Agent skill
check-context
Accurately check current context window and token usage. Use when the user asks about context usage, token consumption, or when monitoring context levels.
Install this agent skill to your Project
npx add-skill https://github.com/zylos-ai/zylos-core/tree/main/skills/check-context
SKILL.md
Check Context Skill
Check current context/token usage. The data source depends on the active runtime.
When to Use
- When the user asks about context usage
- When the user wants to know token consumption
How to Use
First, check the active runtime:
node -e "try { const c=JSON.parse(require('fs').readFileSync(require('path').join(process.env.HOME,'zylos/.zylos/config.json'),'utf8')); console.log(c.runtime||'claude'); } catch { console.log('claude'); }"
If Claude runtime
Read the statusLine data file (updated after every turn):
cat ~/zylos/activity-monitor/statusline.json
Report from the JSON:
- Context usage:
context_window.used_percentage% used,context_window.remaining_percentage% remaining - Tokens:
context_window.total_input_tokensinput,context_window.total_output_tokensoutput (window size:context_window.context_window_size) - Session cost:
cost.total_cost_usd - Model:
model.display_name
If Codex runtime
Read token usage from the most recently modified Codex JSONL session file:
node -e "
const fs=require('fs'),path=require('path');
const base=path.join(process.env.HOME,'.codex/sessions');
let best=null,bestMtime=0;
function walk(d,depth){if(depth>3)return;try{fs.readdirSync(d).forEach(f=>{const p=path.join(d,f);try{const s=fs.statSync(p);if(s.isDirectory())walk(p,depth+1);else if(f.startsWith('rollout-')&&f.endsWith('.jsonl')&&s.mtimeMs>bestMtime){bestMtime=s.mtimeMs;best=p;}}catch{}});}catch{}}
walk(base,0);
if(!best){console.log('No session found');process.exit(0);}
const lines=fs.readFileSync(best,'utf8').split('\n').filter(Boolean);
for(let i=lines.length-1;i>=0;i--){try{const j=JSON.parse(lines[i]);if(j.type==='event_msg'&&j.payload?.type==='token_count'&&j.payload.info.last_token_usage){const u=j.payload.info.last_token_usage.input_tokens;const c=j.payload.info.model_context_window||128000;console.log('used:'+u+' ceiling:'+c+' pct:'+Math.round(u/c*100)+'%');process.exit(0);}}catch{}}
console.log('No token_count event found');
"
Report:
- Context usage: pct% used (used / ceiling tokens)
- Report the pct value clearly so the user knows if rotation is needed (threshold: 75%)
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