phase-plan

You are the plan phase agent. You run inside claude --bg and own a single responsibility: produce thoughts/shared/plans/<date>-<ticket>.md that meets the schema enforced by [[create-plan]], then emit phase.plan.complete.<ticket> and exit. Built on the [[_phase-agent-template]] contract.

Plans are TDD-structured: Tests First (Red) → Implementation (Green) → Refactor → Success Criteria for every phase, with success criteria split into Automated and Manual Verification.

Prelude

set -uo pipefail

: "${CATALYST_ORCHESTRATOR_DIR:?required (set by phase-agent-dispatch)}"
: "${CATALYST_ORCHESTRATOR_ID:?required}"
: "${CATALYST_PHASE:?required}"
: "${CATALYST_TICKET:?required}"

ORCH_DIR="$CATALYST_ORCHESTRATOR_DIR"
ORCH_ID="$CATALYST_ORCHESTRATOR_ID"
PHASE="$CATALYST_PHASE"
TICKET="$CATALYST_TICKET"
CHANNEL="orch-${ORCH_ID}"

SIGNAL_FILE="${ORCH_DIR}/workers/${TICKET}/phase-${PHASE}.json"
[[ -f "$SIGNAL_FILE" ]] || { echo "phase-${PHASE}: signal file missing" >&2; exit 1; }

PLUGIN_ROOT="${CLAUDE_PLUGIN_ROOT:-$(cd "$(dirname "$0")/../../.." && pwd)}"

# Join comms channel (best-effort).
COMMS="${PLUGIN_ROOT}/scripts/catalyst-comms"
[[ -x "$COMMS" ]] || COMMS="$(command -v catalyst-comms 2>/dev/null || true)"
if [[ -n "$COMMS" ]]; then
  "$COMMS" join "$CHANNEL" --as "$TICKET" \
    --capabilities "phase-${PHASE}: ${TICKET}" \
    --orch "$ORCH_ID" --parent orchestrator --ttl 3600 >/dev/null 2>&1 || true
  "$COMMS" send "$CHANNEL" "phase-plan started" --as "$TICKET" --type info \
    --orch "$ORCH_ID" >/dev/null 2>&1 || true
fi

# Start session.
SESSION_SCRIPT="${PLUGIN_ROOT}/scripts/catalyst-session.sh"
if [[ -x "$SESSION_SCRIPT" ]]; then
  CATALYST_SESSION_ID=$("$SESSION_SCRIPT" start \
    --skill "phase-${PHASE}" \
    --ticket "$TICKET" \
    --workflow "${CATALYST_SESSION_ID:-}")
  export CATALYST_SESSION_ID
fi

TS=$(date -u +%Y-%m-%dT%H:%M:%SZ)
TMP="${SIGNAL_FILE}.tmp.$$"
# CTL-496: persist catalystSessionId so orchestrate-roll-usage --phase can
# attribute cost to the right session_metrics row.
jq --arg ts "$TS" --arg sid "${CATALYST_SESSION_ID:-}" '
  .status = "running"
  | .updatedAt = $ts
  | if $sid != "" then .catalystSessionId = $sid else . end
' "$SIGNAL_FILE" > "$TMP" \
  && mv "$TMP" "$SIGNAL_FILE"

# Prior-phase artifact: the research document. Dispatcher gates this via
# match_thoughts_artifact (lib/phase-artifact-gate.sh, CTL-1081); re-read
# here so we can fail loudly on race.
source "${PLUGIN_ROOT}/scripts/lib/phase-artifact-gate.sh"
RESEARCH_DOC="$(match_thoughts_artifact thoughts/shared/research "$TICKET" | tail -1 || true)"
if [[ -z "$RESEARCH_DOC" || ! -f "$RESEARCH_DOC" ]]; then
  echo "phase-plan: research document missing for $TICKET" >&2
  "${PLUGIN_ROOT}/scripts/phase-agent-emit-complete" \
    --phase "$PHASE" --ticket "$TICKET" --status failed \
    --reason "prior_artifact_missing:research_doc"
  exit 1
fi

/goal

/goal "I have written thoughts/shared/plans/<date>-${ticket-lower}.md containing the
       full plan with: Overview, Phase 1..N sections each with Tests First (Red),
       Implementation (Green), Refactor, and Success Criteria (Automated + Manual).
       I have printed the path on stdout."

Work block

Generate the plan by invoking the canonical skill rather than reimplementing it. The body of [[create-plan]] is the single source of truth.

Phase agents run inside claude --bg — there is no interactive user. Pass the research document as the input and operate non-interactively:

1. Read $RESEARCH_DOC to understand the problem. While reading, skim any ## Relevant Past Learnings section the research phase surfaced, and any directly-matching entries under thoughts/shared/learnings/, and let those prior problem→solution notes inform the plan (the heavy grep lens lives in phase-research — don't re-run it here).
2. Assert the thoughts/ root belongs to this project before writing (CTL-1081):

   bash "${PLUGIN_ROOT}/scripts/lib/assert-thoughts-project.sh" || {
     "${PLUGIN_ROOT}/scripts/phase-agent-emit-complete" \
       --phase "$PHASE" --ticket "$TICKET" --status failed \
       --reason "wrong_project_thoughts_root"
     exit 1
   }
   

3. Invoke /catalyst-dev:create-plan against the research document. When that skill asks for clarifications, answer from the research document; if the research document is silent on a point, default to the most conservative reasonable choice and record the assumption in the plan's "Open questions" section.
4. Confirm the artifact exists using the shared matcher (CTL-1081):

   # source already called above in the prelude (idempotent guard in the lib).
   source "${PLUGIN_ROOT}/scripts/lib/phase-artifact-gate.sh"
   PLAN_DOC="$(match_thoughts_artifact thoughts/shared/plans "$TICKET" | tail -1 || true)"
   [[ -n "$PLAN_DOC" && -f "$PLAN_DOC" ]] || {
     "${PLUGIN_ROOT}/scripts/phase-agent-emit-complete" \
       --phase "$PHASE" --ticket "$TICKET" --status failed \
       --reason "plan_doc_not_written"
     exit 1
   }
   

If [[create-plan]] runs into a question it cannot resolve from the research document, post a question comms message to the orchestrator with --re <msg_id> correlation; do not block waiting for a reply — record the assumption and proceed.

Inbox check (CTL-749)

After /catalyst-dev:create-plan Task returns, check for mid-flight context updates from the human:

1. If ${ORCH_DIR}/workers/${TICKET}/inbox.jsonl exists and is non-empty, read it fully.
2. Parse each JSONL line — entries have kind: "comment" or kind: "description_changed".
3. For each entry, decide:
   • Absorb and continue: the update is additive context (clarification, extra constraints, "also handle X") — fold it into your working context and continue. Post a brief reply comment acknowledging the update (one sentence).
   • Pause and replan: the update fundamentally changes scope or invalidates the current approach — emit failed with reason: "mid_flight_replan_needed" via ${PLUGIN_ROOT}/scripts/phase-agent-emit-complete and post the reason to Linear as a comment before exiting.
4. After reading, archive processed entries:

   [[ -f "${ORCH_DIR}/workers/${TICKET}/inbox.jsonl" ]] && \
     mv "${ORCH_DIR}/workers/${TICKET}/inbox.jsonl" \
        "${ORCH_DIR}/workers/${TICKET}/inbox.processed-$(date +%s).jsonl" || true
   

5. If no inbox file or it is empty, continue normally.

End block

TS=$(date -u +%Y-%m-%dT%H:%M:%SZ)
TMP="${SIGNAL_FILE}.tmp.$$"
jq --arg ts "$TS" --arg doc "$PLAN_DOC" \
  '.updatedAt = $ts | .artifact = $doc' \
  "$SIGNAL_FILE" > "$TMP" && mv "$TMP" "$SIGNAL_FILE"

Mirror the phase output to Linear as a single comment (CTL-632). Fail-open and idempotent via the per-phase marker file. Uniquely-named fence so the e2e test can extract just this block.

LINEAR_MIRROR_MARKER="${ORCH_DIR}/workers/${TICKET}/.linear-mirror-${PHASE}"
if [[ ! -e "${LINEAR_MIRROR_MARKER}" ]]; then
  PLAN_TITLE="$(awk '/^# /{print; exit}' "${PLAN_DOC}" | sed 's/^# //')"
  PLAN_PHASES_COUNT="$(grep -c '^## Phase ' "${PLAN_DOC}" || true)"
  : "${PLAN_PHASES_COUNT:=0}"
  MIRROR_BODY="$(cat <<EOF
**Phase Plan**

- **Document**: \`${PLAN_DOC}\`
- **Title**: ${PLAN_TITLE:-_untitled_}
- **Phases**: ${PLAN_PHASES_COUNT}
- **Research backlink**: \`${RESEARCH_DOC}\`

_Posted automatically by phase-plan (CTL-632)._
EOF
)"
  MIRROR_FOOTER=""
  if [[ -n "${PLUGIN_ROOT:-}" && -x "${PLUGIN_ROOT}/scripts/lib/phase-mirror-footer.sh" ]]; then
    MIRROR_FOOTER="$("${PLUGIN_ROOT}/scripts/lib/phase-mirror-footer.sh" --orch-dir "${ORCH_DIR}" --ticket "${TICKET}" --phase "