| name | moe-epic-breakdown |
| description | Use when an architect is turning an epic into a set of tasks (moe.create_task), before planning any single one. Covers where to cut the seams, how to size and order tasks, what each task's Definition of Done must carry, and the mandatory final integration-and-hardening task. Distinct from moe-planning, which plans the steps inside one task. |
| when_to_use | Architect facing an epic with no tasks yet, or an epic whose remaining work needs re-slicing. Run this before moe.create_task; run moe-planning later, per task. |
| allowed-tools | Read, Grep, Glob, WebFetch |
Moe Epic Breakdown
Your job: turn one epic into an ordered set of tasks a fleet can execute mostly in parallel, without stepping on each other and without any single task being unreviewable.
This is the layer above moe-planning. Breakdown decides what the tasks are; moe-planning decides what the steps inside one task are. Don't do both in one pass โ you'll produce tasks shaped like steps.
Before you cut anything
- Read
epic.description, epic.architectureNotes, and epicRails. The rails constrain the seams: a rail like "all auth endpoints under /api/auth/" is telling you where a boundary already exists.
moe.list_tasks {epicId} โ the epic may already be partly sliced. Never duplicate an existing task; extend or re-order instead.- Explore the actual code before naming a seam (
explore-before-assume). A breakdown built on a module that doesn't exist produces N tasks that all get reopened.
Where to cut
Cut on seams that already exist in the code, in this order of preference:
- Module / package boundary โ daemon vs proxy vs plugin. Best seam: independent test suites, independent review.
- Layer boundary within a module โ schema/state โ tool โ wire โ UI. Natural dependency order falls out for free.
- Contract boundary โ one task defines and lands the type/tool/endpoint, later tasks consume it. The producer goes first and its DoD includes the contract being usable, not just declared.
- Vertical slice of behavior โ one complete user-visible capability end to end. Use when the layers are too entangled to cut horizontally; costs parallelism, buys shippability.
Anti-seams โ do not cut here:
- By phase of work. "Write tests" / "write code" / "write docs" as separate tasks is a step list wearing a task costume. Each task owns its own tests.
- By file. Files move. A task scoped to a file becomes a merge conflict with a plan attached.
- By agent convenience. Splitting so three workers are busy, when the second and third can't start until the first lands, just adds handoff cost.
Sizing
Target: a task a competent worker finishes in one session, producing a diff a reviewer can hold in their head.
| Signal | Action |
|---|
| DoD has more than ~6 items | Split it |
| Touches 3+ packages | Split on the package seam, unless it's a single mechanical rename |
| The title needs the word "and" | Usually two tasks โ check whether the halves can land independently |
| It can't be described without describing another unfinished task | Merge them, or make the dependency explicit via order |
| Under ~30 minutes of real work | Merge it into its neighbour; per-task overhead (claim, plan, review) exceeds the work |
Ordering and dependencies
order is the only dependency signal the runtime has โ there is no dependency graph in the schema. So:
- Producers before consumers. If task B imports what task A creates, A gets the lower
order.
- State the dependency in plain text in B's
description ("depends on the SkillMarker type from task-โฆ"), because nothing enforces it. A worker who claims B early needs to be able to see that.
- Prefer orderings where the first 2โ3 tasks are genuinely independent โ that's what lets a fleet parallelize at all.
- Tasks land in
BACKLOG and are human-gated into PLANNING; ordering is advice to the human and to the governor, not a lock.
What every task must carry
definitionOfDone: verifiable claims, not intentions. "moe.list_tasks returns tasks filtered by epicId" โ not "epic filtering works."- Its own tests. Every task tests its own behavior. This is not deferred to the final task.
taskRails only where this task needs a constraint the epic rails don't already impose.- Enough
description that a worker who has read neither the epic nor the sibling tasks can start.
End the epic with an integration-and-hardening task
Always create one, at the highest order, unless the epic is 1โ2 tasks total. It exists because verification is concentrated, not smeared โ see moe-planning's "Where the gate goes". Mid-epic tasks prove their own slice with focused tests and move on; this task is where the epic actually gets gated.
Its DoD covers what no individual slice could see:
- Full regression across every package the epic touched, green, with numbers.
- Integration / end-to-end coverage of the epic's whole flow โ the first point at which that flow exists to be tested.
- The docs sweep for the epic (held back from the individual tasks so the same file isn't re-edited five times).
- An adversarial pass over the whole epic diff, looking for what the slices got wrong about each other: contracts drifted between producer and consumer, duplicated helpers, a migration that works alone but not in sequence, error paths that only fail in combination.
- Any deferred cleanup the mid-epic tasks explicitly parked.
If the epic touched shared types, schema, wire protocol, or migrations, say so in this task's description โ those get full regression at every position, and this task confirms the whole set still composes.
When not to break down
- The epic is one coherent change (a single bug, one config surface). Make it one task and go.
- Requirements are ambiguous enough that the seams are guesses โ
moe.report_blocked, or ask the human in the REPL. A wrong breakdown is more expensive than a late one: every task inherits the bad seam.
Handoff
Create the tasks, then stop. Each one gets planned separately โ when it reaches PLANNING and you claim it, that's when moe-planning runs, with the task's epic position already decided here.
