diff --git a/specs/port/trinity/src/tri/faculty_types.t27 b/specs/port/trinity/src/tri/faculty_types.t27
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+++ b/specs/port/trinity/src/tri/faculty_types.t27
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+module port::trinity::faculty_types;
+
+// Port of gHashTag/trinity:src/tri/faculty_types.zig (at ee512359254b,
+// ~170 lines) - t27 issue #10005, Roadmap Stage 5 (goal #4547), target
+// t27c gen-rust. The faculty board's shared types file the A2A dashboard
+// reads; the one listed function is the snapshot's active-faculty count.
+// The original's FacultySnapshot carries agents: [6]AgentState - an array
+// of structs this language's Verilog lowering does not implement (W469),
+// and the name FacultySnapshot is already defined by
+// specs/tri/agent/faculty_board.t27, so the port's snapshot is named
+// TrinityFacultySnapshot and carries the six agents' statuses as a
+// scalar array of status codes. The enum status set (up, down, stub,
+// tbd) arrives as those codes; the labels, colors and emoji of the
+// original's enums are the caller's presentation.
+
+// The status codes of the original's AgentStatus enum.
+pub const FACULTY_STATUS_UP: u8 = 0;
+pub const FACULTY_STATUS_DOWN: u8 = 1;
+pub const FACULTY_STATUS_STUB: u8 = 2;
+pub const FACULTY_STATUS_TBD: u8 = 3;
+
+// The faculty is fixed at six agents (ralph, scholar, mu, oracle, swarm,
+// linter - original lines 10-16).
+pub const FACULTY_AGENT_COUNT: usize = 6;
+
+// The snapshot the dashboard reads: one status code per faculty seat.
+pub struct TrinityFacultySnapshot {
+    statuses: [6]u8,
+}
+
+// Line 123, written per the issue as FacultySnapshot_activeFaculty: the
+// active faculty is the count of seats whose status is up.
+pub fn FacultySnapshot_activeFaculty(s: TrinityFacultySnapshot) -> u8 {
+    var count: u8 = 0;
+    var i: usize = 0;
+    while (i < s.statuses.len) {
+        if (s.statuses[i] == FACULTY_STATUS_UP) {
+            count += 1;
+        }
+        i += 1;
+    }
+    return count;
+}
+
+test all_six_up_counts_six {
+    const all = TrinityFacultySnapshot { statuses: [0, 0, 0, 0, 0, 0] };
+    assert(FacultySnapshot_activeFaculty(all) == 6);
+}
+
+test none_up_counts_zero {
+    const none = TrinityFacultySnapshot { statuses: [1, 2, 3, 1, 2, 3] };
+    assert(FacultySnapshot_activeFaculty(none) == 0);
+    const down = TrinityFacultySnapshot { statuses: [1, 1, 1, 1, 1, 1] };
+    assert(FacultySnapshot_activeFaculty(down) == 0);
+}
+
+test mixed_statuses_count_exactly {
+    const three = TrinityFacultySnapshot { statuses: [0, 1, 0, 2, 0, 3] };
+    assert(FacultySnapshot_activeFaculty(three) == 3);
+    const one = TrinityFacultySnapshot { statuses: [1, 2, 3, 3, 2, 0] };
+    assert(FacultySnapshot_activeFaculty(one) == 1);
+    const five = TrinityFacultySnapshot { statuses: [0, 0, 3, 0, 0, 0] };
+    assert(FacultySnapshot_activeFaculty(five) == 5);
+}