RFC: workspace task orchestration - #23
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pnpm -r run computes a real dependency graph and then discards it.
sequenceGraph hands a project-to-dependencies map to graph-sequencer and
returns {chunks, safe}; sortFilteredProjects returns .chunks and drops
safe, and runRecursive then awaits each chunk in turn. A project whose
own dependencies finished in the first second waits for the slowest,
least related project in its chunk.
Replace the chunk barrier with per-task scheduling over the graph the
sequencer already builds. For an unconfigured workspace this changes
nothing about what runs or in what relative order — only about when a
task may start.
Add dependsOn with Turborepo's ^ convention, defaulting to
['^<own name>'] so today's behaviour is the default and no existing
command changes meaning. A missing script is a satisfied edge that
passes through to that project's own upstream tasks, so a pass-through
package does not sever a chain — the rule the task cache RFC needs to
key a task on the upstream tasks that actually produced what it reads.
Redefine the three flags currently specified against the chunk list
(--resume-from, --reverse, output mode), state what --bail means when
tasks fail mid-graph, make task-graph cycles an error rather than an
arbitrary order, and add --dry-run because a task graph nobody can
inspect is one nobody can debug.
Excludes watch mode, a visualizer, non-script tasks, and caching.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Important Approval pendingCodeRabbit has no unresolved comments, but it could not review the latest commit because the review limit was reached. Follow the review guidance in this comment to continue. 📝 WalkthroughWalkthroughThe RFC proposes dependency-aware workspace task scheduling. It defines task configuration, cross-workspace dependencies, graph traversal, cycle errors, flag behavior, graph-aware dry runs, implementation sequencing, and explicit scope exclusions. ChangesWorkspace task orchestration
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: 🟡 Moderate · up to The proposal changes recursive task scheduling and introduces task-graph behavior, but key contracts for ordering, failures, cycle detection, resume behavior, and dry-run output remain undefined. That can lead to inconsistent execution and tooling behavior, so the RFC needs those decisions resolved or explicitly accepted before merge. Poem
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zkochan
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August 26, 2026 22:02
PR Summary by QodoRFC: Introduce dependency-aware workspace task orchestration
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In `@text/0000-workspace-task-orchestration.md`:
- Around line 37-39: Update the scheduler behavior documentation to state that
it preserves dependency order only; independent tasks may start or complete in a
different order, and their side effects may be reordered. Revise the claims
around the per-task scheduler and default configuration so they no longer
promise unchanged relative ordering or behavior for independent projects.
- Around line 82-84: Define dry-run output as a partial-order representation
rather than an unspecified execution order: document a stable JSON schema for
task identifiers and dependency edges, and specify the deterministic
tie-breaking rule for independently runnable tasks. Clarify whether
human-readable output shows a topological or dispatch order, and ensure the
`--json` form exposes enough information to reconstruct dependencies without
implying a unique order.
- Line 78: Update the task orchestration specification for --no-bail and --bail
to define task states, summary reporting, and final exit codes: failed tasks
must be reported as failed, transitively blocked dependents as skipped rather
than failed, and independent runnable tasks must continue under --no-bail; under
--bail, stop dispatching new tasks after the first failure while allowing
already-running tasks to finish, then report blocked dependents as skipped and
return the documented failure exit code.
- Line 5: Update the workspace task cache reference in the RFC text to link to
text/0007-shared-side-effects-cache.md instead of the nonexistent
text/0000-workspace-task-cache.md.
- Line 106: Define cycle detection over the invocation-specific task graph,
after task selection and missing-script pass-through normalization but before
scheduling; do not reject filtered commands because of cycles involving
unselected tasks.
- Around line 74-75: Clarify the RFC’s task-resolution rules for --resume-from:
define how a project-only value maps to the (project, script) task for recursive
run, including missing-script pass-through behavior, and define which task is
selected for recursive exec when no script name exists. State the deterministic
task identity and transitive-dependent closure used before resuming execution.
- Line 82: Update the dry-run command specification to use the recursive form
pnpm -r run --dry-run <script>, explicitly excluding root-level tasks and
describing it as a new recursive-run feature rather than existing pnpm run
behavior; retain the task graph and --json output requirements.
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text/0000-workspace-task-orchestration.md
[style] ~9-~9: To elevate your writing, try using a synonym here.
Context: ...has the parts of a task runner that are hard to retrofit: a filter language with dep...
(HARD_TO)
[style] ~58-~58: Consider an alternative for the overused word “exactly”.
Context: ...pendsOn: ['^']`, which is exactly what the current chunking implies. A wo...
(EXACTLY_PRECISELY)
[style] ~100-~100: Consider shortening this phrase to just ‘whether’, unless you mean ‘regardless of whether’.
Context: ...ost pnpm imposes on its own users today whether or not they want a task graph, and because the...
(WHETHER)
The relative-order claim was wrong. Dropping the chunk barrier does reorder independent tasks against each other — if a:build finishes early, b:build may start while an unrelated c:build is still running, which chunking prevented. Say so, say which tasks it can bite (shared files, fixed ports, a shared output directory), and note that such tasks were already racing whenever they shared a chunk. State the guarantee that does hold: dependency order, nothing more. Decide failure handling instead of leaving it open. Four task states; dependents of a failed task are skipped, never failed, in both modes; --no-bail continues every subtree whose dependencies passed; the exit code is non-zero iff at least one task actually failed, since counting a blocked dependent too would report two problems where there is one. Scope cycle detection to the invocation's graph, after selection and pass-through, rather than to the workspace at config load — otherwise a cycle in a corner nobody selected fails everyone's filtered run. Define dry-run output as a partial order: --json emits nodes and edges with stable (project, script) identifiers, and the human-readable form prints one valid linearization with a deterministic tie-break so two dry runs diff meaningfully. Correct the spelling to the recursive form and note that --dry-run does not exist on run today in either form. Sharpen the --resume-from question — the flag names a project while a task is a pair, and exec has no script name at all — and record that ^ was chosen over Rush's upstream/self on installed-base grounds. Link the cache RFC by PR rather than by a filename that does not exist on this branch. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
The flag names a project while a task is a (project, script) pair, and exec has no script name at all. Specify all three: it still names a project and resolves to that project's task for the invocation; exec has one task per project so there is no ambiguity; an unselected project is RESUME_FROM_NOT_FOUND as today, and a selected project without the script resolves to its pass-through node, since a scriptless project is a valid anchor under the chunk list and a graph should not be pickier. Change the resume set. The earlier proposal — the anchor and its transitive dependents — is wrong: after --bail stops a run, work unrelated to the failure has not run either, and a dependents-only closure skips it silently. The resume set is every selected task except the anchor's transitive dependencies, which is the graph-native reading of "from that chunk onward" and skips exactly what is known to have finished. Replace the old unresolved question with the one actually underneath it: inferring completion from graph position holds for a resume after a failure and not for an interrupted or deliberately partial run, which is an argument for persisting per-task run state. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
This was referenced Aug 26, 2026
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Replace the chunked topological scheduler of recursive run/exec with
per-task scheduling in both stacks: a task — a (project, script) pair —
becomes runnable when every task it depends on has completed
successfully, and runnable tasks are dispatched under the
workspace-concurrency limit with no barrier between
dependency-independent tasks.
A new "tasks" section in pnpm-workspace.yaml declares task dependencies
with the caret convention ("^build" = the task in each workspace
dependency, "build" = the task in the same project). A task with no
entry behaves as depending on its own name in the workspace
dependencies, which is exactly what chunking implied. A project without
the script becomes a pass-through node that is reported skipped and
keeps the chain intact.
Also per the RFC: task-graph cycles are ERR_PNPM_TASK_CYCLE naming the
participating tasks, scoped to the invocation's selected graph, with
ignoreWorkspaceCycles: true downgrading the error to a warning;
--resume-from excludes exactly the anchor's transitive dependencies;
--reverse runs the reverse graph; under --no-bail dependents of a
failed task are reported skipped and do not add to the exit code; with
--bail, the first failure ends the run at once and nothing new is
dispatched; output is inherited only when at most one script can ever
be in flight; and pnpm -r run --dry-run [--json] prints the resolved
task graph without running anything (the verify-deps check included).
Implementation: the projects sorter exposes the tunneled dependency-edge
map (filteredProjectsDependencies / filtered_projects_dependencies)
instead of only its flattened chunks; the recursive summary is
task-keyed (dependsOn-pulled tasks get "<dir>#<task>" keys); pacquet's
inert --sequential now means concurrency 1 and its --no-sort
resume/reverse handling is aligned with the TypeScript CLI; the dead
chunk helpers are removed.
Related to pnpm/rfcs#23
This was referenced Aug 27, 2026
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pnpm -r runcomputes a real dependency graph and then throws most of it away. This RFC stops discarding it, and addsdependsOnso a task can depend on something other than the same-named script in its workspace dependencies.No caching here — that is #22, which depends on this one.
The scheduler is the naive one
runRecursive.ts:109is, in outline:Every project in chunk N finishes before any project in chunk N+1 starts. A project whose own dependencies completed in the first second waits for the slowest, least related project in its chunk. That is a cost
pnpm -r runandpnpm -r execimpose on every user today, with no configuration involved.The graph is not missing —
sequenceGraphhands a project-to-dependencies map to@pnpm/deps.graph-sequencerand gets back{ chunks, safe };sortFilteredProjectsreturns.chunksand dropssafe. The proposal is mostly stop flattening.dependsOnTurborepo's
^convention, inpnpm-workspace.yaml:The default is today's behaviour — a task with no entry behaves as
dependsOn: ['^<its own name>']— so an unconfigured workspace gets the scheduler improvement and nothing else changes meaning.A missing script is a satisfied edge that passes through to that project's own upstream tasks, so a pass-through package cannot sever a chain. #22 depends on this rule for cache-key correctness.
The largest barrier in a typical workspace is not the chunk boundary but the
&&betweenpnpm -r run buildandpnpm -r run test, which only a declaration can remove. The two halves are separable in implementation — and should ship scheduler first — but not in argument.Also specified
safeis discarded and a cyclic graph runs in whatever order the sequencer picked, succeeding or failing by luck.--resume-from,--reverse, and thestdioinherit/pipe condition are all currently defined against the chunk list and need redefinition.--bailneeds a stated meaning when tasks fail mid-graph: dependents are reported skipped, not failed.--dry-runwith--json, because the first question anyone asks of a task graph is why something did or did not run.Not in scope
Watch mode, a visualizer, a new terminal UI, non-script tasks, root tasks, and caching. Each is self-contained and none changes the scheduler or the graph; bundling them would make this a referendum on how much of a task runner pnpm should be rather than on whether the scheduler should stop discarding the graph.
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The
taskskey name,--resume-from's new semantics, whether a failed dependency skips or fails its dependents, per-task concurrency limits, whatpnpm -r execcan participate in, and whether making existing silent cycles an error needs a deprecation window.🤖 Generated with Claude Code
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