PR #2181 added affinity: true at the workflow and job level to guarantee all remote steps in a scope run on the same worker node. The feature is shipped but undocumented — users have no way to discover it outside of reading the source.

Proposed Solution

Add documentation for worker affinity to the manual, covering:

What it does: when affinity: true is set on a job or workflow, the dispatch service picks a worker for the first step via normal label/platform matching, then pins all subsequent steps to that same worker.
YAML syntax: show affinity: true at both job and workflow level with examples.
Interaction with placement: affinity requires placement (labels, target, or platform) to have any effect — without placement, steps run locally and affinity is a no-op (a validation warning is emitted).
Failure semantics: if the pinned worker disconnects mid-group, steps fail with WorkerAffinityLostError instead of silently re-dispatching to another node.
Concurrency trade-off: affinity serializes steps on a single worker slot, so a job that would run in 2.6s across two workers takes 5.1s on one.
When to use it: workflows where steps need shared filesystem state, GPU memory, or other node-local resources between steps.

Suggested locations

manual/how-to/worker-fleets/ — new page or section in the existing fleet docs
manual/reference/workflow-yaml/ — add affinity to the field reference for workflow and job schemas

Alternatives

None — the feature exists and needs docs.

02Bog Flow

Closed

8/19/2026, 2:04:48 AM

No activity in this phase yet.

03Sludge Pulse

stack72 commented 8/19/2026, 2:04:53 AM

Shipped

data prune still misclassifies live records as orphans on 20260820 (after #1396) — serve-minted token/grant records, and report data of every live workflow

wss:// direct to serve's own TLS listener still fails on 20260817 — client ALPN lands on h2, WS-over-h2 unimplemented (follow-up to #1363)

Concurrent pushes to one namespace fail with HTTP 409 ConditionalRequestConflict — the conditional PUT is never retried

serve: triggerSource not persisted to workflow run summary

dataOutputOverrides not applied during remote execution — ephemeral resources GC'd before override takes effect

extension rm also deletes the lockfile entry, and install on an empty lockfile is a silent success — rm/install is not a round trip

vault: audit trail should record put, delete, and annotate operations

ExtensionWorkflowRepository scans manifest.yaml as a workflow, emitting 'Unknown key manifestVersion' warning

--max-run-duration only applies to detached runs, not attached runs

Cancel endpoint reports status: cancelled for runs it did not actually cancel

@swamp/git: no way to amend a commit, but push can --force

Installation with new account creation times out

pre-flight checks run on orchestrator, not on worker — breaks remote execution with filesystem-dependent checks

Docs: update cancel endpoint response statuses in REST API reference and workflows page

docs: document --remote-only flag for swamp serve

Swamp serve daemon doesn't run with --hot-reload

serve: include workflowName in HealthSnapshotSchedule

Retyping a model instance strands catalog rows no command can reclaim — prune matches on model_id, delete resolves the current type (follow-up to #1009)

knowledge-base retrieve persists query output into the state resource, with lifetime infinite and the query text in the instance name

Method-name collision between a base model type and an extending extension silently drops the whole extension file — no error, doctor reports pass

Skip 50MB monolithic index rewrite on v2 shard-first path

Share single AwsS3Client instance across lock, sync, and verifier

Double shard assembly per command lifecycle (pull + push both read all shards)

pullChanged never records commitSeq for shard-first (v2) index

localHasAllRemoteEntries() permanently blocks sidecar update on partial caches

serve: workflow.history.get cannot find CLI-created runs or look up by run ID

"TRIAL ENDED" modal shown to team plan user when toggling extension visibility

Concurrent suspended workflow runs can't be disambiguated from 'approvals'; fresh runs should supersede matching-input suspended runs

I _think_ I might like a guard in the trigger yaml

swamp cmds don't realise the user is sshed into the system

serve dashboard: add cluster.instances and serve.config endpoints

CEL expressions have timestamp/duration but no current-time value, so no guard can express "older than N"

Support direct type execution (@type) with --server

access token mint writes to user vault, not serve's _token-secrets control plane in HA mode

Generic OTLP endpoint appends signal path after query or fragment

Issue lifecycle start drops top-level issue comments

serve dashboard: add instanceId, triggerSource, and step progress to WorkflowRunSummary

Document worker affinity (affinity: true) for workflows and jobs

Datastore MongoDB driver leaks connections — 5960 accumulated over 8 days

workflow approvals displays the latest run's prompt for every suspended run

@swamp/git: add a read-only working-tree diff for pre-commit review

docs: document --oauth-client-name flag for swamp serve

Docs: update workflow reference to include trigger in JSON output shapes

@swamp/git branch and push methods fail data naming when branch contains '/'

Docs: update workflow-placement.md for job/workflow-level placement inheritance

feat(serve): use identifiable OAuth client_name instead of random UUID

@swamp/git does not pass AbortSignal to Git subprocesses

Global Secret Manager methods build an invalid regional parent

Document model.method() support in assert expressions

No way to store code-review results — verdicts, findings, and cost are not persisted for any repo

Redaction regex boundary bug: label_base64 secrets with an unrecognized label pass through unredacted (e.g. swamp_ API keys)

User token page (/u/<user>) shows only "swamp_..." for every API key, making leaked-key identification impossible

upstream_state treats sparse-fetch branches as having no upstream

Add native support for the Pi coding harness

Cloud Build create supplies project instead of required projectId path parameter

workflows: support labels/target/platform at job and workflow level

swamp access grant create never registers the grant — a --deny created this way silently fails open

Support credentials in datastore config (vault-resolvable)

swamp serve OOMs on repos with 2000+ model definitions

Serve telemetry attribution for collectives

Extension workflows: no way to override trigger configuration

Add a list/discover method to the generated @swamp/aws types — no way to enumerate resources in a region

Document @vault= prefix for webhook secrets in serve.yaml

swamp access grant create installs an unrelated extension from the registry

docs: document SWAMP_API_KEY headless OAuth bootstrap for swamp serve

workflow-succeeded selects the globally-latest run, so siblings block each other under parallel use

swamp serve: webhook secrets should support @vault= resolution

Misleading collective_not_trusted auto-resolve error when a local source extension transiently fails to index during workflow validate

datastore setup: symlinks not counted in bytesCopied, causing misleading '(0B)' output

vault.get() CEL error embeds raw newline when wrapped by model resolver, producing broken output

Feature: user-configurable redaction rules (.swamp/redaction.yaml)

Fatal JavaScript out of memory: Ineffective mark-compacts near heap limit

Sync every signup to Attio, and backfill the existing population (#809 follow-up)

@swamp/issue-lifecycle probes /api/health, which swamp-club stopped serving when the Fresh scaffold stubs were removed

Lab lifecycle POST rejects any payload string that starts with a dollar sign, not just operator keys

Feed: detect and gracefully handle dead (404) post links (link rot)

/feed: per-post unread indicators and mark-as-read to track reading progress

/feed: filter and search by author, title/text, and topic

Add a :micdrop: emoji / reaction shortcode (swamp-native art included)

Push down the two cheap leaderboard scans: ghost-gate dictionary and eventCounts owner filter