4e7463ef0a
User pushback: live-graph showed only "main" node, no pulses on agents.
Root cause: hook stdin doesn't carry parent_tool_use_id for sub-agent
tool calls — we only get the sub-agent's own session_id, which doesn't
link back to the spawn's tool_use_id.
Sequential heuristic via shared state file:
- agent-event-spawn.sh appends tool_use_id to /tmp/kei-active-children.tsv
- tool-use-event.sh reads the LAST line of that file → uses that
tool_use_id as agent_id for the emitted event
- agent-event-done.sh removes the spawn's line (grep -v + atomic mv)
Verified end-to-end: a code-implementer agent ran 5 Bash calls during
its lifetime — all 5 tool_use events were correctly attributed to the
spawn's tool_use_id. After agent_done, subsequent orchestrator-direct
tool calls correctly fall back to agent_id="main".
Limitation: parallel agents may misattribute. The "most recent live
spawn" heuristic works for single-agent-at-a-time which is the common
case. Parallel spawns share /tmp/kei-active-children.tsv and a sub-
agent's tool calls all attribute to whichever spawn appended last.
Acceptable for v1 demo; proper parent-tool-use-id propagation requires
Claude Code to expose it in sub-agent stdin (upstream change).
The `mv` after `grep -v` runs UNCONDITIONALLY (not gated on grep's
exit code) — grep -v returns 1 when ALL lines match, which would
otherwise leave the stale file in place.
Bypass: `KEI_EVENTS_BYPASS=1` (existing) covers all 3 hooks.
Override path: `KEI_ACTIVE_SPAWNS_FILE=/path/to/file`.
=== STATUS-TRUTH MARKER ===
shipped: functional
stubs: 0
cargo-check: NOT-RUN
behaviour-verified: yes
follow-up-required:
- Parallel-agent attribution would need parent_tool_use_id from
Claude Code sub-agent stdin (not currently exposed).
- Race condition window between spawn append and done remove is
millisecond-scale; observed clean in single-agent demo.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
56 lines
2 KiB
Bash
Executable file
56 lines
2 KiB
Bash
Executable file
#!/bin/sh
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# agent-event-spawn.sh — PreToolUse:Agent hook.
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#
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# Emits `agent_spawn` event to ~/.claude/memory/agent-events.jsonl
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# AND records the tool_use_id in /tmp/kei-active-children.tsv so
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# tool-use-event.sh can attribute incoming sub-agent tool calls
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# to this spawn (sub-agent stdin lacks parent_tool_use_id).
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#
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# Defensive: never blocks, exits 0 on every path.
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# Bypass via `KEI_EVENTS_BYPASS=1`.
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set -u
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[ "${KEI_EVENTS_BYPASS:-0}" = "1" ] && exit 0
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command -v jq >/dev/null 2>&1 || exit 0
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PAYLOAD=$(cat 2>/dev/null || true)
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[ -n "$PAYLOAD" ] || exit 0
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TOOL=$(printf '%s' "$PAYLOAD" | jq -r '.tool_name // empty' 2>/dev/null)
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[ "$TOOL" = "Agent" ] || exit 0
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EVENTS_FILE="$HOME/.claude/memory/agent-events.jsonl"
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mkdir -p "$(dirname "$EVENTS_FILE")" 2>/dev/null || true
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TS=$(date -u +%Y-%m-%dT%H:%M:%S.000Z 2>/dev/null)
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printf '%s' "$PAYLOAD" | jq -c \
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--arg ts "$TS" \
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'{
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ts: $ts,
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event: "agent_spawn",
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id: (.tool_use_id // .toolUseId // "unknown"),
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parent_id: (.session_id // null),
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subagent_type: (.tool_input.subagent_type // null),
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model: (.tool_input.model // null),
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branch: (.tool_input.isolation // null),
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prompt_preview: (
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(.tool_input.prompt // "")
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| gsub("[\"\\n\\r\\t]"; " ")
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| .[0:80]
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)
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}' \
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>> "$EVENTS_FILE" 2>/dev/null || true
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# Active-spawn ledger for tool-use attribution. Sub-agent's hook stdin
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# carries no parent_tool_use_id, so we maintain a small TSV of currently
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# alive spawns; tool-use-event.sh attributes incoming tool_use events to
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# the MOST RECENT live spawn (sequential heuristic — works for the common
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# single-agent-at-a-time case; parallel agents may misattribute).
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TOOL_USE_ID=$(printf '%s' "$PAYLOAD" | jq -r '.tool_use_id // .toolUseId // empty' 2>/dev/null)
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ACTIVE_FILE="${KEI_ACTIVE_SPAWNS_FILE:-/tmp/kei-active-children.tsv}"
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if [ -n "$TOOL_USE_ID" ]; then
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printf '%s\t%s\n' "$(date +%s)" "$TOOL_USE_ID" >> "$ACTIVE_FILE" 2>/dev/null || true
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fi
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exit 0
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