diff --git a/docs/compatibility.md b/docs/compatibility.md
index 6cf6cb7f..142ca390 100644
--- a/docs/compatibility.md
+++ b/docs/compatibility.md
@@ -682,7 +682,7 @@ Pre conditions use the status and action-scoped environment available when prepa
 
 ### Checkout action
 
-**🟡 Supported subset.** The final v1.2.0, v2.8.0, and v3.7.0 release commits are admitted exactly. Resolved commits in the v4-and-later range of the static [`actions/checkout` upstream `main` snapshot](https://github.com/actions/checkout/tree/f548e57e544e1ff5a4c46bf1e1b8685f8e4a348a) are also admitted. The following known releases remain admitted even when their commits aren't reachable from that snapshot:
+**🟡 Supported subset.** Immutable commits captured from frozen upstream tags, `main`, `master`, and `releases/v1` through `releases/v6` snapshots are admitted. The snapshot includes historical development and release commits across v1 through v7. These known releases identify the principal contracts:
 
 | Release | Commit |
 | --- | --- |
@@ -695,34 +695,38 @@ Pre conditions use the status and action-scoped environment available when prepa
 | v7.0.0 corpus pin | [`9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0`](https://github.com/actions/checkout/tree/9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0) |
 | v7.0.1 | [`3d3c42e5aac5ba805825da76410c181273ba90b1`](https://github.com/actions/checkout/tree/3d3c42e5aac5ba805825da76410c181273ba90b1) |
 
-Mutable refs work only while they resolve to the upstream `main` snapshot or a known release above. Every admitted commit uses the native adapter; the upstream JavaScript doesn't run. Each admitted release accepts only the inputs it declares, so earlier releases reject later inputs. Other pre-v3.7.0 commits and unknown commits are unsupported. Compilation emits `W_CHECKOUT_LEGACY_RELEASE` for v1.2.0 and v2.8.0 to nudge an upgrade to v4 or later. Maintainers can update the v4-and-later snapshot with `go generate ./internal/action/integration`; this doesn't widen release admission.
+Mutable refs work only while they resolve to a commit in the frozen snapshots. Every admitted commit uses the native adapter; the upstream JavaScript doesn't run. Each commit retains the inputs, full-history default, and outputs declared by its upstream contract. For example, early v2 commits reject later v2 inputs, and v4.0 and v4.1 commits don't expose the `ref` and `commit` outputs. Commits absent from the snapshots and manifests with unsupported output contracts remain unsupported. Compilation emits `W_CHECKOUT_LEGACY_RELEASE` for v1.2.0 and v2.8.0 to nudge an upgrade to v4 or later.
+
+Maintainers can refresh the frozen refs and per-commit profiles with `go generate ./internal/action/integration`. Regeneration admits only commits reachable from the selected upstream tags and branches at that time; it doesn't blanket-admit future commits.
 
 The adapter checks out a detached commit or static branch from the event repository at the workspace root or a clean top-level directory. It uses Buildkite repository-provider Git credentials when the job provides them; otherwise, it fetches anonymously. Credentials are scoped to each fetch command and verified submodule fetch command and are never persisted.
 
+An explicit input is accepted only when the snapshotted manifest for that commit declares it. The following value restrictions then apply:
+
 | Input | Supported values |
 | --- | --- |
 | `repository` | Omitted, or the event `owner/repo`. |
 | `ref` | Omitted, empty, a lowercase 40-hex commit, or a static branch in the event repository. A direct `github.sha` or `needs.<job>.outputs.<name>` expression must resolve at runtime to the exact event SHA. |
 | `token` | Omitted only. |
-| `ssh-key`, `ssh-known-hosts` | v2.8.0 and later: omitted or empty. v1.2.0: omitted. |
-| `ssh-strict` | v2.8.0 and later: omitted or `true`. v1.2.0: omitted. |
-| `ssh-user` | v4 and later: omitted or `git`. Earlier releases: omitted. |
-| `persist-credentials` | v2.8.0 and later: omitted or `false`. v1.2.0: omitted. |
+| `ssh-key`, `ssh-known-hosts` | When declared by the commit: omitted or empty. Otherwise omitted. |
+| `ssh-strict` | When declared by the commit: omitted or `true`. Otherwise omitted. |
+| `ssh-user` | When declared by the commit: omitted or `git`. Otherwise omitted. |
+| `persist-credentials` | When declared by the commit: omitted or `false`. Otherwise omitted. |
 | `path` | Omitted, empty, or one clean non-`.git` top-level workspace directory. |
 | `clean` | Omitted or `true`; the root workspace or selected path must be empty or absent. |
-| `filter` | v4 and later: omitted or empty. Earlier releases: omitted. |
-| `sparse-checkout` | v3.7.0 and later: omitted or empty. Earlier releases: omitted. |
-| `sparse-checkout-cone-mode` | v3.7.0 and later: omitted or `true`. Earlier releases: omitted. |
-| `fetch-depth` | Omitted or a nonnegative integer; `0` fetches full history. v1.2.0 fetches full history when omitted. |
-| `fetch-tags` | v3.7.0 and later: omitted, `true`, or `false`. Earlier releases: omitted. |
-| `show-progress` | v4 and later: omitted, `true`, or `false`. Earlier releases: omitted. |
+| `filter` | When declared by the commit: omitted or empty. Otherwise omitted. |
+| `sparse-checkout` | When declared by the commit: omitted or empty. Otherwise omitted. |
+| `sparse-checkout-cone-mode` | When declared by the commit: omitted or `true`. Otherwise omitted. |
+| `fetch-depth` | Omitted or a nonnegative integer; `0` fetches full history. Historical runner-plugin commits fetch full history when omitted. |
+| `fetch-tags` | When declared by the commit: omitted, `true`, or `false`. Otherwise omitted. |
+| `show-progress` | When declared by the commit: omitted, `true`, or `false`. Otherwise omitted. |
 | `lfs` | Omitted or `false`. |
 | `submodules` | Omitted, `false`, `true`, or `recursive`; whitespace is trimmed and casing is ignored. |
-| `set-safe-directory` | v2.8.0 and later: omitted or `true`. v1.2.0: omitted. |
-| `github-server-url` | v3.7.0 and later: omitted, empty, or `https://github.com`. Earlier releases: omitted. |
-| `allow-unsafe-pr-checkout` | v2.8.0 and later: omitted or `false`. v1.2.0: omitted. |
+| `set-safe-directory` | When declared by the commit: omitted or `true`. Otherwise omitted. |
+| `github-server-url` | When declared by the commit: omitted, empty, or `https://github.com`. Otherwise omitted. |
+| `allow-unsafe-pr-checkout` | When declared by the commit: omitted or `false`. Otherwise omitted. |
 
-The `ref` and `commit` outputs are unavailable for v1.2.0, v2.8.0, and v3.7.0. Upstream added them in v4.2.0.
+The `ref` and `commit` outputs are available only for commits whose action manifest declares them. Upstream added both outputs in v4.2.0.
 
 The `false` value and omission do not run submodule commands. The `true` value runs native Git for direct children, and `recursive` includes nested children. Relative URLs and `fetch-depth` follow native Git behavior. Public and private GitHub submodules are supported under the job's repository access; external HTTPS submodules are anonymous. `git@github.com:` URLs are rewritten to HTTPS. Other SSH and non-HTTPS transports are unsupported.
 
diff --git a/internal/action/integration/checkout.go b/internal/action/integration/checkout.go
index 42c1e09c..390a0a1c 100644
--- a/internal/action/integration/checkout.go
+++ b/internal/action/integration/checkout.go
@@ -1,4 +1,4 @@
-//go:generate ../../../scripts/update-checkout-main-commits
+//go:generate go run ./cmd/generate-checkout-profiles
 
 package integration
 
@@ -12,10 +12,8 @@ import (
 )
 
 const (
-	// CheckoutV1Commit through CheckoutV7Commit are the current audited release
-	// implementations. CheckoutV1Commit, CheckoutV2Commit, and CheckoutV3Commit
-	// are the final v1, v2, and v3 releases and are admitted exactly rather
-	// than extending the v4-and-later main-branch snapshot.
+	// CheckoutV1Commit through CheckoutV7Commit identify principal release
+	// contracts within the broader frozen upstream snapshots.
 	// CheckoutV7InitialCommit is retained because it is pinned by the OSS
 	// compatibility corpus; its later v7.0.1 changes do not affect the adapter's
 	// bounded exact-event-SHA operation.
@@ -40,47 +38,31 @@ var checkoutCommits = map[string]string{
 	CheckoutV7Commit:        "v7.0.1",
 }
 
-// checkoutInputIntroduced records the earliest admitted release generation
-// declaring each version-gated input. Inputs absent from this map are declared
-// by every admitted release.
-var checkoutInputIntroduced = map[string]int{
-	"ssh-key":                   2,
-	"ssh-known-hosts":           2,
-	"ssh-strict":                2,
-	"persist-credentials":       2,
-	"set-safe-directory":        2,
-	"allow-unsafe-pr-checkout":  2,
-	"fetch-tags":                3,
-	"sparse-checkout":           3,
-	"sparse-checkout-cone-mode": 3,
-	"github-server-url":         3,
-	"filter":                    4,
-	"show-progress":             4,
-	"ssh-user":                  4,
+// checkoutContract records the adapter-visible contract declared by one
+// immutable upstream action manifest.
+type checkoutContract struct {
+	// inputs is a sorted, comma-separated set of names declared by the
+	// immutable upstream action manifest.
+	inputs                  string
+	fullHistory             bool
+	refOutput, commitOutput bool
 }
 
-func checkoutGeneration(commit string) int {
-	switch commit {
-	case CheckoutV1Commit:
-		return 1
-	case CheckoutV2Commit:
-		return 2
-	case CheckoutV3Commit:
-		return 3
-	}
-	return 4
+func (c checkoutContract) declaresInput(name string) bool {
+	return strings.Contains(","+c.inputs+",", ","+name+",")
 }
 
 // CheckoutSupportsOutputs reports whether the admitted release declares the
 // ref and commit outputs, added upstream in v4.2.0.
 func CheckoutSupportsOutputs(commit string) bool {
-	return checkoutGeneration(commit) >= 4
+	contract, ok := checkoutCommitContracts[commit]
+	return ok && contract.refOutput && contract.commitOutput
 }
 
 // CheckoutDefaultsToFullHistory reports whether the admitted release fetched
 // full history when fetch-depth was omitted, as v1's runner plugin did.
 func CheckoutDefaultsToFullHistory(commit string) bool {
-	return commit == CheckoutV1Commit
+	return checkoutCommitContracts[commit].fullHistory
 }
 
 // LegacyCheckoutRelease reports the admitted release label for the v1 and v2
@@ -92,15 +74,12 @@ func LegacyCheckoutRelease(commit string) (string, bool) {
 	return "", false
 }
 
-// validateCheckoutCommit admits known releases and a static snapshot of
-// commits reachable from upstream main. Mutable references are resolved before
-// this check, so changes after the snapshot are rejected until regeneration.
+// validateCheckoutCommit admits commits with contracts captured from frozen
+// upstream release and main snapshots. Mutable references are resolved before
+// this check, so changes after the snapshots are rejected until regeneration.
 func validateCheckoutCommit(commit string) error {
-	if _, ok := checkoutCommits[commit]; ok {
-		return nil
-	}
-	if _, ok := checkoutMainCommits[commit]; !ok {
-		supported := append(sortedCheckoutCommits(), "upstream main snapshot ("+checkoutMainSnapshotCommit+")")
+	if _, ok := checkoutCommitContracts[commit]; !ok {
+		supported := append(sortedCheckoutCommits(), "frozen upstream release and main snapshots (main "+checkoutMainSnapshotCommit+")")
 		return versionError("actions/checkout", "native adapter", commit, supported)
 	}
 	return nil
@@ -118,9 +97,12 @@ func sortedCheckoutCommits() []string {
 // ValidateCheckoutInputs enforces the release-specific input contract
 // implemented by the tokenless event-repository checkout adapter.
 func ValidateCheckoutInputs(commit string, inputs map[string]string, repository, sha string) error {
+	contract, ok := checkoutCommitContracts[commit]
+	if !ok {
+		return versionError("actions/checkout", "native adapter", commit, append(sortedCheckoutCommits(), "frozen upstream release and main snapshots (main "+checkoutMainSnapshotCommit+")"))
+	}
 	names := sortedNames(inputs)
 	seen := make(map[string]bool, len(names))
-	generation := checkoutGeneration(commit)
 	for _, name := range names {
 		value := inputs[name]
 		normalized := strings.ToLower(name)
@@ -128,7 +110,7 @@ func ValidateCheckoutInputs(commit string, inputs map[string]string, repository,
 			return fmt.Errorf("duplicate case-insensitive input %q is unsupported", name)
 		}
 		seen[normalized] = true
-		if checkoutInputIntroduced[normalized] > generation {
+		if !contract.declaresInput(normalized) {
 			return fmt.Errorf("explicit input %q is unsupported by this actions/checkout release", name)
 		}
 		switch normalized {
diff --git a/internal/action/integration/checkout_main_commits_generated.go b/internal/action/integration/checkout_main_commits_generated.go
deleted file mode 100644
index 1bc0b016..00000000
--- a/internal/action/integration/checkout_main_commits_generated.go
+++ /dev/null
@@ -1,103 +0,0 @@
-// Code generated by scripts/update-checkout-main-commits; DO NOT EDIT.
-
-package integration
-
-const checkoutMainSnapshotCommit = "f548e57e544e1ff5a4c46bf1e1b8685f8e4a348a"
-
-var checkoutMainCommits = map[string]struct{}{
-	"009b9ae9e446ad8d9b8c809870b0fbcc5e03573e": {},
-	"033fa0dc0b82693d8986f1016a0ec2c5e7d9cbb1": {},
-	"064fe7f3312418007dea2b49a19844a9ee378f49": {},
-	"069c6959146423d11cd0184e6accf28f9d45f06e": {},
-	"08c6903cd8c0fde910a37f88322edcfb5dd907a8": {},
-	"08eba0b27e820071cde6df949e0beb9ba4906955": {},
-	"09d2acae674a48949e3602304ab46fd20ae0c42f": {},
-	"0ad4b8fadaa221de15dcec353f45205ec38ea70b": {},
-	"0c366fd6a839edf440554fa01a7085ccba70ac98": {},
-	"0f9f3aa320cb53abeb534aeb54048075d9697a0e": {},
-	"1044a6dea927916f2c38ba5aeffbc0a847b1221a": {},
-	"11bd71901bbe5b1630ceea73d27597364c9af683": {},
-	"12cd2235efa0937479335606d7c3ac9f6c0973b1": {},
-	"130a169078a413d3a5246a393625e8e742f387f6": {},
-	"163217dfcd28294438ea1c1c149cfaf66eec283e": {},
-	"1af3b93b6815bc44a9784bd300feb67ff0d1eeb3": {},
-	"1cce3390c2bfda521930d01229c073c7ff920824": {},
-	"1d96c772d19495a3b5c517cd2bc0cb401ea0529f": {},
-	"24ed1a352802348c9e4e8d13de9177fb95b537ba": {},
-	"2650dbd060003e3b5ae211e4358852f336b682a7": {},
-	"28802689a136bfcdb721715abd713740beecbe07": {},
-	"2d7d9f7ff5b310f983d059b68785b3c74d8b8edd": {},
-	"37b082107ba410260a3aaddf93122e04801ce631": {},
-	"3b9b8c884f6b4bb4d5be2779c26374abadae0871": {},
-	"3d3c42e5aac5ba805825da76410c181273ba90b1": {},
-	"3df4ab11eba7bda6032a0b82a6bb43b11571feac": {},
-	"3f603f6d5e9f40714f97b2f017aa0df2a443192a": {},
-	"43045ae669be728bd34ed56fcd1a230c0dc4d8e2": {},
-	"44c2b7a8a4ea60a981eaca3cf939b5f4305c123b": {},
-	"473055ba18d6d2da209cd46110aadb9275e3194e": {},
-	"4f1f4aec02e41874fa0262ea8ff5172d7978ad1e": {},
-	"537c7ef99cef6e5ddb5e7ff5d16d14510503801d": {},
-	"556e4c3cb0b8b54b734286d5439adadcb0a8cb92": {},
-	"5de26ee9b11f6ffa02406edecc0e750256af18b1": {},
-	"62661c4e71a304b2823ed026347b8d34c3eac541": {},
-	"631c7dc4f80f88219c5ee78fee08c6b62fac8da1": {},
-	"631c942040754b6e095e929c1677c07e10ed4f87": {},
-	"692973e3d937129bcbf40652eb9f2f61becf3332": {},
-	"6b42224f41ee5dfe5395e27c8b2746f1f9955030": {},
-	"6ccd57f4c5d15bdc2fef309bd9fb6cc9db2ef1c6": {},
-	"6d193bf28034eafb982f37bd894289fe649468fc": {},
-	"71cf2267d89c5cb81562390fa70a37fa40b1305e": {},
-	"72f2cec99f417b1a1c5e2e88945068983b7965f9": {},
-	"79102f25032f3f70eb9d8386b1451cf1ef55902d": {},
-	"7cdaf2fbc075e6f3b9ca94cfd6cec5adc8a75622": {},
-	"7d09575332117a40b46e5e020664df234cd416f3": {},
-	"8410ad0602e1e429cee44a835ae9f77f654a6694": {},
-	"8459bc0c7e3759cdf591f513d9f141a95fef0a8f": {},
-	"8530928916aaef40f59e6f221989ccb31f5759e7": {},
-	"85e6279cec87321a52edac9c87bce653a07cf6c2": {},
-	"8ade135a41bc03ea155e62e844d188df1ea18608": {},
-	"8b5e8b768746b50394015010d25e690bfab9dfbc": {},
-	"8e8c483db84b4bee98b60c0593521ed34d9990e8": {},
-	"8eb1f6a495037164bea451156472f35fdd6bafc0": {},
-	"8edcb1bdb4e267140fa742c62e395cd74f332709": {},
-	"900f2210b1d28bbbd0bd22d17926b9e224e8f231": {},
-	"97a652b80035363df47baee5031ec8670b8878ac": {},
-	"9839dc14a02ddc6b6995e69eb3ecb98132fc8b6b": {},
-	"9a9194f87191a7e9055e3e9b95b8cfb13023bb08": {},
-	"9b4c13b0bfa31b4514c14f74b5a166c2708f43c6": {},
-	"9bb56186c3b09b4f86b1c65136769dd318469633": {},
-	"9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0": {},
-	"9c1e94e0ad997d618b6113a2171b055037589028": {},
-	"9f265659d3bb64ab1440b03b12f4d47a24320917": {},
-	"a5ac7e51b41094c92402da3b24376905380afc29": {},
-	"aadec899646c8e0f34c52d9219c2faac36626b55": {},
-	"b17fe1e4d59a9d1d95a7aead5e6fcd13e50939a5": {},
-	"b1ec3021b8fa02164da82ca1557d017d83b0e179": {},
-	"b32f140b0c872d58512e0a66172253c302617b90": {},
-	"b4ffde65f46336ab88eb53be808477a3936bae11": {},
-	"b6849436894e144dbce29d7d7fda2ae3bf9d8365": {},
-	"b80ff79f1755d06ba70441c368a6fe801f5f3a62": {},
-	"b9e0990d219a03df7633c93f6f005a8fecbcab22": {},
-	"ba097532fb203f7e88c9c3c0b899b49469908a92": {},
-	"c2d88d3ecc89a9ef08eebf45d9637801dcee7eb5": {},
-	"c533a0a4cfc4962971818edcfac47a2899e69799": {},
-	"cbb722410c2e876e24abbe8de2cc27693e501dcb": {},
-	"cd7d8d697e10461458bc61a30d094dc601a8b017": {},
-	"d632683dd7b4114ad314bca15554477dd762a938": {},
-	"d914b262ffc244530a203ab40decab34c3abf34d": {},
-	"db0cee9a514becbbd4a101a5fbbbf47865ee316c": {},
-	"dd960bd3c3f080561a1810e32349ac211ecec7d4": {},
-	"de0fac2e4500dabe0009e67214ff5f5447ce83dd": {},
-	"de5a000abf73b6f4965bd1bcdf8f8d94a56ea815": {},
-	"df0bcddf6d6823307c716b56a7ef9c3b25078874": {},
-	"df4cb1c069e1874edd31b4311f1884172cec0e10": {},
-	"e3d2460bbb42d7710191569f88069044cfb9d8cf": {},
-	"e8cb398be4a550817e382abf69e4c12c76fce1f2": {},
-	"e8d4307400f9427dba7cb98e488d6ab85f1cec5f": {},
-	"eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871": {},
-	"f0282184c7ce73ab54c7e4ab5a617122602e575f": {},
-	"f548e57e544e1ff5a4c46bf1e1b8685f8e4a348a": {},
-	"f9e715a95fcd1f9253f77dd28f11e88d2d6460c7": {},
-	"fd084cde189b7b76ec305d52e27be545a0172823": {},
-	"ff7abcd0c3c05ccf6adc123a8cd1fd4fb30fb493": {},
-}
diff --git a/internal/action/integration/checkout_profiles_generated.go b/internal/action/integration/checkout_profiles_generated.go
new file mode 100644
index 00000000..d00598f8
--- /dev/null
+++ b/internal/action/integration/checkout_profiles_generated.go
@@ -0,0 +1,292 @@
+// Code generated by internal/action/integration/cmd/generate-checkout-profiles; DO NOT EDIT.
+
+package integration
+
+const checkoutMainSnapshotCommit = "f548e57e544e1ff5a4c46bf1e1b8685f8e4a348a"
+
+var checkoutSnapshotTips = map[string]string{
+	"main":        "f548e57e544e1ff5a4c46bf1e1b8685f8e4a348a",
+	"master":      "61b9e3751b92087fd0b06925ba6dd6314e06f089",
+	"releases/v1": "0b496e91ec7ae4428c3ed2eeb4c3a40df431f2cc",
+	"releases/v2": "0717577d45739eb3c851188b29f50ed6c0b2194e",
+	"releases/v3": "a37ce9120846195fa4ece8f58b268e6043cb2f26",
+	"releases/v4": "11d5960a326750d5838078e36cf38b85af677262",
+	"releases/v5": "fbc6f3992d24b796d5a048ff273f7fcc4a7b6c09",
+	"releases/v6": "d23441a48e516b6c34aea4fa41551a30e30af803",
+}
+
+var (
+	checkoutProfile01 = checkoutContract{inputs: "allow-unsafe-pr-checkout,clean,fetch-depth,fetch-tags,filter,github-server-url,lfs,path,persist-credentials,ref,repository,set-safe-directory,show-progress,sparse-checkout,sparse-checkout-cone-mode,ssh-key,ssh-known-hosts,ssh-strict,ssh-user,submodules,token", fullHistory: false, refOutput: true, commitOutput: true}
+	checkoutProfile02 = checkoutContract{inputs: "allow-unsafe-pr-checkout,clean,fetch-depth,fetch-tags,github-server-url,lfs,path,persist-credentials,ref,repository,set-safe-directory,sparse-checkout,sparse-checkout-cone-mode,ssh-key,ssh-known-hosts,ssh-strict,submodules,token", fullHistory: false, refOutput: false, commitOutput: false}
+	checkoutProfile03 = checkoutContract{inputs: "allow-unsafe-pr-checkout,clean,fetch-depth,lfs,path,persist-credentials,ref,repository,set-safe-directory,ssh-key,ssh-known-hosts,ssh-strict,submodules,token", fullHistory: false, refOutput: false, commitOutput: false}
+	checkoutProfile04 = checkoutContract{inputs: "clean,fetch-depth,fetch-tags,filter,github-server-url,lfs,path,persist-credentials,ref,repository,set-safe-directory,show-progress,sparse-checkout,sparse-checkout-cone-mode,ssh-key,ssh-known-hosts,ssh-strict,ssh-user,submodules,token", fullHistory: false, refOutput: false, commitOutput: false}
+	checkoutProfile05 = checkoutContract{inputs: "clean,fetch-depth,fetch-tags,filter,github-server-url,lfs,path,persist-credentials,ref,repository,set-safe-directory,show-progress,sparse-checkout,sparse-checkout-cone-mode,ssh-key,ssh-known-hosts,ssh-strict,ssh-user,submodules,token", fullHistory: false, refOutput: true, commitOutput: true}
+	checkoutProfile06 = checkoutContract{inputs: "clean,fetch-depth,fetch-tags,filter,github-server-url,lfs,path,persist-credentials,ref,repository,set-safe-directory,show-progress,sparse-checkout,sparse-checkout-cone-mode,ssh-key,ssh-known-hosts,ssh-strict,submodules,token", fullHistory: false, refOutput: false, commitOutput: false}
+	checkoutProfile07 = checkoutContract{inputs: "clean,fetch-depth,fetch-tags,github-server-url,lfs,path,persist-credentials,ref,repository,set-safe-directory,show-progress,sparse-checkout,sparse-checkout-cone-mode,ssh-key,ssh-known-hosts,ssh-strict,submodules,token", fullHistory: false, refOutput: false, commitOutput: false}
+	checkoutProfile08 = checkoutContract{inputs: "clean,fetch-depth,fetch-tags,github-server-url,lfs,path,persist-credentials,ref,repository,set-safe-directory,sparse-checkout,sparse-checkout-cone-mode,ssh-key,ssh-known-hosts,ssh-strict,submodules,token", fullHistory: false, refOutput: false, commitOutput: false}
+	checkoutProfile09 = checkoutContract{inputs: "clean,fetch-depth,github-server-url,lfs,path,persist-credentials,ref,repository,set-safe-directory,sparse-checkout,sparse-checkout-cone-mode,ssh-key,ssh-known-hosts,ssh-strict,submodules,token", fullHistory: false, refOutput: false, commitOutput: false}
+	checkoutProfile10 = checkoutContract{inputs: "clean,fetch-depth,github-server-url,lfs,path,persist-credentials,ref,repository,set-safe-directory,ssh-key,ssh-known-hosts,ssh-strict,submodules,token", fullHistory: false, refOutput: false, commitOutput: false}
+	checkoutProfile11 = checkoutContract{inputs: "clean,fetch-depth,lfs,path,persist-credentials,ref,repository,set-safe-directory,ssh-key,ssh-known-hosts,ssh-strict,submodules,token", fullHistory: false, refOutput: false, commitOutput: false}
+	checkoutProfile12 = checkoutContract{inputs: "clean,fetch-depth,lfs,path,persist-credentials,ref,repository,ssh-key,ssh-known-hosts,ssh-strict,submodules,token", fullHistory: false, refOutput: false, commitOutput: false}
+	checkoutProfile13 = checkoutContract{inputs: "clean,fetch-depth,lfs,path,persist-credentials,ref,repository,submodules,token", fullHistory: false, refOutput: false, commitOutput: false}
+	checkoutProfile14 = checkoutContract{inputs: "clean,fetch-depth,lfs,path,persist-credentials,ref,repository,token", fullHistory: false, refOutput: false, commitOutput: false}
+	checkoutProfile15 = checkoutContract{inputs: "clean,fetch-depth,lfs,path,ref,repository,submodules,token", fullHistory: true, refOutput: false, commitOutput: false}
+	checkoutProfile16 = checkoutContract{inputs: "clean,fetch-depth,lfs,path,ref,repository,token", fullHistory: false, refOutput: false, commitOutput: false}
+)
+
+var checkoutCommitContracts = map[string]checkoutContract{
+	"009b9ae9e446ad8d9b8c809870b0fbcc5e03573e": checkoutProfile05,
+	"00a3be89340a3ce8d704f82f44a5e7f9e3a84dfe": checkoutProfile12,
+	"01a434328acfaec94cbfc1cd07b3373e4693d132": checkoutProfile16,
+	"01aecccf739ca6ff86c0539fbc67a7a5007bbc81": checkoutProfile12,
+	"0299a0d2b67d48224ce047d03c69693b37fe77fe": checkoutProfile12,
+	"033fa0dc0b82693d8986f1016a0ec2c5e7d9cbb1": checkoutProfile05,
+	"06218e4404b044c23590a921fa858fb632a41afe": checkoutProfile14,
+	"064fe7f3312418007dea2b49a19844a9ee378f49": checkoutProfile05,
+	"069c6959146423d11cd0184e6accf28f9d45f06e": checkoutProfile05,
+	"0717577d45739eb3c851188b29f50ed6c0b2194e": checkoutProfile03,
+	"08c6903cd8c0fde910a37f88322edcfb5dd907a8": checkoutProfile05,
+	"08eba0b27e820071cde6df949e0beb9ba4906955": checkoutProfile05,
+	"090d9c9dfda6bb13508d978c6be93801de84f967": checkoutProfile14,
+	"0963d3b35f4826b619c2436e1bdce37c147daeaf": checkoutProfile15,
+	"096e9277500008410ac4dd98a7bb0d9052330de8": checkoutProfile14,
+	"09d2acae674a48949e3602304ab46fd20ae0c42f": checkoutProfile05,
+	"0ad4b8fadaa221de15dcec353f45205ec38ea70b": checkoutProfile04,
+	"0b496e91ec7ae4428c3ed2eeb4c3a40df431f2cc": checkoutProfile15,
+	"0c366fd6a839edf440554fa01a7085ccba70ac98": checkoutProfile05,
+	"0f9f3aa320cb53abeb534aeb54048075d9697a0e": checkoutProfile01,
+	"0ffe6f9c5599e73776da5b7f113e994bc0a76ede": checkoutProfile11,
+	"1044a6dea927916f2c38ba5aeffbc0a847b1221a": checkoutProfile01,
+	"11bd71901bbe5b1630ceea73d27597364c9af683": checkoutProfile05,
+	"11d5960a326750d5838078e36cf38b85af677262": checkoutProfile01,
+	"12cd2235efa0937479335606d7c3ac9f6c0973b1": checkoutProfile01,
+	"130a169078a413d3a5246a393625e8e742f387f6": checkoutProfile01,
+	"1433f62caac9c18949f9a498f6f28c05388ea443": checkoutProfile12,
+	"163217dfcd28294438ea1c1c149cfaf66eec283e": checkoutProfile05,
+	"1af3b93b6815bc44a9784bd300feb67ff0d1eeb3": checkoutProfile05,
+	"1cce3390c2bfda521930d01229c073c7ff920824": checkoutProfile05,
+	"1d96c772d19495a3b5c517cd2bc0cb401ea0529f": checkoutProfile04,
+	"1e204e9a9253d643386038d443f96446fa156a97": checkoutProfile12,
+	"1e31de5234b9f8995739874a8ce0492dc87873e2": checkoutProfile07,
+	"1f9a0c22da41e6ebfa534300ef656657ea2c6707": checkoutProfile10,
+	"2036a08e25fa78bbd946711a407b529a0a1204bf": checkoutProfile12,
+	"204620207c9669dc859681b83d09302c7deb97ce": checkoutProfile14,
+	"21dc310f1948a06cc989491cb1b4a86777f22918": checkoutProfile12,
+	"230611dbd0eb52da1e1f4f7bc8bb0c3a339fc8b7": checkoutProfile12,
+	"24cb9080177205b6e8c946b17badbe402adc938f": checkoutProfile10,
+	"24ed1a352802348c9e4e8d13de9177fb95b537ba": checkoutProfile04,
+	"2541b1294d2704b0964813337f33b291d3f8596b": checkoutProfile11,
+	"25a956c84d5dd820d28caab9f86b8d183aeeff3d": checkoutProfile12,
+	"262cdb5f1c2e469ea6a6810758c890b43e82bd2c": checkoutProfile03,
+	"2650dbd060003e3b5ae211e4358852f336b682a7": checkoutProfile06,
+	"26d48e8ea150211a9bc3b1f0c20448599687d926": checkoutProfile10,
+	"27135e314dd1818f797af1db9dae03a9f045786b": checkoutProfile10,
+	"28802689a136bfcdb721715abd713740beecbe07": checkoutProfile01,
+	"28c7f3d2b5162b5ddd3dfd9a45aa55eaf396478b": checkoutProfile12,
+	"299dd5064ede81803aeb1ce63fee4e150d9ae5f1": checkoutProfile14,
+	"2bd2911be9963da3ff84b7b09a28872059aa0564": checkoutProfile12,
+	"2d1c1198e79c30cca5c3957b1e3b65ce95b5356e": checkoutProfile12,
+	"2d7d9f7ff5b310f983d059b68785b3c74d8b8edd": checkoutProfile04,
+	"2ff2fbdea48a8f5da77a31e7dd5ecb46c017ffc3": checkoutProfile12,
+	"34e114876b0b11c390a56381ad16ebd13914f8d5": checkoutProfile05,
+	"3537747199ad29df25693bc607e99df5d7726ffd": checkoutProfile14,
+	"37b082107ba410260a3aaddf93122e04801ce631": checkoutProfile04,
+	"3b9b8c884f6b4bb4d5be2779c26374abadae0871": checkoutProfile05,
+	"3ba5ee6fac7e0e30e2ea884e236f282d3a775891": checkoutProfile10,
+	"3d3c42e5aac5ba805825da76410c181273ba90b1": checkoutProfile01,
+	"3d677ac575eac4b370e52131024fa99ee754def1": checkoutProfile12,
+	"3df4ab11eba7bda6032a0b82a6bb43b11571feac": checkoutProfile07,
+	"3df79e0276f4013ea6ed57534f3478cd2b1ef8c0": checkoutProfile15,
+	"3f603f6d5e9f40714f97b2f017aa0df2a443192a": checkoutProfile04,
+	"3fc17f8645e9648158a6d23b033ab5f62df29f3c": checkoutProfile12,
+	"40a16ebeed7da831425b665e600750cb36b38d06": checkoutProfile10,
+	"422dc4567157f4d62b665a8a288310365b1d194b": checkoutProfile13,
+	"43045ae669be728bd34ed56fcd1a230c0dc4d8e2": checkoutProfile04,
+	"442567ba5761652b13c5c842a2f959ac9da6be57": checkoutProfile12,
+	"44c2b7a8a4ea60a981eaca3cf939b5f4305c123b": checkoutProfile04,
+	"453ee27fca95fa9e03a24c1969a92c82e1a9b15e": checkoutProfile12,
+	"473055ba18d6d2da209cd46110aadb9275e3194e": checkoutProfile06,
+	"47fbe2df0ad0e27efb67a70beac3555f192b062f": checkoutProfile10,
+	"4817b449b0ed7c775a0bcecaa398041ab5d09b51": checkoutProfile16,
+	"4f1f4aec02e41874fa0262ea8ff5172d7978ad1e": checkoutProfile01,
+	"50fbc622fc4ef5163becd7fab6573eac35f8462e": checkoutProfile15,
+	"5126516654c75f76bca1de45dd82a3006d8890f9": checkoutProfile12,
+	"537c7ef99cef6e5ddb5e7ff5d16d14510503801d": checkoutProfile01,
+	"53bed0742eb3f0455187c7c7042d27f51b856f02": checkoutProfile15,
+	"556e4c3cb0b8b54b734286d5439adadcb0a8cb92": checkoutProfile06,
+	"56c00a7b1f53d3094df328ad4c2cd2b2d385c569": checkoutProfile12,
+	"574281d34cf49767d4b75b691c4c4f4655e0c93f": checkoutProfile12,
+	"58070a9fc3a91197fc9cbf24841ea31a2ab19980": checkoutProfile12,
+	"58246fdaeb114bc8d7e5ba1c0dd4504aa481f1c6": checkoutProfile02,
+	"5881116d181dc80f3ed5f395296a5579ee6fc6a4": checkoutProfile16,
+	"592cf69a223b04e75ddf345919130b91010eb2a6": checkoutProfile12,
+	"5a4ac9002d0be2fb38bd78e4b4dbde5606d7042f": checkoutProfile12,
+	"5c3ccc22eb2c950a0fa5bc7c47190d8e3f7e681a": checkoutProfile10,
+	"5de26ee9b11f6ffa02406edecc0e750256af18b1": checkoutProfile01,
+	"6026fb2ad3aa556d78b517cf65c8c1f832075860": checkoutProfile01,
+	"61b9e3751b92087fd0b06925ba6dd6314e06f089": checkoutProfile12,
+	"61fd8fd0c7a28ab9f73c23c595edbd0550bf0e78": checkoutProfile14,
+	"62661c4e71a304b2823ed026347b8d34c3eac541": checkoutProfile01,
+	"631c7dc4f80f88219c5ee78fee08c6b62fac8da1": checkoutProfile05,
+	"631c942040754b6e095e929c1677c07e10ed4f87": checkoutProfile01,
+	"65865e15a14a3de9378a18a026ce6548b17a39ed": checkoutProfile12,
+	"689bf84be4a745196a5c809a6afb12708ee43c3c": checkoutProfile16,
+	"692973e3d937129bcbf40652eb9f2f61becf3332": checkoutProfile04,
+	"6a84743051be17cee477b0a26bd866b5dba996e4": checkoutProfile10,
+	"6b42224f41ee5dfe5395e27c8b2746f1f9955030": checkoutProfile05,
+	"6ccd57f4c5d15bdc2fef309bd9fb6cc9db2ef1c6": checkoutProfile04,
+	"6d193bf28034eafb982f37bd894289fe649468fc": checkoutProfile05,
+	"6e6328ef28ba9c951379a07c83913e2acc8bc9a0": checkoutProfile15,
+	"71cf2267d89c5cb81562390fa70a37fa40b1305e": checkoutProfile05,
+	"722adc63f1aa60a57ec37892e133b1d319cae598": checkoutProfile14,
+	"72f2cec99f417b1a1c5e2e88945068983b7965f9": checkoutProfile07,
+	"7523e237893f02412c876c5511929ce0c74c348d": checkoutProfile12,
+	"755da8c3cf115ac066823e79a1e1788f8940201b": checkoutProfile10,
+	"7739b9ba2efcda9dde65ad1e3c2dbe65b41dfba7": checkoutProfile08,
+	"77904fd4316d60fc138fe2b8286ca220f763853e": checkoutProfile14,
+	"7884fcad6b5d53d10323aee724dc68d8b9096a2e": checkoutProfile11,
+	"79102f25032f3f70eb9d8386b1451cf1ef55902d": checkoutProfile01,
+	"7990b10a0ca6be1ddd27e4d84e6dbbe788d86662": checkoutProfile16,
+	"7b187184d12a8f064f797aeb51e4873c109637c7": checkoutProfile10,
+	"7cdaf2fbc075e6f3b9ca94cfd6cec5adc8a75622": checkoutProfile06,
+	"7d09575332117a40b46e5e020664df234cd416f3": checkoutProfile01,
+	"7f00b66d06eed909da8e56729955e53d186d95ed": checkoutProfile12,
+	"7f0669ca1fd955c0e0fd85ee8d5b8d16978be97e": checkoutProfile15,
+	"80602fafba6e982172195b721791020f4f17a227": checkoutProfile13,
+	"8230315d06ad95c617244d2f265d237a1682d445": checkoutProfile10,
+	"826ba42d6c06e4d78b1b33478af7b54277e60b52": checkoutProfile12,
+	"83b7061638ee4956cf7545a6f7efe594e5ad0247": checkoutProfile10,
+	"8410ad0602e1e429cee44a835ae9f77f654a6694": checkoutProfile06,
+	"8459bc0c7e3759cdf591f513d9f141a95fef0a8f": checkoutProfile04,
+	"8461dbfed36a8af202384a5b1ee0f7f1bf947821": checkoutProfile16,
+	"8530928916aaef40f59e6f221989ccb31f5759e7": checkoutProfile06,
+	"85b1f35505da871133b65f059e96210c65650a8b": checkoutProfile12,
+	"85e47d1a2bef5be8023f6dce02e0e8451938924f": checkoutProfile12,
+	"85e6279cec87321a52edac9c87bce653a07cf6c2": checkoutProfile05,
+	"86f86b36ef15e6570752e7175f451a512eac206b": checkoutProfile12,
+	"885641592076c27bfb56c028cd5612cdad63e16d": checkoutProfile10,
+	"8ade135a41bc03ea155e62e844d188df1ea18608": checkoutProfile06,
+	"8b5e8b768746b50394015010d25e690bfab9dfbc": checkoutProfile07,
+	"8e5e7e5ab8b370d6c329ec480221332ada57f0ab": checkoutProfile10,
+	"8e8c483db84b4bee98b60c0593521ed34d9990e8": checkoutProfile05,
+	"8eb1f6a495037164bea451156472f35fdd6bafc0": checkoutProfile06,
+	"8edcb1bdb4e267140fa742c62e395cd74f332709": checkoutProfile05,
+	"8f4b7f84864484a7bf31766abe9204da3cbe65b3": checkoutProfile10,
+	"8f9e05e482293f862823fcca12d9eddfb3723131": checkoutProfile12,
+	"900f2210b1d28bbbd0bd22d17926b9e224e8f231": checkoutProfile05,
+	"93cb6efe18208431cddfb8368fd83d5badbf9bfd": checkoutProfile05,
+	"93ea575cb5d8a053eaa0ac8fa3b40d7e05a33cc8": checkoutProfile10,
+	"94c2de77cccf605d74201a8aec6dd8fc0717ad66": checkoutProfile12,
+	"94d077c24971944d312dd9197c1bdfba62b39878": checkoutProfile15,
+	"96f53100ba2a5449eb71d2e6604bbcd94b9449b5": checkoutProfile09,
+	"97a652b80035363df47baee5031ec8670b8878ac": checkoutProfile08,
+	"97b30c411cc8e273e8f90d632b8e53d2604a90ca": checkoutProfile12,
+	"9839dc14a02ddc6b6995e69eb3ecb98132fc8b6b": checkoutProfile04,
+	"9a3a9ade8222dcdf9d3c77710b10df47ee7c7c89": checkoutProfile12,
+	"9a9194f87191a7e9055e3e9b95b8cfb13023bb08": checkoutProfile04,
+	"9b4c13b0bfa31b4514c14f74b5a166c2708f43c6": checkoutProfile04,
+	"9bb56186c3b09b4f86b1c65136769dd318469633": checkoutProfile06,
+	"9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0": checkoutProfile01,
+	"9c1e94e0ad997d618b6113a2171b055037589028": checkoutProfile04,
+	"9f265659d3bb64ab1440b03b12f4d47a24320917": checkoutProfile05,
+	"a12a3943b4bdde767164f792f33f40b04645d846": checkoutProfile12,
+	"a14471d838f6a7ce15cab8740f25e337c51e7cad": checkoutProfile15,
+	"a37ce9120846195fa4ece8f58b268e6043cb2f26": checkoutProfile02,
+	"a4b69b48862e969425d8dc115dcb965f288ea29b": checkoutProfile12,
+	"a572f640b07e96fc5837b3adfa0e5a2ddd8dae21": checkoutProfile16,
+	"a5ac7e51b41094c92402da3b24376905380afc29": checkoutProfile04,
+	"a6747255bd19d7a757dbdda8c654a9f84db19839": checkoutProfile14,
+	"a81bbbf8298c0fa03ea29cdc473d45769f953675": checkoutProfile12,
+	"aabbfeb2ce60b5bd82389903509092c4648a9713": checkoutProfile12,
+	"aadec899646c8e0f34c52d9219c2faac36626b55": checkoutProfile06,
+	"ac455590d1debd05854e62f352cf7a59e27328bc": checkoutProfile12,
+	"ac593985615ec2ede58e132d2e21d2b1cbd6127c": checkoutProfile10,
+	"add3486cc3b55d4a5e11c8045058cef96538edc7": checkoutProfile12,
+	"ae525b22625099736a2909d0eb22ec50cbe398fc": checkoutProfile14,
+	"af513c7a016048ae468971c52ed77d9562c7c819": checkoutProfile15,
+	"afe4af09a72596f47d806ee5f8b2674ec07fdc73": checkoutProfile12,
+	"b17fe1e4d59a9d1d95a7aead5e6fcd13e50939a5": checkoutProfile04,
+	"b1ec3021b8fa02164da82ca1557d017d83b0e179": checkoutProfile04,
+	"b2e6b7ed13bcde9d37c9e3e6967cd3ecfd2807ad": checkoutProfile12,
+	"b2eb13baee0ef6ef21737c8cf4a6a32f4e002442": checkoutProfile11,
+	"b32f140b0c872d58512e0a66172253c302617b90": checkoutProfile06,
+	"b4483adec309c0d01a5435c5e24eb40de5773ad9": checkoutProfile12,
+	"b4626ce19ce1106186ddf9bb20e706842f11a7c3": checkoutProfile13,
+	"b4b537b06a577732e04b29acc7294f645c135da0": checkoutProfile15,
+	"b4ffde65f46336ab88eb53be808477a3936bae11": checkoutProfile06,
+	"b6849436894e144dbce29d7d7fda2ae3bf9d8365": checkoutProfile05,
+	"b80ff79f1755d06ba70441c368a6fe801f5f3a62": checkoutProfile04,
+	"b9e0990d219a03df7633c93f6f005a8fecbcab22": checkoutProfile01,
+	"ba097532fb203f7e88c9c3c0b899b49469908a92": checkoutProfile01,
+	"bc50a995b88ec9334cb2f3b1c49502d9834ed2c5": checkoutProfile14,
+	"be0f44845645e415725af198163a96fea9e54334": checkoutProfile12,
+	"be6c44d969b1b004a9e0f7853e9cc9977ea0f7f0": checkoutProfile12,
+	"bf085276cecdb0cc76fbbe0687a5a0e786646936": checkoutProfile10,
+	"bf4af63534d79cb0712d8c86d8f2404844fa5a79": checkoutProfile15,
+	"c170eefc2657d93cc91397be50a299bff978a052": checkoutProfile14,
+	"c2d88d3ecc89a9ef08eebf45d9637801dcee7eb5": checkoutProfile05,
+	"c49af7ca1f339b07a5baac8c8bfc49a5248f31d3": checkoutProfile12,
+	"c533a0a4cfc4962971818edcfac47a2899e69799": checkoutProfile06,
+	"c85684db76ba6ef08713c10cf4befe3318887415": checkoutProfile14,
+	"c85c95e3d7251135ab7dc9ce3241c5835cc595a9": checkoutProfile09,
+	"c915c33a16f01166c17c4e35fe1d4085a2d71adb": checkoutProfile01,
+	"c952173edf28a2bd22e1a4926590c1ac39630461": checkoutProfile12,
+	"cab31617d857bf9e70dc35fd9e4dafe350794082": checkoutProfile16,
+	"cacfc4155de4db33162bcb6c82700751fda6bd91": checkoutProfile15,
+	"cbb722410c2e876e24abbe8de2cc27693e501dcb": checkoutProfile05,
+	"cc70598ce853d5d678b2440190cb18368e5cee8c": checkoutProfile16,
+	"cd6a9fd49371476d813e892956e2e920fcc3fb7e": checkoutProfile10,
+	"cd7d8d697e10461458bc61a30d094dc601a8b017": checkoutProfile06,
+	"d106d4669b3bfcb17f11f83f98e1cab478e9f635": checkoutProfile09,
+	"d23441a48e516b6c34aea4fa41551a30e30af803": checkoutProfile01,
+	"d50f8ea76748df49594d9b109b614f3b4db63c71": checkoutProfile12,
+	"d632683dd7b4114ad314bca15554477dd762a938": checkoutProfile05,
+	"d914b262ffc244530a203ab40decab34c3abf34d": checkoutProfile01,
+	"dac8cc78a1c612c854c383833b39e5a3f357b1f5": checkoutProfile12,
+	"db0cee9a514becbbd4a101a5fbbbf47865ee316c": checkoutProfile05,
+	"db41740e12847bb616a339b75eb9414e711417df": checkoutProfile14,
+	"dc323e67f16fb5f7663d20ff7941f27f5809e9b6": checkoutProfile11,
+	"dcd71f646680f2efd8db4afa5ad64fdcba30e748": checkoutProfile12,
+	"dd960bd3c3f080561a1810e32349ac211ecec7d4": checkoutProfile04,
+	"de0fac2e4500dabe0009e67214ff5f5447ce83dd": checkoutProfile05,
+	"de5a000abf73b6f4965bd1bcdf8f8d94a56ea815": checkoutProfile05,
+	"df0bcddf6d6823307c716b56a7ef9c3b25078874": checkoutProfile06,
+	"df4cb1c069e1874edd31b4311f1884172cec0e10": checkoutProfile05,
+	"df86c829ebbc4e80aa9885a4762d84e11e0eeacb": checkoutProfile12,
+	"dfd70d4a2dece5f4a1af8dc99e1508a16e916b60": checkoutProfile14,
+	"e2f20e631ae6d7dd3b768f56a5d2af784dd54791": checkoutProfile11,
+	"e347bba93bdcadab0b55e4b333254f9bb40bdb0c": checkoutProfile16,
+	"e3bc06d98631ce7e0e3db6bd158fafe028709e9f": checkoutProfile12,
+	"e3d2460bbb42d7710191569f88069044cfb9d8cf": checkoutProfile05,
+	"e52d022eb52c224e5f2201beb687a66849e3b200": checkoutProfile12,
+	"e6d535c99c374d0c3f6d8cd8086a57b43c6c700a": checkoutProfile10,
+	"e8bd1dffb6451bb0d84dbcd3ed059daca1371180": checkoutProfile15,
+	"e8cb398be4a550817e382abf69e4c12c76fce1f2": checkoutProfile01,
+	"e8d4307400f9427dba7cb98e488d6ab85f1cec5f": checkoutProfile01,
+	"eb35239ec22e9029a5be28f8c41e67452f615f0f": checkoutProfile10,
+	"eb8a193c1dbf4bbb2053320cef52bacc1a485839": checkoutProfile12,
+	"ec3a7ce113134d7a93b817d10a8272cb61118579": checkoutProfile12,
+	"eccf386318b560bdd401913a9fe3cca56dc369d6": checkoutProfile12,
+	"ee0669bd1cc54295c223e0bb666b733df41de1c5": checkoutProfile11,
+	"eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871": checkoutProfile05,
+	"f0282184c7ce73ab54c7e4ab5a617122602e575f": checkoutProfile01,
+	"f095bcc56b7c2baf48f3ac70d6d6782f4f553222": checkoutProfile10,
+	"f2190623701cfebaaf26554b39e1e29cc4a1f2fb": checkoutProfile14,
+	"f25a3a9f25bd5f4c5d77189cab02ff357b5aedeb": checkoutProfile12,
+	"f43a0e5ff2bd294095638e18286ca9a3d1956744": checkoutProfile08,
+	"f466b96953a8e78166c9b97a44a70220f1a3e77e": checkoutProfile14,
+	"f548e57e544e1ff5a4c46bf1e1b8685f8e4a348a": checkoutProfile01,
+	"f67ee5d6224ccd5af1909d53ea1faa5efb91db29": checkoutProfile11,
+	"f6ce2afa7079cb075a124c93c79d61779d845782": checkoutProfile15,
+	"f858c22e963bc60bc9d01c3d105c52a45a7deb6e": checkoutProfile14,
+	"f90c7b395dac7c5a277c1a6d93d5057c1cddb74e": checkoutProfile14,
+	"f93ca50bde35f63a65c67fc94cc8821ead20e631": checkoutProfile01,
+	"f95f2a38561736d1542cb9fbf736eea3d00ab5a6": checkoutProfile14,
+	"f9e715a95fcd1f9253f77dd28f11e88d2d6460c7": checkoutProfile01,
+	"fb6f360df236bd2026c7963cf88c8ddf20b4f0e2": checkoutProfile12,
+	"fbb30c60ab3f94a2c03755a7fb875120c137bef7": checkoutProfile12,
+	"fbc6f3992d24b796d5a048ff273f7fcc4a7b6c09": checkoutProfile01,
+	"fd084cde189b7b76ec305d52e27be545a0172823": checkoutProfile04,
+	"fd47087372161c6f2a7b96d2ef87e944d89023ed": checkoutProfile12,
+	"ff7abcd0c3c05ccf6adc123a8cd1fd4fb30fb493": checkoutProfile05,
+}
diff --git a/internal/action/integration/checkout_test.go b/internal/action/integration/checkout_test.go
index c4a21700..006faf88 100644
--- a/internal/action/integration/checkout_test.go
+++ b/internal/action/integration/checkout_test.go
@@ -6,24 +6,55 @@ import (
 )
 
 func TestCheckoutCommitAdmission(t *testing.T) {
-	for _, commit := range []string{CheckoutV1Commit, CheckoutV2Commit, CheckoutV3Commit, CheckoutV4Commit, CheckoutV5Commit, CheckoutV6Commit, CheckoutV7InitialCommit, CheckoutV7Commit} {
+	for _, commit := range []string{
+		CheckoutV1Commit, CheckoutV2Commit, CheckoutV3Commit, CheckoutV4Commit,
+		CheckoutV5Commit, CheckoutV6Commit, CheckoutV7InitialCommit, CheckoutV7Commit,
+		"af513c7a016048ae468971c52ed77d9562c7c819", // v1.0.0
+		"722adc63f1aa60a57ec37892e133b1d319cae598", // v2.0.0
+		"a12a3943b4bdde767164f792f33f40b04645d846", // v3.0.0
+		"f43a0e5ff2bd294095638e18286ca9a3d1956744", // v3.6.0
+		"1e31de5234b9f8995739874a8ce0492dc87873e2", // v4.0.0
+	} {
 		if err := validateCheckoutCommit(commit); err != nil {
-			t.Fatalf("audited commit %s rejected: %v", commit, err)
+			t.Fatalf("snapshotted commit %s rejected: %v", commit, err)
 		}
 	}
 	if err := validateCheckoutCommit("de0fac2e4500dabe0009e67214ff5f5447ce83dd"); err != nil {
 		t.Fatalf("upstream main commit rejected: %v", err)
 	}
-	for _, commit := range []string{
-		"f43a0e5ff2bd294095638e18286ca9a3d1956744", // v3.6.0 is an ancestor of upstream main.
-		strings.Repeat("0", 40),
-	} {
+	for _, commit := range []string{strings.Repeat("0", 40)} {
 		if err := validateCheckoutCommit(commit); err == nil || !strings.Contains(err.Error(), "does not admit") || !strings.Contains(err.Error(), CheckoutV7Commit) || !strings.Contains(err.Error(), checkoutMainSnapshotCommit) {
 			t.Fatalf("unrecognized checkout commit %s error = %v", commit, err)
 		}
 	}
 }
 
+func TestCheckoutSnapshotContracts(t *testing.T) {
+	if len(checkoutCommitContracts) < 254 {
+		t.Fatalf("snapshotted checkout commits = %d, want at least 254", len(checkoutCommitContracts))
+	}
+	for branch, tip := range checkoutSnapshotTips {
+		if _, ok := checkoutCommitContracts[tip]; !ok {
+			t.Errorf("snapshot branch %s tip %s has no admitted contract", branch, tip)
+		}
+	}
+	for commit, contract := range checkoutCommitContracts {
+		if contract.inputs == "" {
+			t.Errorf("snapshotted commit %s has no declared inputs", commit)
+		}
+		names := strings.Split(contract.inputs, ",")
+		for i, name := range names {
+			if name != strings.ToLower(name) || i > 0 && names[i-1] >= name {
+				t.Errorf("snapshotted commit %s has noncanonical inputs %q", commit, contract.inputs)
+				break
+			}
+		}
+		if contract.refOutput != contract.commitOutput {
+			t.Errorf("snapshotted commit %s declares only one checkout output", commit)
+		}
+	}
+}
+
 func TestValidateCheckoutInputs(t *testing.T) {
 	repository, sha := "buildkite/buildkite-gha", strings.Repeat("a", 40)
 	for _, inputs := range []map[string]string{
@@ -136,3 +167,32 @@ func TestValidateCheckoutLegacyInputsRejectLaterContracts(t *testing.T) {
 		})
 	}
 }
+
+func TestValidateCheckoutInputsUsesPerCommitContract(t *testing.T) {
+	repository, sha := "buildkite/buildkite-gha", strings.Repeat("a", 40)
+	for _, test := range []struct {
+		name, commit, input string
+		wantAccepted        bool
+	}{
+		{name: "v2.0 before submodules", commit: "722adc63f1aa60a57ec37892e133b1d319cae598", input: "submodules"},
+		{name: "v2.3.4 with submodules", commit: "5a4ac9002d0be2fb38bd78e4b4dbde5606d7042f", input: "submodules", wantAccepted: true},
+		{name: "v3.0 before fetch-tags", commit: "a12a3943b4bdde767164f792f33f40b04645d846", input: "fetch-tags"},
+		{name: "v3.7 with fetch-tags", commit: CheckoutV3Commit, input: "fetch-tags", wantAccepted: true},
+		{name: "v4.0 before filter", commit: "1e31de5234b9f8995739874a8ce0492dc87873e2", input: "filter"},
+		{name: "v4.2 with filter", commit: "d632683dd7b4114ad314bca15554477dd762a938", input: "filter", wantAccepted: true},
+	} {
+		t.Run(test.name, func(t *testing.T) {
+			value := "false"
+			if test.input == "filter" {
+				value = ""
+			}
+			err := ValidateCheckoutInputs(test.commit, map[string]string{test.input: value}, repository, sha)
+			if test.wantAccepted && err != nil {
+				t.Fatalf("ValidateCheckoutInputs() = %v", err)
+			}
+			if !test.wantAccepted && (err == nil || !strings.Contains(err.Error(), "unsupported by this actions/checkout release")) {
+				t.Fatalf("ValidateCheckoutInputs() = %v, want contract rejection", err)
+			}
+		})
+	}
+}
diff --git a/internal/action/integration/cmd/generate-checkout-profiles/main.go b/internal/action/integration/cmd/generate-checkout-profiles/main.go
new file mode 100644
index 00000000..4b9b1b13
--- /dev/null
+++ b/internal/action/integration/cmd/generate-checkout-profiles/main.go
@@ -0,0 +1,175 @@
+package main
+
+import (
+	"bytes"
+	"fmt"
+	"go/format"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"sort"
+	"strings"
+
+	"go.yaml.in/yaml/v4"
+)
+
+const repository = "https://github.com/actions/checkout.git"
+
+var snapshotBranches = []string{"main", "master", "releases/v1", "releases/v2", "releases/v3", "releases/v4", "releases/v5", "releases/v6"}
+
+type actionManifest struct {
+	Inputs  map[string]yaml.Node `yaml:"inputs"`
+	Outputs map[string]yaml.Node `yaml:"outputs"`
+	Runs    struct {
+		Plugin string `yaml:"plugin"`
+	} `yaml:"runs"`
+}
+
+type contract struct {
+	Inputs       string
+	FullHistory  bool
+	RefOutput    bool
+	CommitOutput bool
+}
+
+func main() {
+	output := "checkout_profiles_generated.go"
+	if len(os.Args) > 2 {
+		fatalf("usage: go run ./cmd/generate-checkout-profiles [output]")
+	}
+	if len(os.Args) == 2 {
+		output = os.Args[1]
+	}
+
+	checkout, err := os.MkdirTemp("", "buildkite-gha-checkout-profiles-")
+	if err != nil {
+		fatalf("create temporary checkout: %v", err)
+	}
+	defer func() { _ = os.RemoveAll(checkout) }()
+	run(checkout, "git", "init", "--quiet")
+	run(checkout, "git", "remote", "add", "origin", repository)
+	refspecs := []string{"--quiet", "--no-tags", "origin", "+refs/tags/*:refs/tags/*"}
+	for _, branch := range snapshotBranches {
+		refspecs = append(refspecs, "+refs/heads/"+branch+":refs/remotes/origin/"+branch)
+	}
+	run(checkout, "git", append([]string{"fetch"}, refspecs...)...)
+
+	tips := make(map[string]string, len(snapshotBranches))
+	for _, branch := range snapshotBranches {
+		tips[branch] = gitOutput(checkout, "rev-parse", "refs/remotes/origin/"+branch+"^{commit}")
+	}
+	commits := strings.Fields(gitOutput(checkout, "rev-list", "--all"))
+	contracts := make(map[string]contract)
+	for _, commit := range commits {
+		source, err := exec.Command("git", "-C", checkout, "show", commit+":action.yml").Output()
+		if err != nil {
+			source, err = exec.Command("git", "-C", checkout, "show", commit+":action.yaml").Output()
+		}
+		if err != nil {
+			continue
+		}
+		var manifest actionManifest
+		if yaml.Unmarshal(source, &manifest) != nil {
+			continue
+		}
+		outputs := sortedKeys(manifest.Outputs)
+		if len(outputs) != 0 && (len(outputs) != 2 || outputs[0] != "commit" || outputs[1] != "ref") {
+			continue
+		}
+		inputs := sortedKeys(manifest.Inputs)
+		contracts[commit] = contract{
+			Inputs:       strings.Join(inputs, ","),
+			FullHistory:  manifest.Runs.Plugin != "",
+			RefOutput:    contains(outputs, "ref"),
+			CommitOutput: contains(outputs, "commit"),
+		}
+	}
+
+	profilesByContract := map[contract]string{}
+	uniqueContracts := make([]contract, 0)
+	for _, profile := range contracts {
+		if _, ok := profilesByContract[profile]; ok {
+			continue
+		}
+		uniqueContracts = append(uniqueContracts, profile)
+		profilesByContract[profile] = ""
+	}
+	sort.Slice(uniqueContracts, func(i, j int) bool {
+		return contractKey(uniqueContracts[i]) < contractKey(uniqueContracts[j])
+	})
+	for i, profile := range uniqueContracts {
+		profilesByContract[profile] = fmt.Sprintf("checkoutProfile%02d", i+1)
+	}
+
+	var generated bytes.Buffer
+	fmt.Fprintln(&generated, "// Code generated by internal/action/integration/cmd/generate-checkout-profiles; DO NOT EDIT.")
+	fmt.Fprintln(&generated, "\npackage integration")
+	fmt.Fprintf(&generated, "\nconst checkoutMainSnapshotCommit = %q\n", tips["main"])
+	fmt.Fprintln(&generated, "\nvar checkoutSnapshotTips = map[string]string{")
+	for _, branch := range snapshotBranches {
+		fmt.Fprintf(&generated, "\t%q: %q,\n", branch, tips[branch])
+	}
+	fmt.Fprintln(&generated, "}")
+	fmt.Fprintln(&generated, "\nvar (")
+	for _, profile := range uniqueContracts {
+		fmt.Fprintf(&generated, "\t%s = checkoutContract{inputs: %q, fullHistory: %t, refOutput: %t, commitOutput: %t}\n",
+			profilesByContract[profile], profile.Inputs, profile.FullHistory, profile.RefOutput, profile.CommitOutput)
+	}
+	fmt.Fprintln(&generated, ")")
+	fmt.Fprintln(&generated, "\nvar checkoutCommitContracts = map[string]checkoutContract{")
+	commitKeys := sortedKeys(contracts)
+	for _, commit := range commitKeys {
+		fmt.Fprintf(&generated, "\t%q: %s,\n", commit, profilesByContract[contracts[commit]])
+	}
+	fmt.Fprintln(&generated, "}")
+
+	formatted, err := format.Source(generated.Bytes())
+	if err != nil {
+		fatalf("format generated source: %v", err)
+	}
+	if err := os.WriteFile(filepath.Clean(output), formatted, 0o644); err != nil {
+		fatalf("write generated source: %v", err)
+	}
+}
+
+func sortedKeys[T any](values map[string]T) []string {
+	keys := make([]string, 0, len(values))
+	for key := range values {
+		keys = append(keys, strings.ToLower(key))
+	}
+	sort.Strings(keys)
+	return keys
+}
+
+func contains(values []string, target string) bool {
+	index := sort.SearchStrings(values, target)
+	return index < len(values) && values[index] == target
+}
+
+func contractKey(profile contract) string {
+	return fmt.Sprintf("%s\x00%t\x00%t\x00%t", profile.Inputs, profile.FullHistory, profile.RefOutput, profile.CommitOutput)
+}
+
+func gitOutput(directory string, args ...string) string {
+	command := exec.Command("git", append([]string{"-C", directory}, args...)...)
+	output, err := command.Output()
+	if err != nil {
+		fatalf("git %s: %v", strings.Join(args, " "), err)
+	}
+	return strings.TrimSpace(string(output))
+}
+
+func run(directory, name string, args ...string) {
+	command := exec.Command(name, args...)
+	command.Dir = directory
+	command.Stdout = os.Stdout
+	command.Stderr = os.Stderr
+	if err := command.Run(); err != nil {
+		fatalf("%s %s: %v", name, strings.Join(args, " "), err)
+	}
+}
+
+func fatalf(format string, args ...any) {
+	fmt.Fprintf(os.Stderr, format+"\n", args...)
+	os.Exit(1)
+}
diff --git a/internal/compiler/actions_test.go b/internal/compiler/actions_test.go
index 28cbd762..437db16e 100644
--- a/internal/compiler/actions_test.go
+++ b/internal/compiler/actions_test.go
@@ -1247,9 +1247,14 @@ func TestCheckoutAdapterInputBoundary(t *testing.T) {
 func TestCheckoutAdapterCommitBoundary(t *testing.T) {
 	workspace, remote := t.TempDir(), t.TempDir()
 	for version, commit := range map[string]string{
+		"v1.0.0":     "af513c7a016048ae468971c52ed77d9562c7c819",
 		"v1.2.0":     actionintegration.CheckoutV1Commit,
+		"v2.0.0":     "722adc63f1aa60a57ec37892e133b1d319cae598",
 		"v2.8.0":     actionintegration.CheckoutV2Commit,
+		"v3.0.0":     "a12a3943b4bdde767164f792f33f40b04645d846",
+		"v3.6.0":     "f43a0e5ff2bd294095638e18286ca9a3d1956744",
 		"v3.7.0":     actionintegration.CheckoutV3Commit,
+		"v4.0.0":     "1e31de5234b9f8995739874a8ce0492dc87873e2",
 		"v4":         actionintegration.CheckoutV4Commit,
 		"v5":         actionintegration.CheckoutV5Commit,
 		"v6":         actionintegration.CheckoutV6Commit,
diff --git a/internal/runtime/checkout_test.go b/internal/runtime/checkout_test.go
index d98737a1..a2c61448 100644
--- a/internal/runtime/checkout_test.go
+++ b/internal/runtime/checkout_test.go
@@ -376,7 +376,10 @@ func TestCheckoutOutputsMatchReleaseContract(t *testing.T) {
 		{name: "v1.2.0", commit: actionintegration.CheckoutV1Commit, want: map[string]string{}},
 		{name: "v2.8.0", commit: actionintegration.CheckoutV2Commit, want: map[string]string{}},
 		{name: "v3.7.0", commit: actionintegration.CheckoutV3Commit, want: map[string]string{}},
-		{name: "v4 and later", commit: actionintegration.CheckoutV4Commit, want: map[string]string{"ref": "refs/heads/main", "commit": strings.Repeat("a", 40)}},
+		{name: "v4.0.0 before outputs", commit: "1e31de5234b9f8995739874a8ce0492dc87873e2", want: map[string]string{}},
+		{name: "v4.1.7 before outputs", commit: "692973e3d937129bcbf40652eb9f2f61becf3332", want: map[string]string{}},
+		{name: "v4.2.0 with outputs", commit: "d632683dd7b4114ad314bca15554477dd762a938", want: map[string]string{"ref": "refs/heads/main", "commit": strings.Repeat("a", 40)}},
+		{name: "current v4", commit: actionintegration.CheckoutV4Commit, want: map[string]string{"ref": "refs/heads/main", "commit": strings.Repeat("a", 40)}},
 	} {
 		t.Run(test.name, func(t *testing.T) {
 			outputs := map[string]string{}
@@ -395,6 +398,8 @@ func TestCheckoutInputsWithReleaseDefaults(t *testing.T) {
 		inputs map[string]string
 		want   map[string]string
 	}{
+		{name: "v1.0 defaults to full history", commit: "af513c7a016048ae468971c52ed77d9562c7c819", inputs: nil, want: map[string]string{"fetch-depth": "0"}},
+		{name: "v1.1 defaults to full history", commit: "0b496e91ec7ae4428c3ed2eeb4c3a40df431f2cc", inputs: nil, want: map[string]string{"fetch-depth": "0"}},
 		{name: "v1 defaults to full history", commit: actionintegration.CheckoutV1Commit, inputs: nil, want: map[string]string{"fetch-depth": "0"}},
 		{name: "v1 keeps explicit depth", commit: actionintegration.CheckoutV1Commit, inputs: map[string]string{"Fetch-Depth": "5"}, want: map[string]string{"Fetch-Depth": "5"}},
 		{name: "v2 keeps shallow default", commit: actionintegration.CheckoutV2Commit, inputs: nil, want: nil},
diff --git a/mise.toml b/mise.toml
index 77523104..548b49b9 100644
--- a/mise.toml
+++ b/mise.toml
@@ -34,7 +34,7 @@ run = "echo '--- Lint Go'; golangci-lint run"
 
 [tasks."lint:shell"]
 description = "Lint shell scripts"
-run = "echo '--- Lint shell'; shellcheck -x .buildkite/upload-examples.sh scripts/ci-buildkite-release scripts/compare-example scripts/compatibility-gaps scripts/starter-workflows-corpus scripts/update-checkout-main-commits scripts/validate-public-workflow-corpus scripts/verify-source-checkout scripts/hosted-docker-probe scripts/container-runtime-probe scripts/verify-summary-annotation scripts/verify-workflow-annotations scripts/verify-upload-artifact scripts/verify-artifact-roundtrip scripts/release scripts/release-test scripts/smoke-local testdata/actions/docker/entrypoint.sh testdata/container-runtime/.github/actions/docker/entrypoint.sh"
+run = "echo '--- Lint shell'; shellcheck -x .buildkite/upload-examples.sh scripts/ci-buildkite-release scripts/compare-example scripts/compatibility-gaps scripts/starter-workflows-corpus scripts/validate-public-workflow-corpus scripts/verify-source-checkout scripts/hosted-docker-probe scripts/container-runtime-probe scripts/verify-summary-annotation scripts/verify-workflow-annotations scripts/verify-upload-artifact scripts/verify-artifact-roundtrip scripts/release scripts/release-test scripts/smoke-local testdata/actions/docker/entrypoint.sh testdata/container-runtime/.github/actions/docker/entrypoint.sh"
 
 [tasks.lint]
 description = "Lint Go code and shell scripts"
diff --git a/scripts/update-checkout-main-commits b/scripts/update-checkout-main-commits
deleted file mode 100755
index 79b93a6f..00000000
--- a/scripts/update-checkout-main-commits
+++ /dev/null
@@ -1,43 +0,0 @@
-#!/usr/bin/env bash
-set -euo pipefail
-
-repository=https://github.com/actions/checkout.git
-v4_boundary_commit=f43a0e5ff2bd294095638e18286ca9a3d1956744
-requested_commit=${1:-}
-output=${2:-checkout_main_commits_generated.go}
-checkout=$(mktemp -d)
-trap 'rm -rf "$checkout"' EXIT
-
-git -C "$checkout" init --quiet
-git -C "$checkout" remote add origin "$repository"
-git -C "$checkout" fetch --quiet --filter=blob:none origin main
-main_commit=$(git -C "$checkout" rev-parse FETCH_HEAD)
-
-if [[ -n "$requested_commit" ]] && ! git -C "$checkout" cat-file -e "$requested_commit^{commit}" 2>/dev/null; then
-  git -C "$checkout" fetch --quiet --filter=blob:none origin "$requested_commit"
-fi
-snapshot_commit=$(git -C "$checkout" rev-parse "${requested_commit:-$main_commit}^{commit}")
-if ! git -C "$checkout" merge-base --is-ancestor "$snapshot_commit" "$main_commit"; then
-  echo "$snapshot_commit is not reachable from actions/checkout upstream main" >&2
-  exit 1
-fi
-if ! git -C "$checkout" merge-base --is-ancestor "$v4_boundary_commit" "$snapshot_commit"; then
-  echo "$snapshot_commit predates the actions/checkout v4 development boundary" >&2
-  exit 1
-fi
-
-{
-  cat <<EOF
-// Code generated by scripts/update-checkout-main-commits; DO NOT EDIT.
-
-package integration
-
-const checkoutMainSnapshotCommit = "$snapshot_commit"
-
-var checkoutMainCommits = map[string]struct{}{
-EOF
-  git -C "$checkout" rev-list "$snapshot_commit" "^$v4_boundary_commit" | LC_ALL=C sort | sed 's/^/\t"/; s/$/": {},/'
-  echo '}'
-} >"$output"
-
-gofmt -w "$output"