:
Here's what I found — confirm or edit anything:
Project: <name>
Description: <description>
Stack: <stack>
Goal: <goal>
Do-nots: <constraints or "None">
Repo: <repo or "none">Wait for user approval. Apply any edits. Then pipe confirmed JSON to save.mjs --init:
echo '<confirmed-json>' | node "$HOME/.claude/skills/ck/commands/save.mjs" --initConfirmed JSON schema: {"name":"...","path":"...","description":"...","stack":["..."],"goal":"...","constraints":["..."],"repo":"..." }
/ck:save — Save Session State
This is the only command requiring LLM analysis. Analyze the current conversation:
summary: one sentence, max 10 words, what was accomplishedleftOff: what was actively being worked on (specific file/feature/bug)nextSteps: ordered array of concrete next stepsdecisions: array of{what, why}for decisions made this sessionblockers: array of current blockers (empty array if none)goal: updated goal string only if it changed this session, else omit
Show a draft summary to the user: "Session: '<summary>' — save this? (yes / edit)"
Wait for confirmation. Then pipe to save.mjs:
echo '<json>' | node "$HOME/.claude/skills/ck/commands/save.mjs"JSON schema (exact): {"summary":"...","leftOff":"...","nextSteps":["..."],"decisions":[{"what":"...","why":"..."}],"blockers":["..."]}
Display the script's stdout confirmation verbatim.
/ck:resume [name|number] — Full Briefing
node "$HOME/.claude/skills/ck/commands/resume.mjs" [arg]Display output verbatim. Then ask: "Continue from here? Or has anything changed?"
If user reports changes → run /ck:save immediately.
/ck:info [name|number] — Quick Snapshot
node "$HOME/.claude/skills/ck/commands/info.mjs" [arg]Display output verbatim. No follow-up question.
/ck:list — Portfolio View
node "$HOME/.claude/skills/ck/commands/list.mjs"Display output verbatim. If user replies with a number or name → run /ck:resume.
/ck:forget [name|number] — Remove a Project
First resolve the project name (run /ck:list if needed).
Ask: "This will permanently delete context for '<name>'. Are you sure? (yes/no)"
If yes:
node "$HOME/.claude/skills/ck/commands/forget.mjs" [name]Display confirmation verbatim.
/ck:migrate — Convert v1 Data to v2
node "$HOME/.claude/skills/ck/commands/migrate.mjs"For a dry run first:
node "$HOME/.claude/skills/ck/commands/migrate.mjs" --dry-runDisplay output verbatim. Migrates all v1 CONTEXT.md + meta.json files to v2 context.json.
Originals are backed up as meta.json.v1-backup — nothing is deleted.
SessionStart Hook
The hook at ~/.claude/skills/ck/hooks/session-start.mjs must be registered in
~/.claude/settings.json to auto-load project context on session start:
{
"hooks": {
"SessionStart": [
{ "hooks": [{ "type": "command", "command": "node \"~/.claude/skills/ck/hooks/session-start.mjs\"" }] }
]
}
}The hook injects ~100 tokens per session (compact 5-line summary). It also detects unsaved sessions, git activity since last save, and goal mismatches vs CLAUDE.md.
Rules
- Always expand
~as$HOMEin Bash calls. - Commands are case-insensitive:
/CK:SAVE,/ck:save,/Ck:Saveall work. - If a script exits with code 1, display its stdout as an error message.
- Never edit
context.jsonorCONTEXT.mddirectly — always use the scripts. - If
projects.jsonis malformed, tell the user and offer to reset it to{}.
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Now do this for your own.
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