diff --git a/controller/gettargetgraph_test.go b/controller/gettargetgraph_test.go
index db957fdb..1c13d549 100644
--- a/controller/gettargetgraph_test.go
+++ b/controller/gettargetgraph_test.go
@@ -57,8 +57,8 @@ func TestGetTargetGraph_CacheMiss_NoSend(t *testing.T) {
 			Remote:   "repo:go-code",
 			BaseSha:  "sha",
 			Requests: []*pb.Request{
-				{Url: "github://repo/1", Commit: "abc111"},
-				{Url: "github://repo/2", Commit: "abc222"},
+				{Url: "github://github.com/org/repo/pull/1/1111111111111111111111111111111111111111"},
+				{Url: "github://github.com/org/repo/pull/2/2222222222222222222222222222222222222222"},
 			},
 		},
 	}
@@ -83,8 +83,8 @@ func TestGetTargetGraph_StorageError_Propagates(t *testing.T) {
 			Remote:   "repo:go-code",
 			BaseSha:  "sha",
 			Requests: []*pb.Request{
-				{Url: "github://repo/1", Commit: "abc111"},
-				{Url: "github://repo/2", Commit: "abc222"},
+				{Url: "github://github.com/org/repo/pull/1/1111111111111111111111111111111111111111"},
+				{Url: "github://github.com/org/repo/pull/2/2222222222222222222222222222222222222222"},
 			},
 		},
 	}, stream)
@@ -110,8 +110,8 @@ func TestGetTargetGraph_DecodeError_ReturnsError(t *testing.T) {
 			Remote:   "repo:go-code",
 			BaseSha:  "sha",
 			Requests: []*pb.Request{
-				{Url: "github://repo/1", Commit: "abc111"},
-				{Url: "github://repo/2", Commit: "abc222"},
+				{Url: "github://github.com/org/repo/pull/1/1111111111111111111111111111111111111111"},
+				{Url: "github://github.com/org/repo/pull/2/2222222222222222222222222222222222222222"},
 			},
 		},
 	}, stream)
@@ -141,8 +141,8 @@ func TestGetTargetGraph_SendsWhenItemPresent(t *testing.T) {
 			Remote:   "repo:go-code",
 			BaseSha:  "sha",
 			Requests: []*pb.Request{
-				{Url: "github://repo/1", Commit: "abc111"},
-				{Url: "github://repo/2", Commit: "abc222"},
+				{Url: "github://github.com/org/repo/pull/1/1111111111111111111111111111111111111111"},
+				{Url: "github://github.com/org/repo/pull/2/2222222222222222222222222222222222222222"},
 			},
 		},
 	}, stream)
@@ -163,8 +163,8 @@ func TestGetTargetGraph_BuildDescriptionMissingRequiredFields_ReturnsError(t *te
 			Strategy: pb.COMPUTATION_STRATEGY_UNSET,
 			Remote:   "repo:go-code",
 			Requests: []*pb.Request{
-				{Url: "github://repo/1", Commit: "abc111"},
-				{Url: "github://repo/2", Commit: "abc222"},
+				{Url: "github://github.com/org/repo/pull/1/1111111111111111111111111111111111111111"},
+				{Url: "github://github.com/org/repo/pull/2/2222222222222222222222222222222222222222"},
 			},
 		},
 	}, stream)
diff --git a/core/cachekey/cachekey_test.go b/core/cachekey/cachekey_test.go
index 48db2da6..f38006d4 100644
--- a/core/cachekey/cachekey_test.go
+++ b/core/cachekey/cachekey_test.go
@@ -54,8 +54,8 @@ func TestGetTreehashCachePath(t *testing.T) {
 		Remote:  "git@github:uber/tango",
 		BaseSha: "deadbeef",
 		ChangeRequests: []entity.ChangeRequest{
-			{URL: "github://org/repo/pull/1", Commit: "abc"},
-			{URL: "custom://foo/bar", Commit: "def"},
+			{URL: "github://github.com/org/repo/pull/1/1111111111111111111111111111111111111111"},
+			{URL: "github://github.com/org/repo/pull/2/2222222222222222222222222222222222222222"},
 		},
 	}
 	got := GetTreehashCachePath(desc)
diff --git a/core/cachekey/treehash_rapid_test.go b/core/cachekey/treehash_rapid_test.go
index c9fb0089..0eed349d 100644
--- a/core/cachekey/treehash_rapid_test.go
+++ b/core/cachekey/treehash_rapid_test.go
@@ -22,19 +22,21 @@ import (
 	"pgregory.net/rapid"
 )
 
-func TestGetTreehashCachePath_commitAffectsKey(t *testing.T) {
+func TestGetTreehashCachePath_headSHAAffectsKey(t *testing.T) {
 	rapid.Check(t, func(t *rapid.T) {
-		commit := rapid.StringMatching(`[a-z]+`).Draw(t, "commit")
+		sha := rapid.StringMatching(`[0-9a-f]{40}`).Draw(t, "sha")
+		otherSHA := rapid.StringMatching(`[0-9a-f]{40}`).Filter(func(s string) bool { return s != sha }).Draw(t, "otherSHA")
 		build := entity.BuildDescription{
 			Remote:  "git@github:uber/tango",
 			BaseSha: "base",
 			ChangeRequests: []entity.ChangeRequest{
-				{URL: "github://uber/tango/pull/1", Commit: commit},
+				{URL: "github://github.com/uber/tango/pull/1/" + sha},
 			},
 		}
 		changed := build
-		changed.ChangeRequests = append([]entity.ChangeRequest(nil), build.ChangeRequests...)
-		changed.ChangeRequests[0].Commit = commit + "x"
+		changed.ChangeRequests = []entity.ChangeRequest{
+			{URL: "github://github.com/uber/tango/pull/1/" + otherSHA},
+		}
 
 		require.NotEqual(t, GetTreehashCachePath(build), GetTreehashCachePath(changed))
 	})
@@ -42,14 +44,14 @@ func TestGetTreehashCachePath_commitAffectsKey(t *testing.T) {
 
 func TestGetTreehashCachePath_changeRequestOrderAffectsKey(t *testing.T) {
 	rapid.Check(t, func(t *rapid.T) {
-		firstCommit := rapid.StringMatching(`[a-z]+`).Draw(t, "firstCommit")
-		secondCommit := rapid.StringMatching(`[a-z]+`).Draw(t, "secondCommit")
+		firstSHA := rapid.StringMatching(`[0-9a-f]{40}`).Draw(t, "firstSHA")
+		secondSHA := rapid.StringMatching(`[0-9a-f]{40}`).Filter(func(s string) bool { return s != firstSHA }).Draw(t, "secondSHA")
 		build := entity.BuildDescription{
 			Remote:  "git@github:uber/tango",
 			BaseSha: "base",
 			ChangeRequests: []entity.ChangeRequest{
-				{URL: "github://uber/tango/pull/1", Commit: firstCommit},
-				{URL: "github://uber/tango/pull/2", Commit: secondCommit},
+				{URL: "github://github.com/uber/tango/pull/1/" + firstSHA},
+				{URL: "github://github.com/uber/tango/pull/2/" + secondSHA},
 			},
 		}
 		swapped := build
diff --git a/core/changeuri/BUILD.bazel b/core/changeuri/BUILD.bazel
new file mode 100644
index 00000000..2a735d1b
--- /dev/null
+++ b/core/changeuri/BUILD.bazel
@@ -0,0 +1,19 @@
+load("@rules_go//go:def.bzl", "go_library", "go_test")
+
+go_library(
+    name = "changeuri",
+    srcs = ["changeuri.go"],
+    importpath = "github.com/uber/tango/core/changeuri",
+    visibility = ["//visibility:public"],
+)
+
+go_test(
+    name = "changeuri_test",
+    srcs = ["changeuri_test.go"],
+    embed = [":changeuri"],
+    deps = [
+        "@com_github_stretchr_testify//assert",
+        "@com_github_stretchr_testify//require",
+        "@net_pgregory_rapid//:rapid",
+    ],
+)
diff --git a/core/changeuri/changeuri.go b/core/changeuri/changeuri.go
new file mode 100644
index 00000000..3464f2ca
--- /dev/null
+++ b/core/changeuri/changeuri.go
@@ -0,0 +1,181 @@
+// Copyright (c) 2026 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package changeuri parses and validates change URIs — the system-wide
+// identity of a code change, per the submitqueue change-URI RFC
+// (https://github.com/uber/submitqueue/blob/main/doc/rfc/change-uri.md).
+//
+// A change URI is an RFC 3986 URI of the form scheme://{host[:port]}/{path}
+// whose path pins the change to an exact code state. Only the GitHub pull
+// request scheme is supported:
+//
+//	github://{host[:port]}/{org}/{repo}/pull/{pr}/{head_sha}
+//
+// URIs are compared as opaque strings everywhere (cache keys, correlation
+// keys), so exactly one spelling per change is valid. Parse validates the
+// canonical form and rejects everything else — it never normalizes, because
+// normalization applied at one entry point and skipped at another lets two
+// spellings of one change into the system.
+package changeuri
+
+import (
+	"fmt"
+	"net/url"
+	"strings"
+)
+
+// Scheme is the URI scheme for GitHub pull requests.
+const Scheme = "github"
+
+// PullRequest is the parsed form of a canonical GitHub pull request URI.
+// Re-serializing with String yields the original URI byte-for-byte.
+type PullRequest struct {
+	// Host is the provider instance as host[:port]. The hostname is
+	// lowercase; the port, when present, is digits only and kept verbatim.
+	Host string
+	// Org is the organization path within the instance. It may span
+	// multiple path segments (e.g. "uber/frontend") and is kept verbatim.
+	Org string
+	// Repo is the repository name, kept verbatim.
+	Repo string
+	// Number is the pull request number: a positive integer without
+	// leading zeros, kept as a string to preserve the canonical spelling.
+	Number string
+	// HeadSHA is the PR's head commit at submission time: the full
+	// 40-character lowercase hex form. It pins the exact code state the
+	// URI identifies.
+	HeadSHA string
+}
+
+// String serializes the pull request back to its canonical URI form.
+func (p PullRequest) String() string {
+	return Scheme + "://" + p.Host + "/" + p.Org + "/" + p.Repo + "/pull/" + p.Number + "/" + p.HeadSHA
+}
+
+// Parse validates raw as a canonical GitHub pull request change URI and
+// returns its parsed form. Non-canonical spellings (uppercase host,
+// abbreviated or uppercase SHA, leading-zero PR number, query, fragment,
+// userinfo, empty path segments) are rejected, never normalized.
+func Parse(raw string) (PullRequest, error) {
+	u, err := url.Parse(raw)
+	if err != nil {
+		return PullRequest{}, fmt.Errorf("parse change URI: %w", err)
+	}
+	if err := validateURL(raw, u); err != nil {
+		return PullRequest{}, err
+	}
+
+	// {org…}/{repo}/pull/{pr}/{head_sha}: org spans one or more segments,
+	// so the layout is anchored from the end of the path.
+	segments := strings.Split(strings.TrimPrefix(u.EscapedPath(), "/"), "/")
+	if len(segments) < 5 {
+		return PullRequest{}, fmt.Errorf("change URI path must be {org}/{repo}/pull/{pr}/{head_sha}: %q", raw)
+	}
+	for _, s := range segments {
+		if s == "" {
+			return PullRequest{}, fmt.Errorf("change URI path must not contain empty segments: %q", raw)
+		}
+	}
+	n := len(segments)
+	if segments[n-3] != "pull" {
+		return PullRequest{}, fmt.Errorf("change URI path must be {org}/{repo}/pull/{pr}/{head_sha}: %q", raw)
+	}
+	number, headSHA := segments[n-2], segments[n-1]
+	if !isCanonicalNumber(number) {
+		return PullRequest{}, fmt.Errorf("pull request number must be a positive integer without leading zeros, got %q", number)
+	}
+	if !isCanonicalSHA(headSHA) {
+		return PullRequest{}, fmt.Errorf("head SHA must be the full 40-character lowercase hex form, got %q", headSHA)
+	}
+
+	p := PullRequest{
+		Host:    u.Host,
+		Org:     strings.Join(segments[:n-4], "/"),
+		Repo:    segments[n-4],
+		Number:  number,
+		HeadSHA: headSHA,
+	}
+	// Canonical form round-trips byte-for-byte. This catches every
+	// non-canonical spelling net/url silently tolerates (uppercase scheme,
+	// percent-encoding variants, default-port cosmetics).
+	if p.String() != raw {
+		return PullRequest{}, fmt.Errorf("change URI is not in canonical form: %q", raw)
+	}
+	return p, nil
+}
+
+// validateURL enforces the URI-level canonical-form rules: the github
+// scheme, an authority with a lowercase hostname and an optional
+// digits-only port, and no userinfo, query, or fragment.
+func validateURL(raw string, u *url.URL) error {
+	if u.Scheme != Scheme {
+		return fmt.Errorf("unsupported scheme %q: only %q is supported", u.Scheme, Scheme)
+	}
+	if u.Opaque != "" {
+		return fmt.Errorf("change URI must have an authority: %q", raw)
+	}
+	if u.User != nil {
+		return fmt.Errorf("change URI must not contain userinfo: %q", raw)
+	}
+	if u.RawQuery != "" || u.ForceQuery || u.Fragment != "" {
+		return fmt.Errorf("change URI must not contain a query or fragment: %q", raw)
+	}
+	return validateHost(u)
+}
+
+// validateHost enforces the RFC host rules: required, lowercase hostname
+// (rejected, not folded), and an optional digits-only port kept verbatim.
+func validateHost(u *url.URL) error {
+	if u.Hostname() == "" {
+		return fmt.Errorf("change URI host is required: %q", u.String())
+	}
+	if strings.ToLower(u.Hostname()) != u.Hostname() {
+		return fmt.Errorf("change URI host must be lowercase: %q", u.Host)
+	}
+	// net/url validates that a present port is numeric, but tolerates a
+	// trailing colon with an empty port, which would round-trip.
+	if strings.HasSuffix(u.Host, ":") {
+		return fmt.Errorf("change URI port must not be empty: %q", u.Host)
+	}
+	return nil
+}
+
+// isCanonicalNumber reports whether s is a positive integer without leading
+// zeros.
+func isCanonicalNumber(s string) bool {
+	if s == "" || s[0] < '1' || s[0] > '9' {
+		return false
+	}
+	for i := 1; i < len(s); i++ {
+		if s[i] < '0' || s[i] > '9' {
+			return false
+		}
+	}
+	return true
+}
+
+// isCanonicalSHA reports whether s is a full 40-character lowercase hex
+// commit SHA.
+func isCanonicalSHA(s string) bool {
+	if len(s) != 40 {
+		return false
+	}
+	for i := 0; i < len(s); i++ {
+		c := s[i]
+		if (c < '0' || c > '9') && (c < 'a' || c > 'f') {
+			return false
+		}
+	}
+	return true
+}
diff --git a/core/changeuri/changeuri_test.go b/core/changeuri/changeuri_test.go
new file mode 100644
index 00000000..dbcb36ea
--- /dev/null
+++ b/core/changeuri/changeuri_test.go
@@ -0,0 +1,135 @@
+// Copyright (c) 2026 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package changeuri
+
+import (
+	"strconv"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"pgregory.net/rapid"
+)
+
+const _sha = "c3a4b5d6e7f80912a3b4c5d6e7f80912a3b4c5d6"
+
+func TestParse_Valid(t *testing.T) {
+	tests := []struct {
+		name string
+		in   string
+		want PullRequest
+	}{
+		{
+			name: "simple",
+			in:   "github://github.com/uber/tango/pull/123/" + _sha,
+			want: PullRequest{Host: "github.com", Org: "uber", Repo: "tango", Number: "123", HeadSHA: _sha},
+		},
+		{
+			name: "internal host",
+			in:   "github://github.uberinternal.com/uber/submitqueue/pull/1/" + _sha,
+			want: PullRequest{Host: "github.uberinternal.com", Org: "uber", Repo: "submitqueue", Number: "1", HeadSHA: _sha},
+		},
+		{
+			name: "host with port",
+			in:   "github://github.example.com:8443/org/repo/pull/42/" + _sha,
+			want: PullRequest{Host: "github.example.com:8443", Org: "org", Repo: "repo", Number: "42", HeadSHA: _sha},
+		},
+		{
+			name: "nested org",
+			in:   "github://github.com/uber/frontend/webapp/pull/7/" + _sha,
+			want: PullRequest{Host: "github.com", Org: "uber/frontend", Repo: "webapp", Number: "7", HeadSHA: _sha},
+		},
+		{
+			name: "org segment literally named pull",
+			in:   "github://github.com/org/pull/repo/pull/9/" + _sha,
+			want: PullRequest{Host: "github.com", Org: "org/pull", Repo: "repo", Number: "9", HeadSHA: _sha},
+		},
+		{
+			name: "case-sensitive org and repo kept verbatim",
+			in:   "github://github.com/Uber/Tango/pull/5/" + _sha,
+			want: PullRequest{Host: "github.com", Org: "Uber", Repo: "Tango", Number: "5", HeadSHA: _sha},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := Parse(tt.in)
+			require.NoError(t, err)
+			assert.Equal(t, tt.want, got)
+			assert.Equal(t, tt.in, got.String(), "round-trip must be byte-for-byte")
+		})
+	}
+}
+
+func TestParse_Invalid(t *testing.T) {
+	tests := []struct {
+		name string
+		in   string
+	}{
+		{name: "empty", in: ""},
+		{name: "no scheme", in: "github.com/uber/tango/pull/123/" + _sha},
+		{name: "wrong scheme", in: "phab://phabricator.example.com/D12345/67890"},
+		{name: "https web URL", in: "https://github.com/uber/tango/pull/123"},
+		{name: "missing host", in: "github:///uber/tango/pull/123/" + _sha},
+		{name: "legacy hostless form", in: "github://uber/tango/pull/123"},
+		{name: "uppercase host", in: "github://GitHub.com/uber/tango/pull/123/" + _sha},
+		{name: "uppercase scheme", in: "GITHUB://github.com/uber/tango/pull/123/" + _sha},
+		{name: "userinfo", in: "github://user@github.com/uber/tango/pull/123/" + _sha},
+		{name: "empty port", in: "github://github.com:/uber/tango/pull/123/" + _sha},
+		{name: "non-numeric port", in: "github://github.com:abc/uber/tango/pull/123/" + _sha},
+		{name: "query", in: "github://github.com/uber/tango/pull/123/" + _sha + "?x=1"},
+		{name: "bare question mark", in: "github://github.com/uber/tango/pull/123/" + _sha + "?"},
+		{name: "fragment", in: "github://github.com/uber/tango/pull/123/" + _sha + "#frag"},
+		{name: "missing head sha", in: "github://github.com/uber/tango/pull/123"},
+		{name: "short sha", in: "github://github.com/uber/tango/pull/123/c3a4b5d"},
+		{name: "uppercase sha", in: "github://github.com/uber/tango/pull/123/C3A4B5D6E7F80912A3B4C5D6E7F80912A3B4C5D6"},
+		{name: "non-hex sha", in: "github://github.com/uber/tango/pull/123/z3a4b5d6e7f80912a3b4c5d6e7f80912a3b4c5d6"},
+		{name: "zero pr number", in: "github://github.com/uber/tango/pull/0/" + _sha},
+		{name: "leading-zero pr number", in: "github://github.com/uber/tango/pull/0123/" + _sha},
+		{name: "non-numeric pr number", in: "github://github.com/uber/tango/pull/12a/" + _sha},
+		{name: "missing pull segment", in: "github://github.com/uber/tango/123/" + _sha},
+		{name: "missing repo", in: "github://github.com/uber/pull/123/" + _sha},
+		{name: "trailing slash", in: "github://github.com/uber/tango/pull/123/" + _sha + "/"},
+		{name: "empty path segment", in: "github://github.com/uber//tango/pull/123/" + _sha},
+		{name: "no path", in: "github://github.com"},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			_, err := Parse(tt.in)
+			require.Error(t, err)
+		})
+	}
+}
+
+func TestParse_RoundTrip(t *testing.T) {
+	segment := rapid.StringMatching(`[A-Za-z0-9][A-Za-z0-9._-]{0,20}`)
+	rapid.Check(t, func(t *rapid.T) {
+		p := PullRequest{
+			Host:    rapid.StringMatching(`[a-z0-9.-]{1,30}(:[1-9][0-9]{0,4})?`).Draw(t, "host"),
+			Org:     segment.Draw(t, "org"),
+			Repo:    segment.Draw(t, "repo"),
+			Number:  strconv.Itoa(rapid.IntRange(1, 1<<30).Draw(t, "number")),
+			HeadSHA: rapid.StringMatching(`[0-9a-f]{40}`).Draw(t, "sha"),
+		}
+		parsed, err := Parse(p.String())
+		if err != nil {
+			// Some generated hosts are not valid URI authorities (e.g. a
+			// bare "-"); rejection is fine, silent mutation is not.
+			return
+		}
+		require.Equal(t, p.String(), parsed.String(), "parse then serialize must round-trip byte-for-byte")
+		require.Equal(t, p.Number, parsed.Number)
+		require.Equal(t, p.HeadSHA, parsed.HeadSHA)
+	})
+}
diff --git a/core/workspace/BUILD.bazel b/core/workspace/BUILD.bazel
index d762ffb3..8a48972b 100644
--- a/core/workspace/BUILD.bazel
+++ b/core/workspace/BUILD.bazel
@@ -10,6 +10,7 @@ go_library(
     importpath = "github.com/uber/tango/core/workspace",
     visibility = ["//visibility:public"],
     deps = [
+        "//core/changeuri",
         "//core/git",
         "@org_uber_go_zap//:zap",
     ],
diff --git a/core/workspace/gitrequest.go b/core/workspace/gitrequest.go
index 7432848d..304492a0 100644
--- a/core/workspace/gitrequest.go
+++ b/core/workspace/gitrequest.go
@@ -17,7 +17,6 @@ package workspace
 import (
 	"context"
 	"fmt"
-	"path/filepath"
 
 	"github.com/uber/tango/core/git"
 	"go.uber.org/zap"
@@ -27,38 +26,37 @@ type gitRequest struct {
 	git       git.Interface
 	requestID string
 	baseRef   string
-	commit    string
+	headSHA   string
 	logger    *zap.SugaredLogger
 }
 
-func NewGitRequest(git git.Interface, requestPath string, baseRef string, commit string, logger *zap.SugaredLogger) Request {
-	// get the last part of the request path
-	requestID := filepath.Base(requestPath)
+// NewGitRequest creates a Request that applies a GitHub pull request.
+// requestID and headSHA come from the parsed change URI; see
+// https://github.com/uber/submitqueue/blob/main/doc/rfc/change-uri.md.
+func NewGitRequest(git git.Interface, requestID string, baseRef string, headSHA string, logger *zap.SugaredLogger) Request {
 	return &gitRequest{
 		git:       git,
 		requestID: requestID,
 		baseRef:   baseRef,
-		commit:    commit,
+		headSHA:   headSHA,
 		logger:    logger,
 	}
 }
 
 // Apply applies the change request to the workspace.
 func (r *gitRequest) Apply(ctx context.Context) error {
-	r.logger.Infow("gitRequest: Applying PR", zap.String("request_id", r.requestID), zap.String("base_ref", r.baseRef), zap.String("commit", r.commit))
+	r.logger.Infow("gitRequest: Applying PR", zap.String("request_id", r.requestID), zap.String("base_ref", r.baseRef), zap.String("head_sha", r.headSHA))
 	ref := fmt.Sprintf("+pull/%s/head:pull/%s/head", r.requestID, r.requestID)
 	err := r.git.Fetch(ctx, "origin", ref, "--force", "--no-tags")
 	if err != nil {
 		return fmt.Errorf("fetch PR %s: %w", r.requestID, err)
 	}
-	if r.commit != "" {
-		isAncestor, err := r.git.IsAncestor(ctx, r.commit, fmt.Sprintf("pull/%s/head", r.requestID))
-		if err != nil {
-			return fmt.Errorf("failed to read PR commit history: %w", err)
-		}
-		if !isAncestor {
-			return fmt.Errorf("commit %q is not an ancestor of PR %s", r.commit, r.requestID)
-		}
+	isAncestor, err := r.git.IsAncestor(ctx, r.headSHA, fmt.Sprintf("pull/%s/head", r.requestID))
+	if err != nil {
+		return fmt.Errorf("failed to read PR commit history: %w", err)
+	}
+	if !isAncestor {
+		return fmt.Errorf("head SHA %q is not an ancestor of PR %s", r.headSHA, r.requestID)
 	}
 	patch, err := r.git.Diff(ctx, r.baseRef, fmt.Sprintf("pull/%s/head", r.requestID), "--binary", "--merge-base")
 	if err != nil {
diff --git a/core/workspace/gitrequest_test.go b/core/workspace/gitrequest_test.go
index d0bc84e4..efcdbda0 100644
--- a/core/workspace/gitrequest_test.go
+++ b/core/workspace/gitrequest_test.go
@@ -26,21 +26,16 @@ import (
 	"go.uber.org/zap"
 )
 
-func TestNewGitRequest_InvalidPath(t *testing.T) {
-	req := NewGitRequest(nil, "invalid", "baseRef", "", zap.NewNop().Sugar())
-	require.NotNil(t, req)
-}
-
-func TestNewGitRequest_ExtractsID(t *testing.T) {
-	r := NewGitRequest(nil, "/org/repo/pull/456", "baseRef", "abc123", zap.NewNop().Sugar())
+func TestNewGitRequest_Fields(t *testing.T) {
+	r := NewGitRequest(nil, "456", "baseRef", _testHeadSHA, zap.NewNop().Sugar())
 	gr, ok := r.(*gitRequest)
 	assert.True(t, ok, "expected *gitRequest, got %T", r)
 	assert.Equal(t, "456", gr.requestID)
 	assert.Equal(t, "baseRef", gr.baseRef)
-	assert.Equal(t, "abc123", gr.commit)
+	assert.Equal(t, _testHeadSHA, gr.headSHA)
 }
 
-func TestGitRequest_Apply_CommitIsAncestor_Success(t *testing.T) {
+func TestGitRequest_Apply_HeadSHAIsAncestor_Success(t *testing.T) {
 	ctrl := gomock.NewController(t)
 	git := gitmock.NewMockInterface(ctrl)
 	git.EXPECT().Fetch(gomock.Any(), "origin", gomock.Any(), gomock.Any()).Return(nil)
@@ -54,7 +49,7 @@ func TestGitRequest_Apply_CommitIsAncestor_Success(t *testing.T) {
 	require.NoError(t, err)
 }
 
-func TestGitRequest_Apply_CommitNotAncestor_ReturnsError(t *testing.T) {
+func TestGitRequest_Apply_HeadSHANotAncestor_ReturnsError(t *testing.T) {
 	ctrl := gomock.NewController(t)
 	git := gitmock.NewMockInterface(ctrl)
 	git.EXPECT().Fetch(gomock.Any(), "origin", gomock.Any(), gomock.Any()).Return(nil)
diff --git a/core/workspace/request.go b/core/workspace/request.go
index c5bc2ef2..69dcaf32 100644
--- a/core/workspace/request.go
+++ b/core/workspace/request.go
@@ -19,6 +19,7 @@ import (
 	"fmt"
 	"net/url"
 
+	"github.com/uber/tango/core/changeuri"
 	"github.com/uber/tango/core/git"
 	"go.uber.org/zap"
 )
@@ -28,15 +29,20 @@ type Request interface {
 	Apply(ctx context.Context) error
 }
 
-// NewRequest creates a new request based on the request URL.
-func NewRequest(rawURL string, g git.Interface, baseRef string, commit string, logger *zap.SugaredLogger) (Request, error) {
+// NewRequest creates a new request from a canonical change URI, e.g.
+// github://{host[:port]}/{org}/{repo}/pull/{pr}/{head_sha}.
+func NewRequest(rawURL string, g git.Interface, baseRef string, logger *zap.SugaredLogger) (Request, error) {
 	u, err := url.Parse(rawURL)
 	if err != nil {
 		return nil, err
 	}
 	switch u.Scheme {
-	case "github":
-		return NewGitRequest(g, u.Path, baseRef, commit, logger), nil
+	case changeuri.Scheme:
+		pr, err := changeuri.Parse(rawURL)
+		if err != nil {
+			return nil, fmt.Errorf("invalid change URI %q: %w", rawURL, err)
+		}
+		return NewGitRequest(g, pr.Number, baseRef, pr.HeadSHA, logger), nil
 	}
 	return nil, fmt.Errorf("unsupported scheme: %v", u.Scheme)
 }
diff --git a/core/workspace/request_test.go b/core/workspace/request_test.go
index 15db59ff..6ac70778 100644
--- a/core/workspace/request_test.go
+++ b/core/workspace/request_test.go
@@ -22,17 +22,19 @@ import (
 	"go.uber.org/zap"
 )
 
+const _testHeadSHA = "c3a4b5d6e7f80912a3b4c5d6e7f80912a3b4c5d6"
+
 func TestNewRequest_Github_Success(t *testing.T) {
-	rawURL := "github://org/repo/pull/123"
+	rawURL := "github://github.com/org/repo/pull/123/" + _testHeadSHA
 	var g git.Interface = nil
 
-	req, err := NewRequest(rawURL, g, "baseRef", "abc123", zap.NewNop().Sugar())
+	req, err := NewRequest(rawURL, g, "baseRef", zap.NewNop().Sugar())
 	require.NoError(t, err)
 	require.NotNil(t, req)
 	gr, ok := req.(*gitRequest)
 	require.True(t, ok, "returned Request should be *gitRequest")
 	require.Equal(t, "123", gr.requestID)
-	require.Equal(t, "abc123", gr.commit)
+	require.Equal(t, _testHeadSHA, gr.headSHA)
 	require.Nil(t, gr.git)
 }
 
@@ -40,7 +42,7 @@ func TestNewRequest_InvalidURL(t *testing.T) {
 	rawURL := "://bad"
 	var g git.Interface = nil
 
-	req, err := NewRequest(rawURL, g, "baseRef", "", zap.NewNop().Sugar())
+	req, err := NewRequest(rawURL, g, "baseRef", zap.NewNop().Sugar())
 	require.Error(t, err)
 	require.Nil(t, req)
 }
@@ -49,7 +51,26 @@ func TestNewRequest_InvalidScheme(t *testing.T) {
 	rawURL := "phabricator://bad"
 	var g git.Interface = nil
 
-	req, err := NewRequest(rawURL, g, "baseRef", "", zap.NewNop().Sugar())
+	req, err := NewRequest(rawURL, g, "baseRef", zap.NewNop().Sugar())
 	require.Error(t, err)
 	require.Nil(t, req)
 }
+
+func TestNewRequest_NonCanonicalURI(t *testing.T) {
+	tests := []struct {
+		name string
+		url  string
+	}{
+		{name: "legacy hostless form", url: "github://org/repo/pull/123"},
+		{name: "missing head sha", url: "github://github.com/org/repo/pull/123"},
+		{name: "uppercase host", url: "github://GitHub.com/org/repo/pull/123/" + _testHeadSHA},
+		{name: "short sha", url: "github://github.com/org/repo/pull/123/abc123"},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			req, err := NewRequest(tt.url, nil, "baseRef", zap.NewNop().Sugar())
+			require.Error(t, err)
+			require.Nil(t, req)
+		})
+	}
+}
diff --git a/entity/build_description.go b/entity/build_description.go
index 23d7fcba..6bcebc2c 100644
--- a/entity/build_description.go
+++ b/entity/build_description.go
@@ -3,10 +3,16 @@ package entity
 // ChangeRequest describes a single change (PR, diff) to layer on top of a
 // base revision.
 type ChangeRequest struct {
-	// URL identifies the change request (PR/diff link) being layered on.
+	// URL identifies the change request. Its format is interpreted by the
+	// Orchestrator implementation that consumes it: the bundled native
+	// orchestrator requires a canonical change URI of the form
+	// github://{host[:port]}/{org}/{repo}/pull/{pr}/{head_sha}, per the
+	// change-URI RFC
+	// (https://github.com/uber/submitqueue/blob/main/doc/rfc/change-uri.md),
+	// whose embedded head SHA pins the exact code state; custom
+	// orchestrators may accept formats of their own. The URL participates
+	// in cache keys as an opaque string.
 	URL string
-	// Commit is the SHA to apply on top of the base revision.
-	Commit string
 }
 
 // BuildDescription identifies a repository state: a base revision plus
diff --git a/example/README.md b/example/README.md
index 98ec86e8..369313d2 100644
--- a/example/README.md
+++ b/example/README.md
@@ -48,6 +48,8 @@ and flags for limiting changed-target distance (`-max-distance`), cache bypass
 `-include-attributes`), and request URLs (`-request-urls`,
 `-new-request-urls`). Run with `-h` for the full list.
 
+Change requests are identified by canonical change URIs of the form `github://{host[:port]}/{org}/{repo}/pull/{pr}/{head_sha}`, per the [change-URI RFC](https://github.com/uber/submitqueue/blob/main/doc/rfc/change-uri.md) — for example `github://github.com/uber/tango/pull/123/c3a4b5d6e7f80912a3b4c5d6e7f80912a3b4c5d6`. The head SHA is the PR's head commit at submission time; it pins the exact code state applied on top of the base revision and forms the cache identity. The bundled native orchestrator rejects non-canonical spellings (uppercase host, abbreviated SHA, missing host); custom Orchestrator implementations may accept formats of their own.
+
 ## Benchmarking
 
 The query-bench tool times the standard Tango query against a real Bazel
diff --git a/example/client/client.go b/example/client/client.go
index 031bdd45..c439284a 100644
--- a/example/client/client.go
+++ b/example/client/client.go
@@ -36,7 +36,7 @@ func main() {
 	method := flag.String("method", "get-target-graph", "method to call: get-target-graph, get-changed-targets")
 	remote := flag.String("remote", "", "build description remote")
 	baseSHA := flag.String("base-sha", "", "build description base sha")
-	reqURLs := flag.String("request-urls", "", "comma-separated change request URLs")
+	reqURLs := flag.String("request-urls", "", "comma-separated canonical change URIs, e.g. github://{host}/{org}/{repo}/pull/{pr}/{head_sha}")
 	timeout := flag.Duration("timeout", 5*time.Minute, "request timeout")
 	maxDistance := flag.Int("max-distance", -1, "max distance for changed targets")
 	bypassCache := flag.Bool("bypass-cache", false, "skip cache lookup and force recomputation, overwriting cached result")
@@ -45,7 +45,7 @@ func main() {
 	includeAttributes := flag.Bool("include-attributes", false, "include per-target attributes + attribute mappings in responses (proto3 default: false)")
 
 	newBaseSHA := flag.String("new-base-sha", "", "build description new base sha")
-	newRequestURLs := flag.String("new-request-urls", "", "comma-separated change request URLs for new state")
+	newRequestURLs := flag.String("new-request-urls", "", "comma-separated canonical change URIs for new state, e.g. github://{host}/{org}/{repo}/pull/{pr}/{head_sha}")
 	flag.Parse()
 
 	grpcTransport := yarpcgrpc.NewTransport()
diff --git a/internal/mapper/build_description.go b/internal/mapper/build_description.go
index cf8f5b30..8962a73f 100644
--- a/internal/mapper/build_description.go
+++ b/internal/mapper/build_description.go
@@ -43,8 +43,7 @@ func toChangeRequests(requests []*tangopb.Request) []entity.ChangeRequest {
 	out := make([]entity.ChangeRequest, len(requests))
 	for i, r := range requests {
 		out[i] = entity.ChangeRequest{
-			URL:    r.GetUrl(),
-			Commit: r.GetCommit(),
+			URL: r.GetUrl(),
 		}
 	}
 	return out
diff --git a/internal/mapper/build_description_test.go b/internal/mapper/build_description_test.go
index d61e17e5..2bea8511 100644
--- a/internal/mapper/build_description_test.go
+++ b/internal/mapper/build_description_test.go
@@ -44,8 +44,10 @@ func TestProtoToBuildDescription(t *testing.T) {
 				Remote:  "git@example.com:org/repo",
 				BaseSha: "abc123",
 				Requests: []*tangopb.Request{
-					{Url: "https://example.com/pr/1", Commit: "sha1"},
-					{Url: "https://example.com/pr/2", Commit: "sha2"},
+					{Url: "github://github.com/org/repo/pull/1/1111111111111111111111111111111111111111"},
+					// URL format is orchestrator-specific; the mapper passes
+					// it through opaquely without validation.
+					{Url: "https://example.com/pr/2"},
 				},
 				Strategy: tangopb.COMPUTATION_STRATEGY_NATIVE,
 			},
@@ -53,8 +55,8 @@ func TestProtoToBuildDescription(t *testing.T) {
 				Remote:  "git@example.com:org/repo",
 				BaseSha: "abc123",
 				ChangeRequests: []entity.ChangeRequest{
-					{URL: "https://example.com/pr/1", Commit: "sha1"},
-					{URL: "https://example.com/pr/2", Commit: "sha2"},
+					{URL: "github://github.com/org/repo/pull/1/1111111111111111111111111111111111111111"},
+					{URL: "https://example.com/pr/2"},
 				},
 				Strategy: entity.ComputationStrategyNative,
 			},
diff --git a/internal/url/url.go b/internal/url/url.go
index 18fb1eaf..62197279 100644
--- a/internal/url/url.go
+++ b/internal/url/url.go
@@ -33,7 +33,6 @@ func ToShortRemote(remote string) string {
 }
 
 // GetReqURLsHash returns a fixed-length hash of the ordered change requests.
-// Both URL and commit participate because either can change the materialized tree.
 func GetReqURLsHash(requests []entity.ChangeRequest) string {
 	if len(requests) == 0 {
 		return ""
@@ -41,7 +40,6 @@ func GetReqURLsHash(requests []entity.ChangeRequest) string {
 	h := md5.New()
 	for _, request := range requests {
 		writeFramedString(h, request.URL)
-		writeFramedString(h, request.Commit)
 	}
 	return fmt.Sprintf("%x", h.Sum(nil))
 }
diff --git a/internal/url/url_test.go b/internal/url/url_test.go
index 9e512d9b..fa1e7252 100644
--- a/internal/url/url_test.go
+++ b/internal/url/url_test.go
@@ -58,10 +58,14 @@ func TestGetReqURLsHash(t *testing.T) {
 	md5hex := func(requests ...entity.ChangeRequest) string {
 		h := md5.New()
 		for _, request := range requests {
-			fmt.Fprintf(h, "%d:%s%d:%s", len(request.URL), request.URL, len(request.Commit), request.Commit)
+			fmt.Fprintf(h, "%d:%s", len(request.URL), request.URL)
 		}
 		return fmt.Sprintf("%x", h.Sum(nil))
 	}
+	const (
+		uri1 = "github://github.com/org/repo/pull/42/c3a4b5d6e7f80912a3b4c5d6e7f80912a3b4c5d6"
+		uri2 = "github://github.com/org/repo/pull/43/1111111111111111111111111111111111111111"
+	)
 	tests := []struct {
 		name string
 		in   []entity.ChangeRequest
@@ -74,18 +78,18 @@ func TestGetReqURLsHash(t *testing.T) {
 		},
 		{
 			name: "single",
-			in:   []entity.ChangeRequest{{URL: "github://org/repo/pull/42", Commit: "abc"}},
-			want: md5hex(entity.ChangeRequest{URL: "github://org/repo/pull/42", Commit: "abc"}),
+			in:   []entity.ChangeRequest{{URL: uri1}},
+			want: md5hex(entity.ChangeRequest{URL: uri1}),
 		},
 		{
 			name: "multiple",
-			in:   []entity.ChangeRequest{{URL: "a", Commit: "1"}, {URL: "b", Commit: "2"}},
-			want: md5hex(entity.ChangeRequest{URL: "a", Commit: "1"}, entity.ChangeRequest{URL: "b", Commit: "2"}),
+			in:   []entity.ChangeRequest{{URL: uri1}, {URL: uri2}},
+			want: md5hex(entity.ChangeRequest{URL: uri1}, entity.ChangeRequest{URL: uri2}),
 		},
 		{
 			name: "reverse order",
-			in:   []entity.ChangeRequest{{URL: "b", Commit: "2"}, {URL: "a", Commit: "1"}},
-			want: md5hex(entity.ChangeRequest{URL: "b", Commit: "2"}, entity.ChangeRequest{URL: "a", Commit: "1"}),
+			in:   []entity.ChangeRequest{{URL: uri2}, {URL: uri1}},
+			want: md5hex(entity.ChangeRequest{URL: uri2}, entity.ChangeRequest{URL: uri1}),
 		},
 	}
 	for _, tt := range tests {
diff --git a/orchestrator/native_orchestrator.go b/orchestrator/native_orchestrator.go
index 718f98b8..4c0f7b41 100644
--- a/orchestrator/native_orchestrator.go
+++ b/orchestrator/native_orchestrator.go
@@ -150,9 +150,9 @@ func (b *nativeOrchestrator) GetTargetGraph(ctx context.Context, req entity.GetT
 
 	gitModule := gitFactory(ws.Path())
 	for _, req := range build.ChangeRequests {
-		request, err := workspace.NewRequest(req.URL, gitModule, build.BaseSha, req.Commit, logger)
+		request, err := workspace.NewRequest(req.URL, gitModule, build.BaseSha, logger)
 		if err != nil {
-			return nil, fmt.Errorf("create request for %q: %w", req.URL, err)
+			return nil, tangoerrors.NewUser(fmt.Errorf("create request for %q: %w", req.URL, err))
 		}
 		requests = append(requests, request)
 	}
diff --git a/orchestrator/native_orchestrator_test.go b/orchestrator/native_orchestrator_test.go
index 005fc3cb..28ad7865 100644
--- a/orchestrator/native_orchestrator_test.go
+++ b/orchestrator/native_orchestrator_test.go
@@ -234,7 +234,7 @@ func TestNative_GetTargetGraph_AppliesGitHubPR(t *testing.T) {
 		Build: entity.BuildDescription{
 			Remote:         "git@github:uber/tango",
 			BaseSha:        "1234567890",
-			ChangeRequests: []entity.ChangeRequest{{URL: "github://org/repo/pull/123"}},
+			ChangeRequests: []entity.ChangeRequest{{URL: "github://github.com/org/repo/pull/123/c3a4b5d6e7f80912a3b4c5d6e7f80912a3b4c5d6"}},
 		},
 	})
 	require.NoError(t, err)
@@ -245,6 +245,39 @@ func TestNative_GetTargetGraph_AppliesGitHubPR(t *testing.T) {
 	require.NotNil(t, chunk.Targets)
 }
 
+func TestNative_GetTargetGraph_InvalidChangeURI_UserError(t *testing.T) {
+	ctrl := gomock.NewController(t)
+	defer ctrl.Finish()
+	st := storagemock.NewMockStorage(ctrl)
+	g := gitmock.NewMockInterface(ctrl)
+	ws := workspacemock.NewMockWorkspace(ctrl)
+	ws.EXPECT().Path().Return("/tmp/ws")
+	ws.EXPECT().Checkout(gomock.Any(), gomock.Any(), gomock.Any()).Return(nil)
+	ws.EXPECT().Release().Return(nil)
+	rm := repomanagermock.NewMockRepoManager(ctrl)
+	rm.EXPECT().Lease(gomock.Any(), gomock.Any()).Return(ws, nil)
+	o, err := NewNativeOrchestrator(context.Background(), Params{
+		Storage:     st,
+		RepoManager: rm,
+		Logger:      zaptest.NewLogger(t).Sugar(),
+		GitFactory:  func(dir string) git.Interface { return g },
+		Config:      testConfig(t),
+	})
+	require.NoError(t, err)
+	resp, err := o.GetTargetGraph(context.Background(), entity.GetTargetGraphRequest{
+		Build: entity.BuildDescription{
+			Remote:  "git@github:uber/tango",
+			BaseSha: "1234567890",
+			// Legacy hostless form without a head SHA — rejected by the
+			// native orchestrator as a user error.
+			ChangeRequests: []entity.ChangeRequest{{URL: "github://org/repo/pull/123"}},
+		},
+	})
+	require.Error(t, err)
+	require.Nil(t, resp)
+	assert.Equal(t, tangoerrors.ErrorUser, tangoerrors.GetErrorCode(err))
+}
+
 func TestNewNativeOrchestrator_usesProvidedConfig(t *testing.T) {
 	cfg := testConfig(t)
 
diff --git a/proto/tango.proto b/proto/tango.proto
index fec1ef1d..8df3cd68 100644
--- a/proto/tango.proto
+++ b/proto/tango.proto
@@ -19,12 +19,17 @@ message TangoError {
     string message = 2;
 }
 
-// Request represents a single change request with a URL and optional commit SHA.
+// Request represents a single change request, identified by a change URI.
 message Request {
-    // The URL of the change request (e.g., a GitHub pull request URL or Phabricator diff URL)
+    // The change URI of the request. The format is interpreted by the
+    // Orchestrator implementation: the bundled native orchestrator requires
+    // the canonical change-URI form
+    // github://{host[:port]}/{org}/{repo}/pull/{pr}/{head_sha}
+    // e.g. github://github.com/uber/tango/pull/123/c3a4b5d6e7f80912a3b4c5d6e7f80912a3b4c5d6
+    // whose embedded head SHA pins the exact code state; custom
+    // orchestrators may accept formats of their own. The URL participates
+    // in cache keys as an opaque string.
     string url = 1;
-    // The commit SHA associated with the change request
-    string commit = 2;
 }
 
 // BuildDescription defines a Storage state by a primary revision string and
@@ -35,8 +40,9 @@ message BuildDescription {
     // The base commit sha of the Storage
     string base_sha = 2;
     // List of change requests to apply on top of the base revision.
-    // Each request contains a URL (e.g., a GitHub pull request or Phabricator diff URL)
-    // and an required commit SHA. If empty, the computation happens on the base revision.
+    // Each request is identified by a canonical change URI whose embedded
+    // head SHA pins the applied content. If empty, the computation happens
+    // on the base revision.
     repeated Request requests = 3;
     // The computation strategy of the original target graph
     ComputationStrategy strategy = 4;
diff --git a/tangopb/tango.pb.go b/tangopb/tango.pb.go
index 80bc7ae9..61c5c36f 100644
--- a/tangopb/tango.pb.go
+++ b/tangopb/tango.pb.go
@@ -172,12 +172,17 @@ func (m *TangoError) GetMessage() string {
 	return ""
 }
 
-// Request represents a single change request with a URL and optional commit SHA.
+// Request represents a single change request, identified by a change URI.
 type Request struct {
-	// The URL of the change request (e.g., a GitHub pull request URL or Phabricator diff URL)
+	// The change URI of the request. The format is interpreted by the
+	// Orchestrator implementation: the bundled native orchestrator requires
+	// the canonical change-URI form
+	// github://{host[:port]}/{org}/{repo}/pull/{pr}/{head_sha}
+	// e.g. github://github.com/uber/tango/pull/123/c3a4b5d6e7f80912a3b4c5d6e7f80912a3b4c5d6
+	// whose embedded head SHA pins the exact code state; custom
+	// orchestrators may accept formats of their own. The URL participates
+	// in cache keys as an opaque string.
 	Url string `protobuf:"bytes,1,opt,name=url,proto3" json:"url,omitempty"`
-	// The commit SHA associated with the change request
-	Commit string `protobuf:"bytes,2,opt,name=commit,proto3" json:"commit,omitempty"`
 }
 
 func (m *Request) Reset()      { *m = Request{} }
@@ -219,13 +224,6 @@ func (m *Request) GetUrl() string {
 	return ""
 }
 
-func (m *Request) GetCommit() string {
-	if m != nil {
-		return m.Commit
-	}
-	return ""
-}
-
 // BuildDescription defines a Storage state by a primary revision string and
 // an optional list of change identifiers (e.g., diff IDs or PR IDs).
 type BuildDescription struct {
@@ -234,8 +232,9 @@ type BuildDescription struct {
 	// The base commit sha of the Storage
 	BaseSha string `protobuf:"bytes,2,opt,name=base_sha,json=baseSha,proto3" json:"base_sha,omitempty"`
 	// List of change requests to apply on top of the base revision.
-	// Each request contains a URL (e.g., a GitHub pull request or Phabricator diff URL)
-	// and an required commit SHA. If empty, the computation happens on the base revision.
+	// Each request is identified by a canonical change URI whose embedded
+	// head SHA pins the applied content. If empty, the computation happens
+	// on the base revision.
 	Requests []*Request `protobuf:"bytes,3,rep,name=requests,proto3" json:"requests,omitempty"`
 	// The computation strategy of the original target graph
 	Strategy ComputationStrategy `protobuf:"varint,4,opt,name=strategy,proto3,enum=uber.tango.ComputationStrategy" json:"strategy,omitempty"`
@@ -1330,101 +1329,100 @@ func init() {
 func init() { proto.RegisterFile("tango.proto", fileDescriptor_c4210c857dbeec96) }
 
 var fileDescriptor_c4210c857dbeec96 = []byte{
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+	0x7a, 0x0c, 0x85, 0x78, 0xab, 0x47, 0x57, 0xa2, 0x64, 0x8d, 0x1d, 0x89, 0x15, 0xe5, 0x24, 0x13,
+	0x71, 0x98, 0x94, 0xc4, 0xfb, 0x12, 0x32, 0x60, 0xe6, 0x48, 0x9b, 0x41, 0x57, 0x47, 0x9c, 0xc7,
+	0x76, 0xf5, 0xca, 0xb5, 0x53, 0xac, 0x22, 0x51, 0x1c, 0x3e, 0xb9, 0x8f, 0x9e, 0x6b, 0xb4, 0x7c,
+	0x12, 0x46, 0x6c, 0x43, 0xd7, 0xcf, 0x60, 0x39, 0x8c, 0xb8, 0xf6, 0xf8, 0xc5, 0x2b, 0x39, 0xf1,
+	0xf2, 0x95, 0x9c, 0x78, 0xf3, 0x4a, 0x96, 0xbe, 0x3a, 0x94, 0xa5, 0x1f, 0x0f, 0x65, 0xe9, 0xd7,
+	0x43, 0x59, 0x7a, 0x71, 0x28, 0x4b, 0x7f, 0x1f, 0xca, 0xd2, 0x3f, 0x87, 0x72, 0xe2, 0xcd, 0xa1,
+	0x2c, 0x7d, 0xfb, 0x5a, 0x4e, 0xbc, 0x78, 0x2d, 0x27, 0x5e, 0xbe, 0x96, 0x13, 0x50, 0xd0, 0xed,
+	0x5e, 0x24, 0xce, 0x9a, 0xf8, 0x27, 0x63, 0xdb, 0xb5, 0x99, 0xbd, 0x2d, 0x7d, 0x36, 0xc9, 0x85,
+	0x4e, 0xbb, 0x3d, 0xc1, 0xff, 0xf5, 0xf8, 0xe0, 0xdf, 0x00, 0x00, 0x00, 0xff, 0xff, 0x30, 0x46,
+	0x40, 0xd5, 0x04, 0x11, 0x00, 0x00,
 }
 
 func (x ErrorCode) String() string {
@@ -1497,9 +1495,6 @@ func (this *Request) Equal(that interface{}) bool {
 	if this.Url != that1.Url {
 		return false
 	}
-	if this.Commit != that1.Commit {
-		return false
-	}
 	return true
 }
 func (this *BuildDescription) Equal(that interface{}) bool {
@@ -2171,10 +2166,9 @@ func (this *Request) GoString() string {
 	if this == nil {
 		return "nil"
 	}
-	s := make([]string, 0, 6)
+	s := make([]string, 0, 5)
 	s = append(s, "&tangopb.Request{")
 	s = append(s, "Url: "+fmt.Sprintf("%#v", this.Url)+",\n")
-	s = append(s, "Commit: "+fmt.Sprintf("%#v", this.Commit)+",\n")
 	s = append(s, "}")
 	return strings.Join(s, "")
 }
@@ -2571,13 +2565,6 @@ func (m *Request) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	_ = i
 	var l int
 	_ = l
-	if len(m.Commit) > 0 {
-		i -= len(m.Commit)
-		copy(dAtA[i:], m.Commit)
-		i = encodeVarintTango(dAtA, i, uint64(len(m.Commit)))
-		i--
-		dAtA[i] = 0x12
-	}
 	if len(m.Url) > 0 {
 		i -= len(m.Url)
 		copy(dAtA[i:], m.Url)
@@ -3586,10 +3573,6 @@ func (m *Request) Size() (n int) {
 	if l > 0 {
 		n += 1 + l + sovTango(uint64(l))
 	}
-	l = len(m.Commit)
-	if l > 0 {
-		n += 1 + l + sovTango(uint64(l))
-	}
 	return n
 }
 
@@ -4019,7 +4002,6 @@ func (this *Request) String() string {
 	}
 	s := strings.Join([]string{`&Request{`,
 		`Url:` + fmt.Sprintf("%v", this.Url) + `,`,
-		`Commit:` + fmt.Sprintf("%v", this.Commit) + `,`,
 		`}`,
 	}, "")
 	return s
@@ -4501,38 +4483,6 @@ func (m *Request) Unmarshal(dAtA []byte) error {
 			}
 			m.Url = string(dAtA[iNdEx:postIndex])
 			iNdEx = postIndex
-		case 2:
-			if wireType != 2 {
-				return fmt.Errorf("proto: wrong wireType = %d for field Commit", wireType)
-			}
-			var stringLen uint64
-			for shift := uint(0); ; shift += 7 {
-				if shift >= 64 {
-					return ErrIntOverflowTango
-				}
-				if iNdEx >= l {
-					return io.ErrUnexpectedEOF
-				}
-				b := dAtA[iNdEx]
-				iNdEx++
-				stringLen |= uint64(b&0x7F) << shift
-				if b < 0x80 {
-					break
-				}
-			}
-			intStringLen := int(stringLen)
-			if intStringLen < 0 {
-				return ErrInvalidLengthTango
-			}
-			postIndex := iNdEx + intStringLen
-			if postIndex < 0 {
-				return ErrInvalidLengthTango
-			}
-			if postIndex > l {
-				return io.ErrUnexpectedEOF
-			}
-			m.Commit = string(dAtA[iNdEx:postIndex])
-			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipTango(dAtA[iNdEx:])
diff --git a/tangopb/tango.pb.yarpc.go b/tangopb/tango.pb.yarpc.go
index 43f006fa..3a8d55c8 100644
--- a/tangopb/tango.pb.yarpc.go
+++ b/tangopb/tango.pb.yarpc.go
@@ -463,96 +463,95 @@ var (
 var yarpcFileDescriptorClosurec4210c857dbeec96 = [][]byte{
 	// tango.proto
 	[]byte{
-		0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xec, 0x58, 0x4b, 0x6f, 0xdb, 0xc6,
-		0x16, 0x36, 0x29, 0xc9, 0x96, 0x8e, 0x6c, 0x89, 0x1e, 0x3b, 0xbe, 0xb2, 0x9c, 0x87, 0x43, 0x24,
-		0xb8, 0x4e, 0x2e, 0xae, 0x73, 0xe1, 0x20, 0xb8, 0x69, 0x8a, 0x2c, 0x64, 0x89, 0xb1, 0x85, 0x38,
-		0xb2, 0x3b, 0xa6, 0x53, 0xa4, 0x2d, 0x40, 0x8c, 0xc8, 0x89, 0x4c, 0x54, 0x7c, 0x94, 0x1c, 0x25,
-		0x56, 0xfe, 0x41, 0x37, 0x5d, 0x77, 0xd5, 0x45, 0xff, 0x42, 0xb7, 0xdd, 0x74, 0xd9, 0x45, 0x17,
-		0x45, 0xb7, 0xfd, 0x31, 0x05, 0x67, 0x28, 0x8a, 0x94, 0xe4, 0x17, 0xb2, 0xe9, 0xa2, 0xbb, 0x99,
-		0xf3, 0xf8, 0xce, 0x99, 0xf3, 0xcd, 0xcc, 0x19, 0x12, 0xca, 0x8c, 0xb8, 0x3d, 0x6f, 0xdb, 0x0f,
-		0x3c, 0xe6, 0x21, 0x18, 0x74, 0x69, 0xb0, 0xcd, 0x25, 0xea, 0x67, 0x00, 0x7a, 0x34, 0xd0, 0x82,
-		0xc0, 0x0b, 0xd0, 0x03, 0xc8, 0x9b, 0x9e, 0x45, 0x6b, 0xd2, 0xa6, 0xb4, 0x55, 0xd9, 0xb9, 0xb1,
-		0x3d, 0x36, 0xdc, 0xe6, 0x06, 0x4d, 0xcf, 0xa2, 0x98, 0x9b, 0xa0, 0x1a, 0x2c, 0x38, 0x34, 0x0c,
-		0x49, 0x8f, 0xd6, 0xe4, 0x4d, 0x69, 0xab, 0x84, 0x47, 0x53, 0xf5, 0x31, 0x2c, 0x60, 0xfa, 0xcd,
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 }