diff --git a/docs/scratchpads/812-pr-review-comment.md b/docs/scratchpads/812-pr-review-comment.md
index 28ebec14..c98e9bc3 100644
--- a/docs/scratchpads/812-pr-review-comment.md
+++ b/docs/scratchpads/812-pr-review-comment.md
@@ -42,10 +42,15 @@ Make the Gitea `comment` action in `packages/mosaic/framework/tools/git/pr-revie
 ## Risks / blockers
 
 - No active implementation blocker. #789 reached terminal merged state and the coordination hold was lifted.
+- Review round 1 found one portability blocker: the API base reconstructed `https://$host` and discarded configured schemes/path prefixes.
+- Remediation adds host-matched configured Gitea URL resolution from the same credential source as token resolution; both POST and GET preserve the configured scheme and normalized path prefix.
 - REST transport failures, non-201 writes, malformed/missing created IDs, non-200 read-backs, and read-back mismatches all fail closed.
 - Existing approve/request-changes behavior remains covered.
-- Independent exact-head review remains coordinator-owned.
+- Independent exact-head re-review remains coordinator-owned.
 
 ## Final verification evidence
 
-Acceptance criteria re-verified locally after clean rebase. Branch will be force-pushed with lease for coordinator verification; no PR opened.
+- URL-portability regression was RED before remediation at the new `http://git.mosaicstack.dev` case and GREEN afterward.
+- Regression coverage verifies POST and read-back GET for both `http://git.mosaicstack.dev` and `https://git.mosaicstack.dev/gitea/` configuration.
+- Focused shell checks, all git-wrapper harnesses, and full repository test/typecheck/lint/format gates passed after remediation.
+- Branch will be force-pushed with lease for coordinator re-verification; no PR opened.
diff --git a/packages/mosaic/framework/tools/git/detect-platform.sh b/packages/mosaic/framework/tools/git/detect-platform.sh
index 7519f11a..23f05e7a 100755
--- a/packages/mosaic/framework/tools/git/detect-platform.sh
+++ b/packages/mosaic/framework/tools/git/detect-platform.sh
@@ -81,7 +81,14 @@ get_repo_slug() {
 gitea_url_matches_host() {
     local url="${1:-}" host="${2:-}"
     [[ -n "$url" && -n "$host" ]] || return 1
-    [[ "${url%/}" == "https://$host" || "${url%/}" == "http://$host" || "${url%/}" == *"//$host" ]]
+    python3 - "$url" "$host" <<'PY'
+import sys
+from urllib.parse import urlparse
+
+url, host = sys.argv[1:]
+parsed = urlparse(url)
+raise SystemExit(0 if parsed.scheme in {"http", "https"} and parsed.hostname == host else 1)
+PY
 }
 
 get_gitea_service_for_host() {
@@ -377,6 +384,51 @@ get_remote_host() {
     return 1
 }
 
+# Resolve the configured Gitea base URL for a host from the same credential
+# source used by get_gitea_token. The scheme and any deployment path prefix are
+# provider configuration and must not be reconstructed from the git remote.
+get_gitea_url_for_host() {
+    local host="$1" script_dir cred_loader url
+    script_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+    cred_loader="$script_dir/../_lib/credentials.sh"
+
+    if [[ -f "$cred_loader" ]]; then
+        url=$(
+            # shellcheck source=/dev/null
+            source "$cred_loader"
+            unset GITEA_TOKEN GITEA_URL
+            case "$host" in
+                git.mosaicstack.dev) load_credentials gitea-mosaicstack 2>/dev/null ;;
+                git.uscllc.com)      load_credentials gitea-usc 2>/dev/null ;;
+                *)
+                    for svc in gitea-mosaicstack gitea-usc; do
+                        unset GITEA_TOKEN GITEA_URL
+                        load_credentials "$svc" 2>/dev/null || continue
+                        if gitea_url_matches_host "${GITEA_URL:-}" "$host"; then
+                            break
+                        fi
+                        unset GITEA_TOKEN GITEA_URL
+                    done
+                    ;;
+            esac
+            if gitea_url_matches_host "${GITEA_URL:-}" "$host"; then
+                printf '%s' "${GITEA_URL%/}"
+            fi
+        )
+        if [[ -n "$url" ]]; then
+            printf '%s\n' "$url"
+            return 0
+        fi
+    fi
+
+    if gitea_url_matches_host "${GITEA_URL:-}" "$host"; then
+        printf '%s\n' "${GITEA_URL%/}"
+        return 0
+    fi
+
+    return 1
+}
+
 # Resolve a Gitea API token for the given host.
 # Priority: Mosaic credential loader → GITEA_TOKEN env → ~/.git-credentials
 get_gitea_token() {
@@ -403,7 +455,7 @@ get_gitea_token() {
                     for svc in gitea-mosaicstack gitea-usc; do
                         unset GITEA_TOKEN GITEA_URL
                         load_credentials "$svc" 2>/dev/null || continue
-                        if [[ "${GITEA_URL:-}" == "https://$host" || "${GITEA_URL:-}" == "http://$host" || "${GITEA_URL:-}" == *"//$host" ]]; then
+                        if gitea_url_matches_host "${GITEA_URL:-}" "$host"; then
                             matched=true
                             break
                         fi
@@ -423,7 +475,7 @@ get_gitea_token() {
 
     # 2. GITEA_TOKEN env var (only when GITEA_URL, if present, matches the remote host)
     if [[ -n "${GITEA_TOKEN:-}" ]]; then
-        if [[ -z "${GITEA_URL:-}" || "${GITEA_URL:-}" == "https://$host" || "${GITEA_URL:-}" == "http://$host" || "${GITEA_URL:-}" == *"//$host" ]]; then
+        if [[ -z "${GITEA_URL:-}" ]] || gitea_url_matches_host "$GITEA_URL" "$host"; then
             echo "$GITEA_TOKEN"
             return 0
         fi
diff --git a/packages/mosaic/framework/tools/git/pr-review.sh b/packages/mosaic/framework/tools/git/pr-review.sh
index 20a37fbd..2e0f138a 100755
--- a/packages/mosaic/framework/tools/git/pr-review.sh
+++ b/packages/mosaic/framework/tools/git/pr-review.sh
@@ -115,7 +115,11 @@ elif [[ "$PLATFORM" == "gitea" ]]; then
                 echo "Error: Gitea token not found for comment persistence" >&2
                 exit 1
             }
-            api_base="https://$host/api/v1/repos/$repo"
+            configured_url=$(get_gitea_url_for_host "$host") || {
+                echo "Error: Configured Gitea URL not found for comment persistence" >&2
+                exit 1
+            }
+            api_base="${configured_url%/}/api/v1/repos/$repo"
             payload=$(COMMENT_BODY="$COMMENT" python3 -c '
 import json
 import os
diff --git a/packages/mosaic/framework/tools/git/test-pr-review-gitea-comment.sh b/packages/mosaic/framework/tools/git/test-pr-review-gitea-comment.sh
index 8887a065..6515a756 100644
--- a/packages/mosaic/framework/tools/git/test-pr-review-gitea-comment.sh
+++ b/packages/mosaic/framework/tools/git/test-pr-review-gitea-comment.sh
@@ -21,16 +21,24 @@ mkdir -p "$REPO_DIR" "$BIN_DIR"
 git -C "$REPO_DIR" init -q
 git -C "$REPO_DIR" remote add origin https://git.mosaicstack.dev/mosaicstack/stack.git
 
-cat > "$CREDENTIALS_FILE" <<'JSON'
-{
-  "gitea": {
-    "mosaicstack": {
-      "url": "https://git.mosaicstack.dev",
-      "token": "test-only-placeholder"
-    }
-  }
+write_credentials() {
+    local configured_url="$1"
+    CONFIGURED_GITEA_URL="$configured_url" python3 - "$CREDENTIALS_FILE" <<'PY'
+import json
+import os
+import sys
+
+with open(sys.argv[1], "w", encoding="utf-8") as credentials:
+    json.dump({
+        "gitea": {
+            "mosaicstack": {
+                "url": os.environ["CONFIGURED_GITEA_URL"],
+                "token": "test-only-placeholder",
+            }
+        }
+    }, credentials)
+PY
 }
-JSON
 
 cat > "$BIN_DIR/tea" <<'SH'
 #!/usr/bin/env bash
@@ -50,7 +58,7 @@ case "${PR_REVIEW_TEST_MODE:-}" in
     request-changes)
         [[ "$*" == "pr reject 123 --repo mosaicstack/stack --login mosaicstack --comment changes-required" ]] || exit 91
         ;;
-    legacy-fallback|comment-success|write-transport-failure|write-http-failure|readback-failure)
+    legacy-fallback|comment-success|http-success|prefix-success|write-transport-failure|write-http-failure|readback-failure)
         if [[ "$*" == pr\ comment* ]]; then
             # tea v0.11.1 treats the nonexistent subcommand as `tea pr list` and exits 0.
             printf '%s\n' 'INDEX TITLE STATE'
@@ -121,8 +129,8 @@ case "${PR_REVIEW_TEST_MODE:-}" in
     write-http-failure)
         write_response 500 '{"message":"simulated rejection"}'
         ;;
-    comment-success|readback-failure)
-        if [[ "$method" == "POST" && "$url" == "https://git.mosaicstack.dev/api/v1/repos/mosaicstack/stack/issues/123/comments" ]]; then
+    comment-success|http-success|prefix-success|readback-failure)
+        if [[ "$method" == "POST" && "$url" == "$PR_REVIEW_EXPECTED_API_BASE/issues/123/comments" ]]; then
             PR_REVIEW_PAYLOAD="$payload" python3 - <<'PY'
 import json
 import os
@@ -137,7 +145,7 @@ print(json.dumps({"id": 456, "body": os.environ["PR_REVIEW_EXPECTED_BODY"]}))
 PY
 )
             write_response 201 "$response"
-        elif [[ "$method" == "GET" && "$url" == "https://git.mosaicstack.dev/api/v1/repos/mosaicstack/stack/issues/comments/456" ]]; then
+        elif [[ "$method" == "GET" && "$url" == "$PR_REVIEW_EXPECTED_API_BASE/issues/comments/456" ]]; then
             if [[ "$PR_REVIEW_TEST_MODE" == "readback-failure" ]]; then
                 body="different-body"
             else
@@ -150,7 +158,7 @@ import os
 print(json.dumps({
     "id": 456,
     "body": os.environ["PR_REVIEW_BODY"],
-    "issue_url": "https://git.mosaicstack.dev/api/v1/repos/mosaicstack/stack/issues/123",
+    "issue_url": os.environ["PR_REVIEW_EXPECTED_API_BASE"] + "/issues/123",
 }))
 PY
 )
@@ -169,6 +177,9 @@ chmod +x "$BIN_DIR/curl"
 
 run_review() {
     local mode="$1" action="$2" comment="${3:-}"
+    local configured_url="${4:-https://git.mosaicstack.dev}"
+    local expected_api_base="${configured_url%/}/api/v1/repos/mosaicstack/stack"
+    write_credentials "$configured_url"
     : > "$TEA_LOG"
     : > "$CURL_LOG"
     : > "$OUTPUT_FILE"
@@ -180,6 +191,7 @@ run_review() {
         PR_REVIEW_CURL_LOG="$CURL_LOG" \
         PR_REVIEW_TEST_MODE="$mode" \
         PR_REVIEW_EXPECTED_BODY="$comment" \
+        PR_REVIEW_EXPECTED_API_BASE="$expected_api_base" \
         "$SCRIPT_DIR/pr-review.sh" -n 123 -a "$action" ${comment:+-c "$comment"}
     ) > "$OUTPUT_FILE" 2>&1
 }
@@ -217,6 +229,14 @@ if [[ -s "$TEA_LOG" ]]; then
     exit 1
 fi
 
+run_review http-success comment durable-body http://git.mosaicstack.dev
+grep -q '^POST http://git.mosaicstack.dev/api/v1/repos/mosaicstack/stack/issues/123/comments$' "$CURL_LOG"
+grep -q '^GET http://git.mosaicstack.dev/api/v1/repos/mosaicstack/stack/issues/comments/456$' "$CURL_LOG"
+
+run_review prefix-success comment durable-body https://git.mosaicstack.dev/gitea/
+grep -q '^POST https://git.mosaicstack.dev/gitea/api/v1/repos/mosaicstack/stack/issues/123/comments$' "$CURL_LOG"
+grep -q '^GET https://git.mosaicstack.dev/gitea/api/v1/repos/mosaicstack/stack/issues/comments/456$' "$CURL_LOG"
+
 if run_review write-transport-failure comment durable-body; then
     echo "Expected provider transport failure to return nonzero" >&2
     exit 1