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fix(adapters,plugins,edge): an older saas bundle, pulled or pushed, doesn't roll the server back - #1119
The Skilled OpenAPI plugin takes signed bundles from a saas source: pulled at startup, on each poll or on a Worker's Cron run, and pushed to POST /__skilled_openapi/push with enableWebhook. It checked a bundle's push token, schema and signature, but never its version. So a validly signed older bundle was applied, kept as the last good bundle, and rolled the server back. Two ways to get there:
a captured bundle pushed again later, under a fresh push token (the token isn't bound to the body);
an old version served again by a misbehaving or compromised bundle server.
Now a bundle from the saas source, pulled or pushed, is applied only when it isn't older than the bundle being served.
The ordering rule. A bundle's version is any string of 1 to 256 characters: the schema doesn't require semver, compileSkilledBundleFromOpenApi() takes it as given, and real bundles use 1.0.0, 7 or 2026.05.01-1. Every bundle has a generatedAt, which the schema requires to be a parsable date and the signature covers. So:
Two semver versions compare by semver precedence, whatever their generatedAt.
The same version, or versions that aren't both semver, compare by generatedAt.
An equal version and generatedAt is the same bundle: it applies as before, since every poll pulls the served bundle again.
Refusing to order non-semver versions, and accepting only an exact match, would block every update of a bundle versioned 1, 2, ... So the rule falls back to generatedAt instead.
The same version with other content. A hotfix re-signed under the same version is plausible, so it applies when its generatedAt is later. An earlier build of that version, as a replay would be, is refused.
Where it runs.
The source declares the policy: SkillBundleSource.forwardOnly, true on SaasPullSource unless allowRollback. This matches how a source already declares push and keepBundle.
BundleSyncService.apply() enforces it, as a third gate after the pin and signature gates. It runs inside the apply queue, so it compares with the bundle actually served, and pulls and pushes can't race it.
It runs after the signature check, so a tampered bundle reports its signature failure, and the version it compares is a signed one.
409 for a push. The bundle itself is valid. It conflicts with the server's current state, the served version, so it answers 409 bundle_outdated, next to 409 push_replayed. 422 bundle_not_applied stays for a bundle whose own content fails its checks. The separate error code tells the bundle server to send a newer version, not to fix the bundle.
A deliberate rollback.
allowRollback: true on the saas source, validated by its Zod schema, applies an older bundle. It sits on the source, next to enableWebhook and pollIntervalMs, because only that source orders versions.
It is .optional(), not .default(false), so the exported SaasSourceOptions type stays compatible for code that builds a SaasPullSource by hand.
The docs also name the other way: publish the earlier content under a newer version.
What stays.
static, npm and inline sources apply any bundle, as before. Their bundles come from the deployer's own files or code, so a watched file edited back to an older version is a deliberate edit.
The pin gate is unchanged: a pinned store refuses every bundle.
The cache: a start has no served bundle, so it serves what it pulls, or the cached bundle when the pull fails. A refused bundle is never kept, so the cache keeps the newer one.
Scenarios covered: B2 (the saas pull per poll, and the cache), B3 (a bundle that isn't applied leaves the served one), B6 and J2 (pushed bundles on a managed Cloudflare Worker).
User-facing change
What changed:
A pulled or pushed saas bundle older than the served one is not applied and not kept. The log says [bundle-sync] bundle <id>@<version> not applied: older than the served bundle <id>@<version> (generatedAt <date>).
A push of such a bundle answers 409 { "error": "bundle_outdated" }.
New option allowRollback on the saas source, and managed.allowRollback on @frontmcp/edge.
New export compareBundleVersions() from @frontmcp/adapters/skills.
New optional forwardOnly on SkillBundleSource, and refusal?: 'outdated' on BundleApplyResult.
Before → after: a validly signed acme:billing@1.4.0, pulled or pushed while 1.5.0 is served, was applied and replaced the cached bundle. Now it is refused, 1.5.0 keeps serving and stays cached, and a push answers 409. With allowRollback: true it applies, as before.
With the gate turned off, 3 of the 5 new integration tests fail, so they test the fix.
Summary by CodeRabbit
New Features
Managed bundle updates now move forward by default. Older bundles are not applied or cached, and push attempts to publish one return a 409 bundle_outdated response while keeping the currently served bundle active.
Enable allowRollback to permit older bundles. Bundle ordering uses semantic versions when both versions are valid and differ; otherwise, it uses the bundle generation time.
Documentation
Updated deployment and configuration guides with bundle ordering, rollback options, and outdated-push response details.
…rved is not applied
The Skilled OpenAPI plugin checked a pulled or pushed bundle's signature, schema and push
token, but never its version. A validly signed older bundle, replayed after its push window
or served again by the SaaS, was applied, kept as the last good bundle, and rolled the
server back.
A bundle from the saas source is now applied only when it isn't older than the served one.
Two semver versions compare by semver; the same version (a re-signed hotfix), or versions
that aren't both semver, compare by generatedAt, which the signature covers. A refused
pull is logged and the served bundle stays cached; a refused push answers 409
bundle_outdated. allowRollback on the saas source, or managed.allowRollback on the edge,
applies an older bundle on purpose. Static, inline and npm sources are unchanged.
Managed SaaS sources now compare incoming bundles with the served bundle and reject older bundles by default. Version ordering uses semver when both versions are semver and otherwise uses generatedAt. The allowRollback option permits older bundles. Outdated pushes return HTTP 409.
Changes: Managed bundle ordering
Layer / File(s)
Summary
Version ordering and source policy libs/adapters/src/skills/bundle/bundle-version.ts, libs/adapters/src/skills/source-options.ts, libs/adapters/src/skills/sources/*, libs/adapters/src/skills/__tests__/*, libs/edge/src/managed.ts, libs/edge/src/__tests__/managed.spec.ts, plugins/plugin-skilled-openapi/README.md, libs/edge/README.md, libs/skills/catalog/frontmcp-deployment/references/deploy-to-cloudflare-skills-only.md
The adapter compares versions by semver precedence when both versions are semver and otherwise by generatedAt. SaaS sources expose forwardOnly, and managed edge options forward allowRollback. Documentation describes these options and ordering rules.
BundleSyncService refuses older bundles from forward-only sources after signature verification. The push flow returns HTTP 409 with bundle_outdated for this refusal.
Integration and end-to-end tests check older-bundle rejection, served and cached bundle preservation, and rollback behavior when allowRollback is enabled.
sequenceDiagram
participant PushClient
participant BundlePushFlow
participant BundleSyncService
participant compareBundleVersions
PushClient->>BundlePushFlow: submit signed bundle
BundlePushFlow->>BundleSyncService: applyPushed(bundle)
BundleSyncService->>compareBundleVersions: compare incoming and served versions
compareBundleVersions-->>BundleSyncService: comparison result
BundleSyncService-->>BundlePushFlow: outdated refusal
BundlePushFlow-->>PushClient: HTTP 409 bundle_outdated
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Possibly related PRs
agentfront/frontmcp#1094: Implements the SaaS pushed-bundle handling and BundleSyncService paths that this change extends with version ordering.
agentfront/frontmcp#1100: Changes SaaS apply serialization and last-applied-bundle caching, which this change verifies remain unchanged after older bundles are refused.
agentfront/frontmcp#1098: Adds SaaS bundle-pull and cache-fallback end-to-end coverage that this change extends with older-version cases.
Suggested reviewers:alexmercerpo
Merge Risk: Low · previous review 86541
Built-in SaaS sources retain the intended rollback protection, but a custom forward-only source could apply a bundle with an invalid timestamp. This bounded risk can be fixed or explicitly accepted before merging.
Pre-merge checks: 5
Check name
Status
Explanation
Title check
The title names the main change: older saas bundles, whether pulled or pushed, no longer roll the server back. It also lists the affected packages (adapters, plugins, edge). The changeset matches this…
Description check
The description follows the template. It has the 'What and why' section, which explains the rollback bug, the ordering rule, the 409 push response, and the allowRollback option. It has the 'User-facin…
Docstring Coverage
Docstring coverage is 66.67% which is sufficient. The required threshold is 65.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentati…
Linked Issues check
Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check
Check skipped because no linked issues were found for this pull request.
Full details: Title check
Explanation
The title names the main change: older saas bundles, whether pulled or pushed, no longer roll the server back. It also lists the affected packages (adapters, plugins, edge). The changeset matches this: the version-ordering gate in BundleSyncService, compareBundleVersions, the allowRollback option, and the 409 bundle_outdated push response. The title is long (96 characters), but it is specific and on topic.
Full details: Description check
Explanation
The description follows the template. It has the 'What and why' section, which explains the rollback bug, the ordering rule, the 409 push response, and the allowRollback option. It has the 'User-facing change' section with what changed, before and after, affected docs pages, and catalog entries. It has the 'Tests' section, which lists the added tests and the run results. It is thorough and specific.
Full details: Docstring Coverage
Explanation
Docstring coverage is 66.67% which is sufficient. The required threshold is 65.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 3 functions across 16 files. (3 skipped: 3 unsupported.)
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Actionable comments posted: 1
Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @libs/adapters/src/skills/bundle/bundle-version.ts:
- Line 19: Update the forward-only gate that uses compareBundleVersions so it
permits a bundle only when the comparison proves it is newer than or equal to
the previous bundle; treat an unordered result such as NaN as a refusal,
preserving fail-closed behavior for invalid generatedAt values.
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…t order against the served one
compareBundleVersions returns NaN when the order falls to a generatedAt that isn't a date. The gate tested < 0, so such a bundle from a custom source was applied. It now applies only a bundle the comparison proves not older.
* Cherry-pick: fix(adapters,plugins,edge): an older saas bundle, pulled or pushed, doesn't roll the server back
Cherry-picked from #1119 (merged to release/1.11.x)
Original commit: d88f422
Co-Authored-By: frontegg-david <69419539+frontegg-david@users.noreply.github.com>
* Cherry-pick: fix(sdk,plugins): an @app's Skilled OpenAPI credential resolver reaches execute_action and this.callTool() of an operation
Cherry-picked from #1120 (merged to release/1.11.x)
Original commit: 00a3b00
Co-Authored-By: frontegg-david <69419539+frontegg-david@users.noreply.github.com>
* Cherry-pick: fix(adapters,plugins,edge): a push token replayed to another replica or Worker isolate is refused
Cherry-picked from #1122 (merged to release/1.11.x)
Original commit: 1341026
Co-Authored-By: frontegg-david <69419539+frontegg-david@users.noreply.github.com>
* Cherry-pick: fix(plugins): a skill a skills:filter hook hides can't be run by naming its actions
Cherry-picked from #1123 (merged to release/1.11.x)
Original commit: a081fbf
Co-Authored-By: frontegg-david <69419539+frontegg-david@users.noreply.github.com>
* Cherry-pick: fix(sdk): a plugin listed twice in one plugins list is refused at startup instead of keeping only its last entry
Cherry-picked from #1127 (merged to release/1.11.x)
Original commit: 3dbadd3
Co-Authored-By: frontegg-david <69419539+frontegg-david@users.noreply.github.com>
* Cherry-pick: fix(plugins,edge): a Cron run that doesn't apply its bundle fails, and /readyz says the bundle served is stale
Cherry-picked from #1128 (merged to release/1.11.x)
Original commit: 4938d21
Co-Authored-By: frontegg-david <69419539+frontegg-david@users.noreply.github.com>
* Cherry-pick: fix(sdk): connect() with an authToken connects an anonymous caller again on a server without auth
Cherry-picked from #1129 (merged to release/1.11.x)
Original commit: 3d238da
Co-Authored-By: frontegg-david <69419539+frontegg-david@users.noreply.github.com>
* Cherry-pick: fix(auth,adapters,plugins,edge): operators can tell why a pull or push token was refused, while callers still get the generic answer
Cherry-picked from #1130 (merged to release/1.11.x)
Original commit: 913f4f5
Co-Authored-By: frontegg-david <69419539+frontegg-david@users.noreply.github.com>
* Cherry-pick: fix(sdk,auth,plugins): this.authProviders works: the SDK wires the AuthProviders vault from a new authProvidersVault option
Cherry-picked from #1131 (merged to release/1.11.x)
Original commit: e14c30c
Co-Authored-By: frontegg-david <69419539+frontegg-david@users.noreply.github.com>
* Cherry-pick: fix(sdk,auth): /oauth/connect connects a verified caller who has no vault yet, and asks an anonymous one to sign in
Cherry-picked from #1132 (merged to release/1.11.x)
Original commit: f46a87a
Co-Authored-By: frontegg-david <69419539+frontegg-david@users.noreply.github.com>
* Cherry-pick: fix(sdk,plugins): the SDK skill surfaces say a plugin's skills haven't loaded yet, retryable, and carry bundleVersion
Cherry-picked from #1133 (merged to release/1.11.x)
Original commit: 0d1dc94
Co-Authored-By: frontegg-david <69419539+frontegg-david@users.noreply.github.com>
* Cherry-pick: fix(sdk,auth,cli,plugins): the credentials-required error keeps its connect link out of the message, and asks through URL elicitation where the client supports it
Cherry-picked from #1134 (merged to release/1.11.x)
Original commit: 6d8ea24
Co-Authored-By: frontegg-david <69419539+frontegg-david@users.noreply.github.com>
* Cherry-pick: fix(sdk): a health check registered after startup runs in /readyz, and registerHealthProbe returns a remover
Cherry-picked from #1135 (merged to release/1.11.x)
Original commit: 7f2f48f
Co-Authored-By: frontegg-david <69419539+frontegg-david@users.noreply.github.com>
* Cherry-pick: fix(sdk,plugins): a bundle swap sends one list_changed per list it changed, not one per entry
Cherry-picked from #1136 (merged to release/1.11.x)
Original commit: 0296291
Co-Authored-By: frontegg-david <69419539+frontegg-david@users.noreply.github.com>
* Cherry-pick: fix(adapters,plugins,edge): a restarted server serves its cached bundle in place of an older or refused pull, and doesn't write it back
Cherry-picked from #1137 (merged to release/1.11.x)
Original commit: 358d114
Co-Authored-By: frontegg-david <69419539+frontegg-david@users.noreply.github.com>
* Cherry-pick: fix(sdk,adapters,plugins,edge): a push token with a body_sha256 claim can't carry another bundle
Cherry-picked from #1138 (merged to release/1.11.x)
Original commit: b870325
Co-Authored-By: frontegg-david <69419539+frontegg-david@users.noreply.github.com>
* Cherry-pick: fix(plugins,edge): managed mode takes confirm, and the audit log says whether the user confirmed a call
Cherry-picked from #1139 (merged to release/1.11.x)
Original commit: 588289f
Co-Authored-By: frontegg-david <69419539+frontegg-david@users.noreply.github.com>
* Cherry-pick: fix(cli): the generated CLI says unknown command, prints an MCP error prefix once, and offers load_skill only the run lines it has
Cherry-picked from #1140 (merged to release/1.11.x)
Original commit: 4cfe9a2
Co-Authored-By: frontegg-david <69419539+frontegg-david@users.noreply.github.com>
* Cherry-pick: fix(plugins): load_skill's outputSchema describes a loaded skill once
Cherry-picked from #1141 (merged to release/1.11.x)
Original commit: 470010e
Co-Authored-By: frontegg-david <69419539+frontegg-david@users.noreply.github.com>
* Cherry-pick: fix(sdk,cli): skills/load's default answer sends formattedContent again, as 1.11.0 did; format: 'markdown' is the opt-in for the smaller one
Cherry-picked from #1142 (merged to release/1.11.x)
Original commit: a680fe7
Co-Authored-By: frontegg-david <69419539+frontegg-david@users.noreply.github.com>
---------
Co-authored-by: agentfront[bot] <agentfront[bot]@users.noreply.github.com>
Co-authored-by: frontegg-david <69419539+frontegg-david@users.noreply.github.com>
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What and why
The Skilled OpenAPI plugin takes signed bundles from a
saassource: pulled at startup, on each poll or on a Worker's Cron run, and pushed toPOST /__skilled_openapi/pushwithenableWebhook. It checked a bundle's push token, schema and signature, but never its version. So a validly signed older bundle was applied, kept as the last good bundle, and rolled the server back. Two ways to get there:Now a bundle from the
saassource, pulled or pushed, is applied only when it isn't older than the bundle being served.The ordering rule. A bundle's
versionis any string of 1 to 256 characters: the schema doesn't require semver,compileSkilledBundleFromOpenApi()takes it as given, and real bundles use1.0.0,7or2026.05.01-1. Every bundle has ageneratedAt, which the schema requires to be a parsable date and the signature covers. So:generatedAt.generatedAt.generatedAtis the same bundle: it applies as before, since every poll pulls the served bundle again.Refusing to order non-semver versions, and accepting only an exact match, would block every update of a bundle versioned
1,2, ... So the rule falls back togeneratedAtinstead.The same version with other content. A hotfix re-signed under the same version is plausible, so it applies when its
generatedAtis later. An earlier build of that version, as a replay would be, is refused.Where it runs.
SkillBundleSource.forwardOnly, true onSaasPullSourceunlessallowRollback. This matches how a source already declarespushandkeepBundle.BundleSyncService.apply()enforces it, as a third gate after the pin and signature gates. It runs inside the apply queue, so it compares with the bundle actually served, and pulls and pushes can't race it.409 for a push. The bundle itself is valid. It conflicts with the server's current state, the served version, so it answers
409 bundle_outdated, next to409 push_replayed.422 bundle_not_appliedstays for a bundle whose own content fails its checks. The separate error code tells the bundle server to send a newer version, not to fix the bundle.A deliberate rollback.
allowRollback: trueon thesaassource, validated by its Zod schema, applies an older bundle. It sits on the source, next toenableWebhookandpollIntervalMs, because only that source orders versions..optional(), not.default(false), so the exportedSaasSourceOptionstype stays compatible for code that builds aSaasPullSourceby hand.@frontmcp/edgepassesmanaged.allowRollbackthrough.What stays.
static,npmandinlinesources apply any bundle, as before. Their bundles come from the deployer's own files or code, so a watched file edited back to an older version is a deliberate edit.Scenarios covered: B2 (the
saaspull per poll, and the cache), B3 (a bundle that isn't applied leaves the served one), B6 and J2 (pushed bundles on a managed Cloudflare Worker).User-facing change
saasbundle older than the served one is not applied and not kept. The log says[bundle-sync] bundle <id>@<version> not applied: older than the served bundle <id>@<version> (generatedAt <date>).409 { "error": "bundle_outdated" }.allowRollbackon thesaassource, andmanaged.allowRollbackon@frontmcp/edge.compareBundleVersions()from@frontmcp/adapters/skills.forwardOnlyonSkillBundleSource, andrefusal?: 'outdated'onBundleApplyResult.acme:billing@1.4.0, pulled or pushed while1.5.0is served, was applied and replaced the cached bundle. Now it is refused,1.5.0keeps serving and stays cached, and a push answers 409. WithallowRollback: trueit applies, as before.frontmcp-deployment/references/deploy-to-cloudflare-skills-only.md(version order, rollback, the409 bundle_outdatedanswer).Tests
Added:
@frontmcp/adapters:compareBundleVersions: semver precedence, prereleases, the same version bygeneratedAt, build metadata, equal bundles, non-semver versions;allowRollbackschema;forwardOnlyon each source.@frontmcp/plugin-skilled-openapi, the sync service:outdated;generatedAt;allowRollback, and a source that doesn't order its bundles (static, inline), apply an older one;@frontmcp/plugin-skilled-openapi, a real server with asaassource (new integration spec):bundle_outdated;allowRollbackapplies an older pull and push;@frontmcp/edge:managed.allowRollbackis passed to the source.demo-e2e-skilled-openapi: a poll that serves an older signed version isn't applied, and the cache keeps the served one.demo-e2e-cloudflare: an older signed bundle pushed to the Worker answers 409, and KV keeps the served one.Run:
adaptersplugin-skilled-openapiedgeskillsdemo-e2e-skilled-openapidemo-e2e-skilled-openapi:test:pw(browser)demo-e2e-cloudflareadapters,plugin-skilled-openapi,edge,demo-e2e-skilled-openapi)adapters,plugin-skilled-openapi,edge)With the gate turned off, 3 of the 5 new integration tests fail, so they test the fix.
Summary by CodeRabbit
409 bundle_outdatedresponse while keeping the currently served bundle active.allowRollbackto permit older bundles. Bundle ordering uses semantic versions when both versions are valid and differ; otherwise, it uses the bundle generation time.