diff --git a/packages/mosaic/framework/tools/fleet/README.md b/packages/mosaic/framework/tools/fleet/README.md
index 89a65120..0d781c17 100644
--- a/packages/mosaic/framework/tools/fleet/README.md
+++ b/packages/mosaic/framework/tools/fleet/README.md
@@ -13,11 +13,12 @@ Seat lifecycle tools for a Mosaic fleet. Paths are relative to
 ## Onboarding a seat's credential
 
 ```
-MOSAIC_ADMIN_SEAT=<admin-seat> mint-seat-credential.sh <seat>
+MOSAIC_ADMIN_SEAT=<admin-seat> MOSAIC_SEAT_EMAIL_DOMAIN=<domain> mint-seat-credential.sh <seat>
 ```
 
 - The admin token is read from `$MOSAIC_BRAIN_HOME/fleet/agents/<admin-seat>/secrets/gitea-<instance>-<admin-seat>.token`. It is never printed.
-- Instances default to the map shared with `seat-logins.sh`; `MOSAIC_GITEA_INSTANCES="a b"` limits the set and `MOSAIC_GITEA_URL_<INSTANCE>` overrides a server URL.
+- `MOSAIC_SEAT_EMAIL_DOMAIN` is required (no default): the framework ships no estate-specific domain.
+- Instances default to the map shared with `seat-logins.sh`; `MOSAIC_GITEA_INSTANCES="a b"` limits the set and `MOSAIC_GITEA_URL_<INSTANCE>` overrides a server URL (hyphens in the instance name become underscores in the variable, as in `seat-logins.sh`).
 - The seat slot is written from the mint response: `.token`, `.scopes` (what was granted), `.principal`, each mode 600.
 - `tea` absent is a warning, not a failure: REST-path wrappers work with the token alone.
 - Regression suite: `test-mint-seat-credential.sh` (hermetic, mock curl, no network).
diff --git a/packages/mosaic/framework/tools/fleet/mint-seat-credential.sh b/packages/mosaic/framework/tools/fleet/mint-seat-credential.sh
old mode 100644
new mode 100755
index 1c452346..4bf38e08
--- a/packages/mosaic/framework/tools/fleet/mint-seat-credential.sh
+++ b/packages/mosaic/framework/tools/fleet/mint-seat-credential.sh
@@ -14,6 +14,10 @@
 #   MOSAIC_GITEA_URL_<INSTANCE>     server URL override per instance (same
 #                                   convention as seat-logins.sh).
 #   MOSAIC_SEAT_EMAIL_DOMAIN        domain for the account email (<seat>@<domain>).
+#                                   Required, no default: the framework tree
+#                                   carries no estate-specific domain
+#                                   (framework-PR firewall; the instance host
+#                                   map stays per seat-logins.sh precedent).
 #   MOSAIC_BRAIN_HOME               brain checkout; default ~/.mosaic.
 #
 # Exit codes: 0 minted and projected on every instance; 1 at least one instance
@@ -28,13 +32,43 @@
 #
 # The .scopes file is written from the mint RESPONSE rather than from what was
 # requested, so the record is what was granted rather than what was asked for.
+#
+# SECRETS NEVER TOUCH ARGV (#1343 class, rev-security-01 review 259): the admin
+# token, the generated password, and the minted seat token all pass through
+# 0600 curl --config / --data files — the landed in-tree standard
+# (gitea_write_auth_config in detect-platform.sh). argv is world-readable via
+# /proc/<pid>/cmdline for the life of each request, and a bash -x trace would
+# print every secret otherwise. The staging files are unlinked after each use.
 set -Eeuo pipefail
 
+# Stage secrets into 0600 files; nothing secret reaches argv or a trace.
+# write_auth_config <token>  -> curl --config carrying the Authorization header
+#                               (same shape as gitea_write_auth_config in
+#                               detect-platform.sh, local so this script stays
+#                               standalone under tools/fleet).
+# write_user_config <u> <pw> -> curl --config with `user =` (covers -u).
+# write_body <json>          -> 0600 file for --data @file.
+write_auth_config() {
+  local f; f=$(mktemp "${TMPDIR:-/tmp}/mosaic-mint-auth.XXXXXX") || return 1
+  printf 'header = "Authorization: token %s"\n' "$1" >"$f" || { rm -f "$f"; return 1; }
+  chmod 600 "$f"; printf '%s' "$f"
+}
+write_user_config() {
+  local f; f=$(mktemp "${TMPDIR:-/tmp}/mosaic-mint-user.XXXXXX") || return 1
+  printf 'user = "%s:%s"\n' "$1" "$2" >"$f" || { rm -f "$f"; return 1; }
+  chmod 600 "$f"; printf '%s' "$f"
+}
+write_body() {
+  local f; f=$(mktemp "${TMPDIR:-/tmp}/mosaic-mint-body.XXXXXX") || return 1
+  printf '%s' "$1" >"$f" || { rm -f "$f"; return 1; }
+  chmod 600 "$f"; printf '%s' "$f"
+}
+
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 BRAIN="${MOSAIC_BRAIN_HOME:-$HOME/.mosaic}"
 ADMIN="${MOSAIC_ADMIN_SEAT:-}"
 INSTANCES="${MOSAIC_GITEA_INSTANCES:-}"
-EMAIL_DOMAIN="${MOSAIC_SEAT_EMAIL_DOMAIN:-mosaicstack.dev}"
+EMAIL_DOMAIN="${MOSAIC_SEAT_EMAIL_DOMAIN:-}"
 SEAT=""
 
 usage() { sed -n '2,20p' "${BASH_SOURCE[0]}" >&2; exit 3; }
@@ -53,14 +87,18 @@ done
 [[ "$SEAT" =~ ^[a-z0-9][a-z0-9-]*$ ]] || { echo "mint: bad seat name: $SEAT" >&2; exit 3; }
 [[ -n "$ADMIN" ]] || { echo "mint: no admin seat. Set MOSAIC_ADMIN_SEAT or pass --admin-seat." >&2; exit 3; }
 [[ "$ADMIN" =~ ^[a-z0-9][a-z0-9-]*$ ]] || { echo "mint: bad admin seat name: $ADMIN" >&2; exit 3; }
+[[ -n "$EMAIL_DOMAIN" ]] || { echo "mint: no email domain. Set MOSAIC_SEAT_EMAIL_DOMAIN (the framework ships no estate default)." >&2; exit 3; }
 
-# Instance -> server URL. Same map and override convention as seat-logins.sh.
+# Instance -> server URL. Same map and override convention as seat-logins.sh:
+# hyphens in instance names map to underscores in the override variable
+# (MOSAIC_GITEA_URL_MY-INST is not a valid shell name; MY_INST is).
+url_override_var() { printf 'MOSAIC_GITEA_URL_%s' "$(printf '%s' "$1" | tr '[:lower:]-' '[:upper:]_')"; }
 declare -A INSTANCE_URL=(
   [mosaicstack]="https://git.mosaicstack.dev"
   [usc]="https://git.uscllc.com"
 )
 for inst in "${!INSTANCE_URL[@]}"; do
-  ov="MOSAIC_GITEA_URL_${inst^^}"
+  ov="$(url_override_var "$inst")"
   [[ -n "${!ov:-}" ]] && INSTANCE_URL[$inst]="${!ov}"
 done
 [[ -n "$INSTANCES" ]] || INSTANCES="$(printf '%s\n' "${!INSTANCE_URL[@]}" | sort | tr '\n' ' ')"
@@ -71,31 +109,39 @@ mkdir -p "$D"; chmod 700 "$D"
 
 rc=0
 for KEY in $INSTANCES; do
-  ov="MOSAIC_GITEA_URL_${KEY^^}"
+  ov="$(url_override_var "$KEY")"
   BASE="${INSTANCE_URL[$KEY]:-${!ov:-}}"
   [[ -n "$BASE" ]] || { echo "  $KEY: no URL known for this instance (set $ov), skipped" >&2; rc=1; continue; }
   ADMIN_TOKEN_FILE="$BRAIN/fleet/agents/$ADMIN/secrets/gitea-$KEY-$ADMIN.token"
   [[ -r "$ADMIN_TOKEN_FILE" ]] || { echo "  $KEY: no admin token for seat '$ADMIN' ($ADMIN_TOKEN_FILE), skipped" >&2; rc=1; continue; }
   T="$(cat "$ADMIN_TOKEN_FILE")"
+  AUTH_CFG="$(write_auth_config "$T")"
   PW="$(openssl rand -base64 33 | tr -d '\n/+=' | head -c 32)"
+  USER_CFG="$(write_user_config "$SEAT" "$PW")"
 
-  if curl -sf -o /dev/null -H "Authorization: token $T" "$BASE/api/v1/users/$SEAT"; then
-    curl -s -o /dev/null -X PATCH -H "Authorization: token $T" -H "Content-Type: application/json" \
-      -d "{\"login_name\":\"$SEAT\",\"source_id\":0,\"password\":\"$PW\",\"must_change_password\":false}" \
+  if curl -sf -o /dev/null --config "$AUTH_CFG" "$BASE/api/v1/users/$SEAT"; then
+    BODY="$(write_body "{\"login_name\":\"$SEAT\",\"source_id\":0,\"password\":\"$PW\",\"must_change_password\":false}")"
+    curl -s -o /dev/null -X PATCH -H "Content-Type: application/json" \
+      --config "$AUTH_CFG" --data "@$BODY" \
       "$BASE/api/v1/admin/users/$SEAT"
+    rm -f "$BODY"; BODY=""
     act="reset-pw"
   else
-    curl -s -o /dev/null -X POST -H "Authorization: token $T" -H "Content-Type: application/json" \
-      -d "{\"username\":\"$SEAT\",\"email\":\"$SEAT@$EMAIL_DOMAIN\",\"password\":\"$PW\",\"must_change_password\":false,\"full_name\":\"Mosaic fleet seat $SEAT\"}" \
+    BODY="$(write_body "{\"username\":\"$SEAT\",\"email\":\"$SEAT@$EMAIL_DOMAIN\",\"password\":\"$PW\",\"must_change_password\":false,\"full_name\":\"Mosaic fleet seat $SEAT\"}")"
+    curl -s -o /dev/null -X POST -H "Content-Type: application/json" \
+      --config "$AUTH_CFG" --data "@$BODY" \
       "$BASE/api/v1/admin/users"
+    rm -f "$BODY"; BODY=""
     act="create"
   fi
 
-  tmp="$(mktemp)"
-  code="$(curl -s -o "$tmp" -w '%{http_code}' -X POST -u "$SEAT:$PW" -H "Content-Type: application/json" \
-    -d "{\"name\":\"mosaic-seat\",\"scopes\":$SCOPES}" "$BASE/api/v1/users/$SEAT/tokens")"
+  tmp="$(mktemp)"; chmod 600 "$tmp"
+  MINT_BODY="$(write_body "{\"name\":\"mosaic-seat\",\"scopes\":$SCOPES}")"
+  code="$(curl -s -o "$tmp" -w '%{http_code}' -X POST -H "Content-Type: application/json" \
+    --config "$USER_CFG" --data "@$MINT_BODY" "$BASE/api/v1/users/$SEAT/tokens")"
+  rm -f "$MINT_BODY"; MINT_BODY=""
   if [[ "$code" != "201" ]]; then
-    echo "  $KEY: mint FAILED http=$code ($act)" >&2; rm -f "$tmp"; rc=1; PW=""; continue
+    echo "  $KEY: mint FAILED http=$code ($act)" >&2; rm -f "$tmp"; rc=1; PW=""; rm -f "$AUTH_CFG" "$USER_CFG"; continue
   fi
 
   python3 - "$tmp" "$D" "$KEY" "$SEAT" <<'PY'
@@ -109,10 +155,12 @@ p=pathlib.Path(d)
 for suf in ("token","scopes","principal"):
     (p/f"gitea-{key}-{seat}.{suf}").chmod(0o600)
 PY
-  rm -f "$tmp"; PW=""
+  rm -f "$tmp"; PW=""; rm -f "$AUTH_CFG" "$USER_CFG"
 
-  login="$(curl -s -H "Authorization: token $(cat "$D/gitea-$KEY-$SEAT.token")" "$BASE/api/v1/user" \
+  VERIFY_CFG="$(write_auth_config "$(cat "$D/gitea-$KEY-$SEAT.token")")"
+  login="$(curl -s --config "$VERIFY_CFG" "$BASE/api/v1/user" \
     | python3 -c 'import json,sys;print(json.load(sys.stdin).get("login","ERR"))' 2>/dev/null || echo ERR)"
+  rm -f "$VERIFY_CFG"
   if [[ "$login" == "$SEAT" ]]; then
     echo "  $KEY: $act, minted, GET /user -> $login"
   else
diff --git a/packages/mosaic/framework/tools/fleet/test-mint-seat-credential.sh b/packages/mosaic/framework/tools/fleet/test-mint-seat-credential.sh
index e7a01f1c..97fffce0 100755
--- a/packages/mosaic/framework/tools/fleet/test-mint-seat-credential.sh
+++ b/packages/mosaic/framework/tools/fleet/test-mint-seat-credential.sh
@@ -11,6 +11,17 @@
 #       override MOSAIC_GITEA_URL_<INSTANCE> is honoured.
 #   M4  no admin seat configured is a usage error (rc=3), nothing written.
 #   M5  the admin token value never appears on stdout or stderr.
+#   M6  secrets never touch argv: no Authorization header, no -u user:pass, no
+#       inline --data JSON carrying the password, on any curl invocation; auth
+#       travels in --config files and bodies in --data @files (#1343 class,
+#       rev-security-01 review 259 blocker).
+#   M7  the scopes record discriminates: a requested-but-not-granted scope
+#       (write:issue) must be ABSENT from .scopes — the pin is on the RESPONSE,
+#       and a mutant writing the requested set fails here (both reviewers).
+#   M8  hyphenated instance names resolve their override through the underscore
+#       variable, matching seat-logins.sh (SF3).
+#   M9  MOSAIC_SEAT_EMAIL_DOMAIN is required: unset is a usage error (rc=3),
+#       nothing written (framework-PR firewall answer).
 set -euo pipefail
 
 WORK_ROOT="${AGENT_WORK_ROOT:-${TMPDIR:-/tmp}}"
@@ -38,23 +49,34 @@ done
 export PATH="$MOCK_BIN:$SYS_BIN" CALLS
 export MOSAIC_BRAIN_HOME="$BRAIN"
 export MOSAIC_GITEA_URL_ALPHA="https://alpha.example.test"
+export MOSAIC_SEAT_EMAIL_DOMAIN="seats.example.test"
 unset MOSAIC_ADMIN_SEAT MOSAIC_GITEA_INSTANCES
 
-# --- mock curl: records method + URL, answers the minting sequence -----------
+# --- mock curl: records method + URL + a REDACTED auth marker, answers minting --
 cat > "$MOCK_BIN/curl" <<'EOF'
 #!/bin/bash
-method=GET; url=""; out=""; wcode=0
+method=GET; url=""; out=""; wcode=0; auth=""; body=""
 while [ $# -gt 0 ]; do
     case "$1" in
         -X) method="$2"; shift 2 ;;
         -o) out="$2"; shift 2 ;;
         -w) wcode=1; shift 2 ;;
-        -H|-d|-u) shift 2 ;;
+        --config)
+            if grep -q 'Authorization: token' "$2" 2>/dev/null; then auth="${auth}token,"; fi
+            if grep -q '^user = ' "$2" 2>/dev/null; then auth="${auth}user,"; fi
+            shift 2 ;;
+        --data)
+            case "$2" in
+                @*) body="@file" ;;
+                *)  body="inline" ;;
+            esac
+            shift 2 ;;
+        -H|-u) shift 2 ;;
         http*) url="$1"; shift ;;
         *) shift ;;
     esac
 done
-printf '%s %s\n' "$method" "$url" >> "$CALLS"
+printf '%s %s auth=%s body=%s\n' "$method" "$url" "${auth:-NONE}" "$body" >> "$CALLS"
 emit() { if [ -n "$out" ]; then printf '%s' "$1" > "$out"; else printf '%s' "$1"; fi; }
 case "$method $url" in
     "GET "*/api/v1/users/newseat)        exit 22 ;;   # 404 under -f: account does not exist yet
@@ -77,6 +99,13 @@ rc=$(run newseat)
 grep -q 'MOSAIC_ADMIN_SEAT' "$SANDBOX/err" || fail "M4: error does not name MOSAIC_ADMIN_SEAT"
 [ ! -e "$BRAIN/fleet/agents/newseat/secrets/gitea-alpha-newseat.token" ] || fail "M4: a token was written without an admin seat"
 
+# M9: email domain is required, unset is a usage error, nothing written.
+rc=$(MOSAIC_ADMIN_SEAT=admin-seat MOSAIC_GITEA_INSTANCES=alpha MOSAIC_SEAT_EMAIL_DOMAIN= run newseat)
+[ "$rc" = 3 ] || fail "M9: expected rc=3 with no email domain, got $rc: $(cat "$SANDBOX/err")"
+grep -q 'MOSAIC_SEAT_EMAIL_DOMAIN' "$SANDBOX/err" || fail "M9: error does not name MOSAIC_SEAT_EMAIL_DOMAIN"
+[ ! -s "$CALLS" ] || fail "M9: API called without an email domain"
+[ ! -e "$BRAIN/fleet/agents/newseat/secrets/gitea-alpha-newseat.token" ] || fail "M9: token written without an email domain"
+
 # M1 + M3 + M5: mint on the single configured instance.
 : > "$CALLS"
 rc=$(MOSAIC_ADMIN_SEAT=admin-seat MOSAIC_GITEA_INSTANCES=alpha run newseat)
@@ -92,7 +121,33 @@ grep -q 'alpha: create, minted, GET /user -> newseat' "$SANDBOX/out" || fail "M1
 grep -q 'https://alpha.example.test/api/v1/admin/users' "$CALLS" || fail "M3: URL override not honoured: $(cat "$CALLS")"
 if grep -q 'usc\|mosaicstack' "$CALLS"; then fail "M3: an instance outside MOSAIC_GITEA_INSTANCES was touched: $(cat "$CALLS")"; fi
 grep -q 'tea not on PATH' "$SANDBOX/err" || fail "tea-absent path should warn, not fail: $(cat "$SANDBOX/err")"
-if grep -q "$ADMIN_TOKEN_VALUE" "$SANDBOX/out" "$SANDBOX/err"; then fail "M5: admin token value leaked to output"; fi
+if grep -q "$ADMIN_TOKEN_VALUE" "$SANDBOX/out" "$SANDBOX/err" "$CALLS"; then fail "M5: admin token value leaked to output or call log"; fi
+
+# M7: scopes pin discriminates — requested-but-not-granted scope is ABSENT.
+if grep -q 'write:issue' "$SLOT/gitea-alpha-newseat.scopes"; then
+    fail "M7: write:issue appears in .scopes — the record is the REQUESTED set, not the response"
+fi
+
+# M6: no secret ever travels argv — every call authenticates via --config
+# (token header or user= basic-auth directive) and bodies go as --data @file.
+while IFS= read -r line; do
+    case "$line" in
+        *auth=NONE*)     fail "M6: unauthenticated call: $line" ;;
+        *body=inline*)   fail "M6: inline body (secret in argv risk): $line" ;;
+    esac
+done < "$CALLS"
+[ "$(grep -c 'auth=token' "$CALLS")" -eq 3 ] || fail "M6: expected exactly 3 token-auth calls (exists-check, admin write, verify), got: $(cat "$CALLS")"
+grep -q 'auth=user' "$CALLS" || fail "M6: mint call did not use the user= directive: $(cat "$CALLS")"
+
+# M8: hyphenated instance name resolves its override via the underscore variable.
+printf '%s\n' "$ADMIN_TOKEN_VALUE" > "$BRAIN/fleet/agents/admin-seat/secrets/gitea-my-inst-admin-seat.token"
+chmod 600 "$BRAIN/fleet/agents/admin-seat/secrets/gitea-my-inst-admin-seat.token"
+export MOSAIC_GITEA_URL_MY_INST="https://myinst.example.test"
+: > "$CALLS"; rm -rf "$BRAIN/fleet/agents/newseat"
+rc=$(MOSAIC_ADMIN_SEAT=admin-seat MOSAIC_GITEA_INSTANCES=my-inst run newseat)
+[ "$rc" = 0 ] || fail "M8: hyphenated instance mint failed rc=$rc: $(cat "$SANDBOX/err")"
+grep -q 'https://myinst.example.test/api/v1/admin/users' "$CALLS" || fail "M8: hyphen override (MY_INST) not honoured: $(cat "$CALLS")"
+unset MOSAIC_GITEA_URL_MY_INST
 
 # M2: admin token missing for the instance is reported, rc=1, nothing written.
 rm -rf "$BRAIN/fleet/agents/newseat"