z80dev/lemon/session-logs

Claude Code and agent skill by z80dev/lemon

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Search and analyze your own Lemon session logs (older/parent conversations) using jq.

Install

npx vskill@latest install z80dev/lemon/session-logs

SKILL.md

session-logs

Search your complete conversation history stored in Lemon session JSONL files. Use this when a user references older/parent conversations or asks what was said before.

Trigger

Use this skill when the user asks about prior chats, parent conversations, or historical context that isn't in current memory files.

Location

Session logs live under ~/.lemon/agent/sessions/ and are organized by encoded working directory name:

  • <encoded-cwd>/*.jsonl - Full conversation transcript per session

For example: ~/.lemon/agent/sessions/--home-user-project--/2026...jsonl

The first line in each .jsonl is a session header with metadata.

Structure

Each .jsonl file contains messages with:

  • type: "session" (metadata header) or "message" (conversation entries)
  • timestamp: Epoch timestamp
  • message.role: "user", "assistant", etc.
  • message.content[]: Text, thinking, or tool calls (filter type=="text" for human-readable content)
  • message.usage.cost.total: Cost per response

Common Queries

List all sessions by date and size
bash
for f in ~/.lemon/agent/sessions/*/*.jsonl; do
  ts=$(jq -r 'select(.type=="session") | .timestamp' "$f")
  size=$(wc -c <"$f")
  started="$(date -r "$((ts / 1000))" '+%F %T' 2>/dev/null || printf 'ts=%s' "$ts")"
  echo "$started $size $(basename "$f")"
done | sort -r
Find sessions from a specific day
bash
for f in ~/.lemon/agent/sessions/*/*.jsonl; do
  ts=$(jq -r 'select(.type=="session") | .timestamp' "$f")
  day="$(date -r "$((ts / 1000))" '+%F' 2>/dev/null || true)"
  [[ "$day" == "2026-01-06" ]] && echo "$f"
done
Extract user messages from a session
bash
jq -r 'select(.type=="message" and .message.role == "user") | .message.content[]? | select(.type == "text") | .text' <session>.jsonl
Search for keyword in assistant responses
bash
jq -r 'select(.type=="message" and .message.role == "assistant") | .message.content[]? | select(.type == "text") | .text' <session>.jsonl | rg -i "keyword"
Get total cost for a session
bash
jq -s '[.[] | select(.type=="message" and .message.role=="assistant") | .message.usage.cost.total] | if all(.[]; type=="number") then add // 0 else null end' <session>.jsonl

Missing assistant usage or prices make the total null, not zero. User/tool messages do not represent provider charges.

Daily cost summary
bash
for f in ~/.lemon/agent/sessions/*/*.jsonl; do
  day="$(date -r "$(( $(jq -r 'select(.type=="session") | .timestamp' "$f") / 1000 ))" '+%F' 2>/dev/null || continue)"
  cost=$(jq -s '[.[] | select(.type=="message" and .message.role=="assistant") | .message.usage.cost.total] | if all(.[]; type=="number") then add // 0 else null end' "$f")
  jq -cn --arg day "$day" --argjson cost "$cost" '{day: $day, cost: $cost}'
done | jq -s 'group_by(.day) | map({day: .[0].day, cost: (map(.cost) | if all(.[]; type=="number") then add else null end)}) | sort_by(.day) | reverse'
Count messages and tokens in a session
bash
jq -s '{
  messages: length,
  user: [.[] | select(.type=="message" and .message.role == "user")] | length,
  assistant: [.[] | select(.type=="message" and .message.role == "assistant")] | length,
  first: .[0].timestamp,
  last: .[-1].timestamp
}' <session>.jsonl
Tool usage breakdown
bash
jq -r '.message.content[]? | select(.type == "toolCall") | .name' <session>.jsonl | sort | uniq -c | sort -rn
Search across ALL sessions for a phrase
bash
rg -l "phrase" ~/.lemon/agent/sessions/*/*.jsonl

Tips

  • Sessions are append-only JSONL (one JSON object per line)
  • Large sessions can be several MB - use head/tail for sampling
  • ~/.lemon/agent/sessions is the session root in Lemon
  • No separate sessions.json index file exists for logs

Fast text-only hint (low noise)

bash
jq -r 'select(.type=="message") | .message.content[]? | select(.type=="text") | .text' ~/.lemon/agent/sessions/*/*.jsonl | rg 'keyword'

Security

  • Security scanPassed, 90 of 100Pattern checks on the skill's files.
  • Model reviewPassed

See the full security report

Quality evaluation

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Source

Popularity

Repository stars
133
Repository forks
17
7-day trend score
24

Stars and forks are for the whole GitHub repository, not this skill alone. Refreshed 18 May 2026, 5 months ago.

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