session-logs

name: session-logs description: Search and analyze your own Lemon session logs (older/parent conversations) using jq. metadata: { "lemon": { "emoji": "📜", "requires": { "bins": ["jq", "rg"] } } }

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

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

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

jq -r 'select(.type=="message" and .message.role == "user") | .message.content[]? | select(.type == "text") | .text' <session>.jsonl

Search for keyword in assistant responses

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

jq -s '[.[] | select(.type=="message") | .message.usage.cost.total // 0] | add' <session>.jsonl

Daily cost summary

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=$(jq -s '[.[] | select(.type=="message") | .message.usage.cost.total // 0] | add' "$f")
  echo "$day $cost"
done | awk '{a[$1]+=$2} END {for(d in a) print d, "$"a[d]}' | sort -r

Count messages and tokens in a session

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

jq -r '.message.content[]? | select(.type == "toolCall") | .name' <session>.jsonl | sort | uniq -c | sort -rn

Search across ALL sessions for a phrase

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)

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