/flow-next-deps

name: flow-next-deps
description: "Show spec dependency graph and execution order. Use when asking 'what's blocking what', 'execution order', 'dependency graph', 'what order should specs run', 'critical path', 'which specs can run in parallel'."

Flow-Next Dependency Graph

Visualize spec dependencies, blocking chains, and execution phases.

Preamble

flowctl is bundled with the plugin (not on PATH). Define once; subsequent blocks use `$FLOWCTL`:

FLOWCTL="${DROID_PLUGIN_ROOT:-${CLAUDE_PLUGIN_ROOT}}/scripts/flowctl"
[ -x "$FLOWCTL" ] || FLOWCTL=".flow/bin/flowctl"

Setup

$FLOWCTL detect --json | jq -e '.exists' >/dev/null && echo "OK: .flow/ exists" || echo "ERROR: run $FLOWCTL init"
command -v jq >/dev/null 2>&1 && echo "OK: jq installed" || echo "ERROR: brew install jq"

Step 1: Gather Spec Data

Build a consolidated view of all specs with their dependencies — ONE heavy per-spec loop for the whole skill. Steps 2 and 3 reuse the cached file (bash vars do not survive across tool calls, so the cache is a file at a literal agent-composed path — compose `<suffix>` once, e.g. 4 random chars, and reuse the SAME literal path in every later block):

# ONE gather — Steps 2 and 3 read this file; never re-run the per-spec loop
SPECS_FILE="${TMPDIR:-/tmp}/flow-deps-specs-<suffix>.json"
$FLOWCTL specs --json | jq -r '.specs[].id' | while read id; do
  $FLOWCTL show "$id" --json | jq -c '{
    id: .id,
    title: .title,
    status: .status,
    plan_review: .plan_review_status,
    deps: (.depends_on_epics // [])
  }'
done | jq -s '.' > "$SPECS_FILE"
cat "$SPECS_FILE"

Step 2: Identify Blocking Chains

Determine which specs are ready vs blocked (pure jq, works on any shell):

# Reuse the Step 1 gather — same literal path, NO re-fetch (one heavy loop total)
SPECS_FILE="${TMPDIR:-/tmp}/flow-deps-specs-<suffix>.json"

# Compute blocking status
jq -r '
  # Build status lookup
  (map({(.id): .status}) | add // {}) as $status |

  # Check each non-done spec
  .[] | select(.status != "done") |
  .id as $id | .title as $title |

  # Find deps that are not done
  ([.deps[] | select($status[.] != "done")] | join(", ")) as $blocked_by |

  if ($blocked_by | length) == 0 then
    "READY: \($id) - \($title)"
  else
    "BLOCKED: \($id) - \($title) (by: \($blocked_by))"
  end
' "$SPECS_FILE"

Step 3: Compute Execution Phases

Group specs into parallel execution phases:

# Reuse the Step 1 gather — same literal path, NO re-fetch (one heavy loop total)
SPECS_FILE="${TMPDIR:-/tmp}/flow-deps-specs-<suffix>.json"

# Phase assignment algorithm (run in jq for reliability)
jq '
  # Build status lookup
  (map({(.id): .status}) | add // {}) as $status |

  # Filter to non-done specs
  [.[] | select(.status != "done")] as $open |

  # Assign phases iteratively
  reduce range(10) as $phase (
    {assigned: [], result: [], open: $open};

    .assigned as $assigned |
    .open as $remaining |

    # Find specs not yet assigned whose deps are all done or in earlier phases
    ([.open[] | select(
      ([.id] | inside($assigned) | not) and
      ((.deps // []) | all(. as $d | $status[$d] == "done" or ($assigned | index($d))))
    )] | map(.id)) as $ready |

    if ($ready | length) > 0 then
      .result += [{phase: ($phase + 1), specs: [.open[] | select(.id | IN($ready[]))]}] |
      .assigned += $ready
    else . end
  ) |
  # Emit the phases AND the residue: any open spec never assigned is UNRESOLVABLE — a
  # dependency cycle (A→B→A), a dep on a missing/closed spec, or a chain deeper than 10.
  # Dropping it silently is the one way /deps gives a WRONG answer (the graph it exists to
  # expose hides the deadlock). Surface it, with the offending deps for diagnosis.
  .assigned as $asg |
  { phases: .result,
    deadlocked: [ $open[] | select(.id as $i | ($asg | index($i)) | not)
                  | { id, status,
                      unresolved_deps: [ (.deps // [])[] | select(. as $d | ($asg | index($d)) or ($status[$d] == "done") | not) ] } ] }
' "$SPECS_FILE"

Output Format

Present results as:

## Spec Dependency Graph

### Status Overview

| Spec | Title | Status | Dependencies | Blocked By |
|------|-------|--------|--------------|------------|
| **fn-1-add-auth** | Add Authentication | **READY** | - | - |
| fn-2-add-oauth | Add OAuth Login | blocked | fn-1-add-auth | fn-1-add-auth |
| fn-3-user-profile | User Profile Page | blocked | fn-1-add-auth, fn-2-add-oauth | fn-2-add-oauth |

### Execution Phases

Render from the jq result's `.phases`:

| Phase | Specs | Can Start |
|-------|-------|-----------|
| **1** | fn-1-add-auth | **NOW** |
| 2 | fn-2-add-oauth | After Phase 1 |
| 3 | fn-3-user-profile | After Phase 2 |

### ⚠️ Deadlocked / Unresolvable

**Only render this section when `.deadlocked` is non-empty** — but when it is, it is the
most important part of the report. Each entry is an OPEN spec that could not be placed in
any phase: a dependency **cycle**, a dep on a **missing/closed** spec, or a chain deeper
than 10. These are invisible to `ready`/pilot (they just never become ready) — this is the
one place the graph surfaces them.

| Spec | Status | Unresolved deps | Likely cause |
|------|--------|-----------------|--------------|
| fn-7-x | blocked | fn-9-y | fn-9-y not found / closed, or a cycle fn-7↔fn-9 |

For each, state the likely cause: if two deadlocked specs list each other → **cycle** (fix
with `flowctl spec rm-dep`); if an unresolved dep isn't among the open specs → **missing or
closed dependency**. Never omit a deadlocked spec.

### Critical Path

fn-1-add-auth → fn-2-add-oauth → fn-3-user-profile (3 phases)

**Edit dependencies** with `flowctl spec add-dep <spec> <dep>` / `rm-dep <spec> <dep>` (this skill is read-only inspection; those commands mutate the edges).

Quick One-Liner

For a fast dependency check:

$FLOWCTL specs --json | jq -r '.specs[] | select(.status != "done") | "\(.id