Exhaustive completion discipline for long, complex, or multi-item tasks (1:1 ports, migrations, sweeping refactors, batch changes) - mechanical inventory of every work unit, a persistent coverage ledger, per-item verification, and an evidence-based completion gate that forbids declaring done while anything is missing. Use whenever a task spans many files or items, is likely to outlive one context window, or asks to port, migrate, convert, or replicate something completely.
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Exhaustive completion discipline for long, complex, or multi-item tasks (1:1 ports, migrations, sweeping refactors, batch changes) - mechanical inventory of every work unit, a persistent coverage ledger, per-item verification, and an evidence-based completion gate that forbids declaring done while anything is missing. Use whenever a task spans many files or items, is likely to outlive one context window, or asks to port, migrate, convert, or replicate something completely.
Apply to any task with more than a handful of work units: 1:1 ports, language/framework migrations, repo-wide refactors, "implement all X", multi-feature builds, large integrations.
Owns inventory, coverage tracking, and completion claims. Subtask decomposition lives in core-engineering-policy; per-change review lives in code-review-policy; test strategy lives in testing-policy.
Core Principle
Completeness is measured against an enumerated inventory, never against memory or impression. "It looks done" is not evidence; an empty pending list plus passing verification is.
An unfinished task reported honestly is acceptable. A finished-sounding report with silent gaps is a failure, and the most common failure mode of long tasks - this policy exists to prevent it.
Phase 1 - Inventory (Before Any Implementation)
Enumerate EVERY unit of work mechanically, with deterministic commands, not by recalling or sampling:
Port/migration: all source files, public symbols/exports, endpoints, CLI commands, config keys, assets (file listings, grep counts, compiler/AST symbol dumps).
Multi-item feature work: every item from the spec, issue, or user message, one per line.
Record the counts (e.g. "src: 87 files, 412 exported functions"). Counts are the completion oracle for Phase 3.
Persist the inventory as a checklist artifact that survives context loss: a file in the working tree (e.g. .task/coverage.md) or the runtime's persistent todo/task system. One line per unit with status pending, done, blocked(<reason>), or deferred(<user-approved reason>).
If the full inventory cannot be enumerated, that is a blocker to surface and resolve (narrow the scope with the user) - never silently work on a sample of it.
Phase 2 - Execute Against the Ledger
Work unit by unit (or in coherent batches). Flip a unit to done only after its own verification - it compiles/typechecks, its tests pass, or a smoke check ran - never because a similar unit worked.
Never silently skip, stub, or simplify a unit. A stub, TODO, or partial implementation keeps the unit pending or blocked with the reason recorded. Schedule hard units early; difficulty is a reason to start sooner, not to defer.
On context compaction, session resume, or sub-agent handback: re-read the ledger FIRST and continue from it. Never reconstruct progress from memory - that is where items get dropped.
Sub-agents must report which ledger units they completed and how each was verified; unverified claims stay pending.
Phase 3 - Completion Gate (Before Saying "Done")
A completion claim is forbidden unless ALL of these hold:
The ledger has zero pending and zero blocked units. deferred units require the user's explicit approval and must appear in the final report.
Counts reconcile mechanically: target counts match the inventory (files ported vs source files, symbols vs symbols, endpoints vs endpoints). Run the comparison commands; never estimate.
The whole artifact builds/compiles/typechecks and the test suite (or smoke run) passes - not just the last file touched.
A final sweep finds no incompleteness markers introduced by this task: grep the produced code for TODO, FIXME, "not implemented", placeholder/stub patterns. Every hit is fixed or explicitly reported.
Self-review per code-review-policy.
If any check fails, the task is NOT done: state exactly what remains and keep working (or report the blocker). Never say "everything is complete", "fully ported", or "all done" while the ledger has open units.
Words like "complete", "all", "every", and "fully" in a final report are claims that must be backed by checks 1-4.
Honest Reporting
The final report must state: total units, done, deferred (with approval), and the verification evidence (commands run and their results).
Anything that could not be verified is reported as unverified. Never upgrade unverified to done.
Never offload doable work to the user. "You can adjust X yourself", "refresh the lockfile if you prefer", "wire the remaining seam when needed" in a final report are deferrals in disguise: if the agent can execute the action (edit the pin, refresh the freeze, run the migration, wire the seam), it does so BEFORE reporting. Hand work to the user only when it genuinely requires them - credentials or access the agent lacks, irreversible or destructive choices, or business decisions - or when the user explicitly approved deferring it.
Token Efficiency (Coverage Without Burning Tokens)
Enumerate and count with shell commands (ls/find/grep/wc, compiler output), not by reading files into context. The ledger lives on disk, not in the conversation.
Read each source unit once, when implementing it; do not re-read finished units. The ledger status is the cache - never re-verify unchanged units.
Verify per unit with the cheapest sufficient check (typecheck one file, run its tests); reserve full-suite runs for batch boundaries and the completion gate.
Batch trivial units (constants, type-only files) into one pass and spend the saved tokens on the hard units.
Update the ledger with small status-line edits, not full rewrites.
