fleetflow Skill | Agent Skills

fleetflow

Facts verified as of 2026-07 (Claude Code Workflow tool, codex-cli 0.125, fleet-worker GLM-5.2/z.ai).

Claude Code's native Workflow tool is a superb orchestration harness with one structural limit: every agent it spawns runs in-process, so they all share one provider (ANTHROPIC_BASE_URL is process-global — only the model alias slot varies per agent). fleetflow ports the Workflow tool's patterns to OS-process workers, where each worker gets its own env block — and therefore its own brain:

| Worker brain | Process | Harness | |---|---|---| | GLM-5.2 / GLM-4.5-Air | claude -p → z.ai endpoint | Claude Code tools, cheap brain (via fleet-worker) | | Codex (GPT-class) | codex exec | OpenAI's own agent harness — a genuinely different toolchain and model | | Sonnet / Haiku | claude -p --model sonnet\|haiku | Claude Code tools, host auth | | Opus | claude -p --model opus | reserve for verify/judge lanes |

The orchestrator is this session — run it on Fable if the account has it, Opus otherwise (ff-doctor --live probes and reports which). Judgment stays in the orchestrator; the scripts own the deterministic mechanics (spawn, journal, gate). That split is the Workflow tool's design, relocated: its JS script is deterministic control flow around model judgment — here the orchestrator session plays the script's role and the journal keeps it resumable.

Decision gate — is fleetflow the right tool?

| Situation | Use | |---|---| | Fan-out where all agents can share the session's provider | native Workflow tool (cheaper, integrated progress UI, schema-forced outputs) | | One-off cheap delegation, single worker | fleet-worker directly | | Worker brains should differ by work class, or you want cross-provider dissent in verification | fleetflow | | Landing the resulting branches | fleet-ops (always) |

Rule of thumb from fleet-worker's locus rule, extended: shell out to process workers only for a large, independent, file-mutating, cost-dominant fan-out you can gate before landing — or when the point is model diversity (a Codex refuter catches what three same-model skeptics miss).

Model routing (work class × brain)

Extends fleet-worker's routing convention with the Codex column and the orchestrator rule:

| Work class | Brain | Why | |---|---|---| | mechanical (batch edits, verifier clones, backfills) | GLM-5.2, Haiku | proven cheap; gate catches misses | | scout (survey, inventory, locate) | Sonnet, GLM-5.2 | breadth over depth | | build (scoped features, refactors) | Sonnet, Codex | Codex = independent harness; good second implementation for judge panels | | verify / judge | Opus + one cross-provider dissenter (Codex or GLM) | never under-power a judge; diversity beats redundancy | | synthesize / land decisions | orchestrator (Fable > Opus) | needs the conversation's context |

Two guardrails carried over verbatim from the native tool's doctrine: reach for the effort lever before the model lever, and a cheap rubber-stamp verifier is worse than none.

The same routing applies INSIDE native Workflow scripts — and it defaults wrong. A 7-day session audit (2026-06-28..07-05) found 75% of 10.1M subagent output tokens ran on Fable/Opus, including 729 StructuredOutput extract/verdict calls, because agent() inherits the session model unless overridden and nobody sets overrides. Doctrine: the stage that decides stays premium (omit the override — inherit); the stages that collect go cheap — { model: 'haiku', effort: 'low' } for extraction/classification/log scans, { model: 'sonnet' } for finder/reviewer sweeps. When unsure, inherit: a wrong cheap answer that survives verification costs more than it saves. Mechanism, routing table, and before/after snippets: references/native-model-routing.md.

The run lifecycle

plan packets → ff-doctor → ff-spawn (×N, background) → ff-collect (gate) → fleet-ops land → clean up

Plan packets that are file-disjoint. No two lanes may touch the same file — this is what makes landing conflict-free and is the #1 planning duty. Pipeline-by-default thinking applies: add a barrier (wait for all lanes) only when a later stage genuinely needs all prior results (dedup, early-exit, cross-lane comparison). See references/native-workflow-insights.md §3.
Preflight: scripts/ff-doctor.sh --live — probes every provider (GLM endpoint, codex login status, Anthropic model availability incl. Fable) and reports the orchestrator tier. Don't spawn a fleet a doctor won't bless.
Spawn: scripts/ff-spawn.sh --run <name> --id <id> --brain <brain> --prompt-file <f> --worktree from the orchestrator's Bash tool with run_in_background: true, one call per lane. ff-spawn creates the worktree lane (fleetflow/<run>/<id> at .fleetflow/<run>/wt-<id>, repo top — never under .claude/), injects the guard preamble (assets/guard-preamble.txt), journals a started record, runs the worker to completion, journals the result.
Collect + gate: scripts/ff-collect.sh <run> <id> — per-brain success semantics (Claude JSON is_error; Codex exit + last-message), then the orchestrator reviews the three-dot diff (git diff main...fleetflow/<run>/<id>) and runs the lane's tests. Always finish with ff-collect.sh --check-main-clean — the escape guard (see Safety).
Land through fleet-ops (sequential, test-gated). Delete lanes and .fleetflow/<run>/ after landing.

Inter-worker communication is hub-and-spoke, by design. Workers never talk to each other — no shared memory, no message bus, no sideband files (lanes are isolated worktrees). The only channel is the native tool's: a worker's FINAL REPLY returns through ff-collect to the orchestrator, which embeds it in a later packet (the prevResult-into-next-prompt handoff; see insights §3/§7). A judge packet is just the collected builder outputs pasted in. If a stage needs all sibling results, that is a barrier — collect everything first, then compose. (True peer-to-peer between long-lived workers is out of scope; that's what a message bus like pigeon is for.)

Clean-room / benchmark runs get their own target repo. Lanes are worktrees of some repo — don't graft a build experiment onto an unrelated repo's object store. Seed a standalone repo (e.g. under X:\Benching), and vendor any external spec INTO it (spec/…) so packets reference it by relative path — the guard preamble forbids workers building absolute paths, and Codex's sandbox is confined to the lane, so out-of-repo specs are unreadable anyway.

Resume. The journal (.fleetflow/<run>/journal.jsonl) uses the native tool's mechanism: each spawn is keyed by a content hash of (brain, prompt, opts) — and opts includes --effort, so changing only the effort lever is a cache miss (a different run). Re-running ff-spawn with an unchanged packet returns the cached result instantly (exit 3 + path); change the prompt and only that lane re-runs. Corollary (same reason the native tool bans Date.now()): keep timestamps and random values OUT of packet prompts, or the key changes and the cache never hits.

Manifest & resume. Each spawn also upserts a packet into .fleetflow/<run>/manifest.json ({run, base, created_by, phases[], packets[]}, one entry per id — idempotent — carrying {id, brain, phase, prompt_file, worktree, max_turns, effort, schema, key}). It is the orchestrator-side plan, distinct from the per-spawn journal: it records what was intended so a whole run can be replayed. ff-run.sh resume --run NAME snapshots the manifest's packets once, then replays each through ff-spawn in manifest order — unchanged packets cache-hit ("cached"), changed or new ones run live; per-lane summary to stderr, a JSON result list on stdout, exit 0 if all ok/cached, 10 if any lane failed. ff-run status --run NAME is an alias for ff-status. Snapshots matter: ff-spawn re-orders the live manifest on each upsert (remove-then-append), so the replay reads from a frozen copy. When you're done, ff-clean.sh --run NAME [--force] reclaims zero-commit lanes (worktree + branch deleted), keeps committed ones, and removes the run's cache dirs.

Cache & tmp redirect. Workers' UV_CACHE_DIR, TMPDIR, TMP, and TEMP are pointed at ${FLEETFLOW_CACHE_ROOT:-$HOME/.fleet-worker/cache}/<run>-<id>/ (created before launch), so pytest/uv litter and codex's AppContainer-ACL'd sandbox dirs land OUTSIDE the repo and lanes — never inside a worktree that git worktree remove later needs to delete. Set FLEETFLOW_CACHE_ROOT once for the whole run and pass the same value to ff-clean so it can find and remove those dirs.

Patterns ported from the native Workflow tool

Full extraction with evidence in references/native-workflow-insights.md. The ones to actually use:

Adversarial verify: for each finding/lane output, spawn 2–3 refuters prompted to refute, majority kills. Make one refuter a different provider.
Judge panel: N independent build attempts (e.g. Sonnet vs Codex), judged by Opus lanes, synthesize from the winner.
Loop-until-dry: for unknown-size discovery, keep spawning finder lanes until 2 consecutive rounds add nothing new. Dedup against everything seen, not everything confirmed.
Completeness critic: one final lane asking "what's missing?" — its answer is the next round's packet list.
No silent caps: if you bound coverage (top-N, sampling), say so in the run summary. Silent truncation reads as "covered everything".
Workers return data, not prose: every packet ends with "FINAL REPLY: <exact shape>". For machine-parseable results use --schema (Codex --output-schema is native; Claude workers get the schema embedded in the prompt and validated at collect time).

Default posture: verify by default, scale to the ask

The native tool's fan-outs look "automatic" because its doctrine makes them the default the script-author follows, not an option — and real runs routinely hit 30–50 agents on large tasks. fleetflow adopts the same posture:

Every run gets a verify phase unless you state why not. Minimum: one refuter per build lane (cross-provider) + a judge for anything with more than one candidate. A run that skips verification is the exception and says so in its summary.
Scale the fan-out to the ask, not to caution. Mechanical batch → one lane per file-disjoint packet, however many that is. Discovery/audit → loop-until-dry rounds, not a fixed small N. Verification typically adds 0.5–1.5× the build-lane count on top. 20–50 lanes on a big task is the pattern working, not a smell — the native tool budgets 1000 agent calls per run for exactly this reason.
Throttle in waves, don't shrink the plan. The native engine queues past min(16, cores−2) concurrent; fleetflow's orchestrator does the same manually — spawn in waves of ≤4–6 per provider (endpoint quota binds first), collect as lanes finish, keep the total plan intact. Bound each lane (--max-turns), never the ambition.
No silent caps (native rule, verbatim): if you sample, top-N, or skip, say so in the run summary.

Safety — the cage, not the model

Isolation: every mutating worker gets its own worktree lane and (GLM) its own CLAUDE_CONFIG_DIR. Codex workers run --full-auto (sandboxed, workspace-write) confined to their lane via -C.
Codex lanes cannot git commit (learned 2026-07-08, codex-cli 0.142): a worktree's git metadata (HEAD.lock/index.lock) lives under the MAIN repo's .git/worktrees/, outside the lane the sandbox confines Codex to — commits die with a lock-permission error after the work itself succeeded. Convention: Codex packets say "DO NOT COMMIT — leave changes in the working tree", the worker reports FILES_CHANGED, and the orchestrator reviews the diff and commits. (GLM/Anthropic claude -p workers are unaffected and may self-commit.) Tightens the gate as a side effect: nothing a Codex lane produces lands without an orchestrator diff review.
Escape guard (learned 2026-07-05, incident): a worker CAN escape its worktree by writing absolute paths — a GLM worker once wrote its output into the main checkout while its own lane stayed clean. Two mechanical defenses, both defaults: the guard preamble's relative-paths-only clause, and ff-collect.sh --check-main-clean after every run (exit 12 = escape detected; stop, git stash push -u to salvage, investigate).
Baseline-before-closeout (learned 2026-07-08, exit 12 false positive): --check-main-clean compares main against whatever it was when the check runs — if the orchestrator makes its own edits to main (docs, PLAN.md, closeout commits) between spawning lanes and running the check, those self-made edits look identical to an escaped worker's writes. Snapshot a clean-main baseline (git status --short / a commit sha) before any orchestrator-authored closeout edit, so the check compares against the pre-spawn state, not a moving target the orchestrator itself just moved.
Permission posture: workers run non-interactive (bypassPermissions default; FLEETFLOW_PERMISSION_MODE=dontAsk + allowlist when the orchestrator session is in auto mode — a bypassPermissions child is hard-denied there as Create Unsafe Agents). Same doctrine as fleet-worker; see its Permission posture section.
Bounds: --max-turns per worker (default 100), concurrency ≤ 4–6 per provider (endpoint quota is the binding constraint), wall-clock patience via the orchestrator's background-task notifications — never poll-sleep.
Terms: a subscription-authed orchestrator must stay interactive; API-key-authed sessions may be automated. Codex usage bills to the ChatGPT plan. Verify your own plans' terms (fleet-worker "Know your terms" applies).

Scripts

| Script | Purpose | |---|---| | scripts/ff-doctor.sh | --offline structural preflight; --live probes GLM endpoint, Codex auth, Anthropic models, reports orchestrator tier (fable/opus) | | scripts/ff-spawn.sh | uniform spawner: worktree lane + guard preamble + journal + per-brain launch (GLM via fleet-worker, Codex via codex exec, Anthropic via claude -p) | | scripts/ff-collect.sh | per-brain result gate; strips ```json fences before --schema validation; --repair respawns a <id>-repair lane on validation failure; --check-main-clean escape guard | | scripts/ff-status.sh | run status as JSON (lane state, elapsed, commits, tools, tokens, activity, manifest summary); --watch N --out status.json feeds the live monitor | | scripts/ff-run.sh | resume --run NAME replays every manifest packet through ff-spawn in order (unchanged = cached, changed/new = live); status --run NAME aliases ff-status | | scripts/ff-clean.sh | --run NAME [--force] reclaims zero-commit lanes (worktree remove + branch -D), keeps committed lanes, removes the run's cache dirs; reports locked ACL-litter dirs | | scripts/ff-import.sh | --wf DIR --run NAME imports a native Claude Code Workflow run dir (wf_*/) — completed agents become lanes (prompt + result envelope + journal + manifest), started-only agents are flagged incomplete; native keys are terminal, not replayable |

Live monitor (assets/ff-monitor.html): a zero-dependency page reproducing the native /workflows progress surface — run header with square per-lane pips, a mono/technical agent grid, elapsed/tools/ commits/tokens, and expandable per-agent detail (activity, last commit, error tail, artifact). Wire-up: copy it into the run dir as index.html, run ff-status --watch 3 --out <rundir>/status.json, serve the run dir with any static server, open in a browser/preview panel. It polls status.json every 2.5s. Live claude-brain lanes are introspected via the session transcript in their isolated config dir; codex lanes via their --json event stream.

Two surfaces, like the native tool. The served monitor is the live grid (the Background-tasks panel analogue). In-chat, the orchestrator emits a compact snapshot card at phase boundaries (spawn, phase change, all-done) — chat-widget sandboxes cannot poll localhost, so the inline card is a moment-in-time render by design, re-emitted rather than self-updating.

All follow the Skill Resource Protocol: stdout is data, chatter on stderr, semantic exit codes (0 ok, 2 usage, 3 cached/missing, 7 unreachable, 10 worker failed, 12 escape detected), --help with EXAMPLES.

Importing a native Workflow run

ff-import --wf <wf_*/> --run <name> reads a native Claude Code Workflow run directory — its journal.jsonl (started/result records with v2: hash keys and agentId) plus per-agent agent-<id>.jsonl transcripts — and lands each completed agent as a fleetflow lane: the agent's first user-role message (string content or content-array-with-text-blocks, both handled) becomes <id>.prompt.txt, its native result object becomes <id>.result.json ({is_error:false, result:<native-result>|tojson}), and a native-brain packet is appended to the manifest (imported_from: <DIR>) for provenance. Agents with a started but no result get a prompt file only and are reported incomplete on stdout's TSV — respawn candidates.

Caveat — imported results are terminal facts, not a replayable cache. The native v2: keys are content hashes of the native (prompt, opts) call, not fleetflow's sha256(brain+prompt+opts), and native is not a spawnable brain — so ff-run resume skips native packets rather than replaying them (it reports each imported and exits 0). The native script's control flow (pipeline/barrier/loop) is not recovered either. To continue from an imported result, spawn a fresh lane with a real brain and paste the imported result into its packet (the hub-and-spoke handoff). Use import for salvage, provenance, and visual continuity in the monitor — not to resume native work in place.

References

references/native-workflow-insights.md — the extraction: journal format on disk, resume semantics, control-flow doctrine, quality patterns, caps and budget spine, with evidence.
references/worker-contracts.md — per-brain launch/collect/auth contracts (GLM env knobs, full codex exec flag map, Anthropic alias notes) and the Fable/Opus orchestrator probe.
references/native-model-routing.md — per-stage opts.model/opts.effort routing for native Workflow scripts: the cost evidence, the collect-cheap/decide-premium table, caveats (aliases, fork inheritance, effort = reasoning depth).

Agent Skills: fleetflow

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