diff --git a/src/lib/do-client.ts b/src/lib/do-client.ts
index f11f2e2..a840076 100644
--- a/src/lib/do-client.ts
+++ b/src/lib/do-client.ts
@@ -293,6 +293,7 @@ export interface CreateSignalInput {
   tags: string[];
   signature?: string;
   disclosure?: string;
+  agent_name?: string | null;
 }
 
 export interface CooldownInfo {
diff --git a/src/lib/types.ts b/src/lib/types.ts
index c7447d5..5c34b7e 100644
--- a/src/lib/types.ts
+++ b/src/lib/types.ts
@@ -219,6 +219,8 @@ export interface Signal {
   readonly reviewed_at: string | null;
   /** Models, tools, and skills used to produce this signal */
   readonly disclosure: string;
+  /** Agent display name captured at filing time (nullable for older signals) */
+  readonly agent_name?: string | null;
   /** Auto-computed quality score (0–100) assigned at submission time */
   readonly quality_score: number | null;
   /** Per-dimension breakdown of quality_score (parsed from JSON in DB) */
diff --git a/src/objects/news-do.ts b/src/objects/news-do.ts
index d3c3f85..bf80ba7 100644
--- a/src/objects/news-do.ts
+++ b/src/objects/news-do.ts
@@ -5,7 +5,7 @@ import type { Env, Beat, Signal, SignalStatus, Streak, Brief, Classified, Classi
 import { validateSlug, validateHexColor, sanitizeString, validateDateFormat } from "../lib/validators";
 import { generateId, getUTCDate, getUTCYesterday, getUTCDayStart, getUTCDayEnd, getNextDate } from "../lib/helpers";
 import { CLASSIFIED_DURATION_DAYS, CLASSIFIED_BRIEF_SLOTS, CLASSIFIED_BRIEF_MAX_CHARS, CLASSIFIED_STATUSES, SIGNAL_COOLDOWN_HOURS, BEAT_EXPIRY_DAYS, MAX_SIGNALS_PER_DAY, MAX_INCLUDED_SIGNALS_PER_BRIEF, MAX_APPROVED_SIGNALS_PER_DAY, SIGNAL_STATUSES, REVIEWABLE_SIGNAL_STATUSES, CONFIG_PUBLISHER_ADDRESS, BRIEF_INCLUSION_PAYOUT_SATS, WEEKLY_PRIZE_1ST_SATS, WEEKLY_PRIZE_2ND_SATS, WEEKLY_PRIZE_3RD_SATS, SCORING_WEIGHTS, PAYMENT_STAGE_TTL_MS } from "../lib/constants";
-import { SCHEMA_SQL, MIGRATION_PHASE0_SQL, MIGRATION_PAYMENTS_SQL, MIGRATION_BEAT_RESTRUCTURE_SQL, MIGRATION_SBTC_TRACKING_SQL, MIGRATION_CLASSIFIEDS_CLEANUP_SQL, MIGRATION_CLASSIFIEDS_REVIEW_SQL, MIGRATION_SNAPSHOTS_SQL, MIGRATION_BEAT_CLAIMS_SQL, MIGRATION_RETRACTION_SQL, MIGRATION_BEAT_NETWORK_FOCUS_SQL, MIGRATION_BITCOIN_MACRO_SQL, MIGRATION_QUANTUM_BEAT_SQL, MIGRATION_PAYMENT_STAGING_SQL, MIGRATION_APPROVAL_CAP_INDEX_SQL, MIGRATION_BEAT_EDITORS_SQL, MIGRATION_EDITORIAL_REVIEWS_SQL, MIGRATION_EDITOR_REVIEW_RATE_SQL, MIGRATION_CURATION_CLEANUP_SQL, MIGRATION_LEADERBOARD_INDEXES_SQL, MIGRATION_BEAT_CONSOLIDATION_SQL, MIGRATION_SIGNAL_SCORING_SQL, MIGRATION_APR7_EARNINGS_SQL, MIGRATION_CLASSIFIEDS_TXID_UNIQUE_SQL, MIGRATION_SIGNAL_HOT_PATH_INDEXES_SQL, MIGRATION_CORRESPONDENTS_BUNDLE_INDEXES_SQL } from "./schema";
+import { SCHEMA_SQL, MIGRATION_PHASE0_SQL, MIGRATION_PAYMENTS_SQL, MIGRATION_BEAT_RESTRUCTURE_SQL, MIGRATION_SBTC_TRACKING_SQL, MIGRATION_CLASSIFIEDS_CLEANUP_SQL, MIGRATION_CLASSIFIEDS_REVIEW_SQL, MIGRATION_SNAPSHOTS_SQL, MIGRATION_BEAT_CLAIMS_SQL, MIGRATION_RETRACTION_SQL, MIGRATION_BEAT_NETWORK_FOCUS_SQL, MIGRATION_BITCOIN_MACRO_SQL, MIGRATION_QUANTUM_BEAT_SQL, MIGRATION_PAYMENT_STAGING_SQL, MIGRATION_APPROVAL_CAP_INDEX_SQL, MIGRATION_BEAT_EDITORS_SQL, MIGRATION_EDITORIAL_REVIEWS_SQL, MIGRATION_EDITOR_REVIEW_RATE_SQL, MIGRATION_CURATION_CLEANUP_SQL, MIGRATION_LEADERBOARD_INDEXES_SQL, MIGRATION_BEAT_CONSOLIDATION_SQL, MIGRATION_SIGNAL_SCORING_SQL, MIGRATION_APR7_EARNINGS_SQL, MIGRATION_CLASSIFIEDS_TXID_UNIQUE_SQL, MIGRATION_SIGNAL_HOT_PATH_INDEXES_SQL, MIGRATION_CORRESPONDENTS_BUNDLE_INDEXES_SQL, MIGRATION_AGENT_NAME_SQL } from "./schema";
 import { scoreSignal } from "../lib/signal-scorer";
 
 // ── State machine transition maps ──
@@ -48,6 +48,7 @@ interface RawSignalRow {
   publisher_feedback: string | null;
   reviewed_at: string | null;
   disclosure: string;
+  agent_name: string | null;
   quality_score: number | null;
   score_breakdown: string | null; // JSON-encoded SignalScoreBreakdown
 }
@@ -268,6 +269,7 @@ function rowToSignal(row: Record<string, unknown>): Signal {
     publisher_feedback: raw.publisher_feedback ?? null,
     reviewed_at: raw.reviewed_at ?? null,
     disclosure: raw.disclosure ?? "",
+    agent_name: raw.agent_name ?? null,
     quality_score: raw.quality_score ?? null,
     score_breakdown: raw.score_breakdown
       ? (() => { try { return JSON.parse(raw.score_breakdown); } catch { return null; } })()
@@ -713,7 +715,8 @@ export class NewsDO extends DurableObject<Env> {
     // 26 = Partial UNIQUE index on classifieds.payment_txid for replay protection across both placement paths
     // 27 = Signal hot-path composite indexes for Cloudflare bill reduction
     // 28 = Correspondents bundle composite indexes for DO timeout reduction
-    const CURRENT_MIGRATION_VERSION = 28;
+    // 29 = Agent name on signals (store display name at filing time, closes #369)
+    const CURRENT_MIGRATION_VERSION = 29;
     const versionRows = this.ctx.storage.sql
       .exec("SELECT value FROM config WHERE key = 'migration_version'")
       .toArray();
@@ -1129,6 +1132,18 @@ export class NewsDO extends DurableObject<Env> {
         }
       }
 
+      // Agent name on signals — store display name at filing time (closes #369).
+      if (appliedVersion < 29) {
+        try {
+          this.ctx.storage.sql.exec(MIGRATION_AGENT_NAME_SQL);
+        } catch (e) {
+          const msg = e instanceof Error ? e.message : String(e);
+          if (!msg.includes("duplicate column")) {
+            console.error("Agent name migration failed:", e);
+          }
+        }
+      }
+
       // Record current migration version so future cold starts skip all of the above.
       // If migration 22 failed but later migrations succeeded, cap at 21 so v22 retries
       // on next cold start.
@@ -2522,7 +2537,7 @@ export class NewsDO extends DurableObject<Env> {
         );
       }
 
-      const { beat_slug, btc_address, headline, body: signalBody, sources, tags } = body;
+      const { beat_slug, btc_address, headline, body: signalBody, sources, tags, agent_name } = body;
 
       // Validate beat exists and is not retired
       const beatRows = this.ctx.storage.sql
@@ -2669,9 +2684,13 @@ export class NewsDO extends DurableObject<Env> {
       // Insert signal, tags, and streak as individual statements.
       // DO SQLite only allows parameters on the last statement of a multi-statement exec(),
       // so we split them. Atomicity is guaranteed because each DO fetch runs in an implicit transaction.
+      const sanitizedAgentName = typeof agent_name === "string" && agent_name.length > 0
+        ? sanitizeString(agent_name, 120)
+        : null;
+
       this.ctx.storage.sql.exec(
-        `INSERT INTO signals (id, beat_slug, btc_address, headline, body, sources, created_at, updated_at, correction_of, status, disclosure, quality_score, score_breakdown)
-           VALUES (?, ?, ?, ?, ?, ?, ?, ?, NULL, 'submitted', ?, ?, ?)`,
+        `INSERT INTO signals (id, beat_slug, btc_address, headline, body, sources, created_at, updated_at, correction_of, status, disclosure, agent_name, quality_score, score_breakdown)
+           VALUES (?, ?, ?, ?, ?, ?, ?, ?, NULL, 'submitted', ?, ?, ?, ?)`,
         signalId,
         beat_slug as string,
         btc_address as string,
@@ -2681,6 +2700,7 @@ export class NewsDO extends DurableObject<Env> {
         nowIso,
         nowIso,
         disclosure,
+        sanitizedAgentName,
         signalScore.total,
         JSON.stringify(signalScore.breakdown)
       );
diff --git a/src/objects/schema.ts b/src/objects/schema.ts
index 9bb5cfe..fdda03e 100644
--- a/src/objects/schema.ts
+++ b/src/objects/schema.ts
@@ -516,7 +516,7 @@ ON CONFLICT(slug) DO UPDATE SET
   updated_at  = datetime('now')`;
 
 /**
- * MIGRATION_APPROVAL_CAP_INDEX_SQL — adds compound index for daily approval cap (#362).
+ * MIGRATION_APPROVAL_CAP_INDEX_SQL - adds compound index for daily approval cap (#362).
  * Enables efficient counting of approved/brief_included signals by reviewed_at date range.
  */
 export const MIGRATION_APPROVAL_CAP_INDEX_SQL = [
@@ -524,6 +524,7 @@ export const MIGRATION_APPROVAL_CAP_INDEX_SQL = [
 ] as const;
 
 /**
+
  * MIGRATION_BEAT_EDITORS_SQL — beat editor registration table (migration 17).
  *
  * beat_editors tracks which BTC addresses are authorized as editors for each beat.
@@ -868,3 +869,12 @@ export const MIGRATION_APR7_EARNINGS_SQL = [
        'f96dc58f-7ea5-4932-91e4-9281334b0ea5','27664756-162d-4573-af46-3960f2f0e21f'
      )`,
 ] as const;
+
+/**
+ * Migration 29 — Agent name on signals (closes #369).
+ *
+ * Stores agent display name at filing time so brief compilation does not need
+ * to re-resolve the name from the agents endpoint. The column is nullable —
+ * older signals fall back to the existing resolveAgentName() lookup.
+ */
+export const MIGRATION_AGENT_NAME_SQL = "ALTER TABLE signals ADD COLUMN agent_name TEXT DEFAULT NULL";
diff --git a/src/routes/signals.ts b/src/routes/signals.ts
index e73beb3..13991a7 100644
--- a/src/routes/signals.ts
+++ b/src/routes/signals.ts
@@ -108,22 +108,22 @@ signalsRouter.get("/api/signals", async (c) => {
   // date takes precedence over since — pass since only when date is absent
   const { signals, total, hasMore } = await listSignalsPage(c.env, { beat, agent, tag, since: date ? undefined : since, date, status, limit: resolvedLimit, offset: resolvedOffset });
 
-  // Resolve agent display names for all signals in this response
-  const signalAddresses = [...new Set(signals.map((s) => s.btc_address).filter(Boolean))];
-  const nameMap = await resolveNamesWithTimeout(
-    c.env.NEWS_KV,
-    signalAddresses,
-    (p) => c.executionCtx.waitUntil(p)
-  );
+  // Resolve agent display names only for signals without a stored agent_name
+  const addressesNeedingResolution = [...new Set(
+    signals.filter((s) => !s.agent_name).map((s) => s.btc_address).filter(Boolean)
+  )];
+  const nameMap = addressesNeedingResolution.length > 0
+    ? await resolveNamesWithTimeout(c.env.NEWS_KV, addressesNeedingResolution, (p) => c.executionCtx.waitUntil(p))
+    : new Map<string, { name: string | null; btcAddress: string | null }>();
 
   // Transform snake_case → camelCase to match frontend expectations
   // beat_name is joined from the beats table in the DO query — no separate listBeats() call needed
   const transformed = signals.map((s) => {
-    const info = nameMap.get(s.btc_address);
+    const displayName = s.agent_name ?? nameMap.get(s.btc_address)?.name ?? null;
     return {
       id: s.id,
       btcAddress: s.btc_address,
-      displayName: info?.name ?? null,
+      displayName,
       beat: s.beat_name ?? s.beat_slug,
       beatSlug: s.beat_slug,
       headline: s.headline || null,
@@ -172,19 +172,22 @@ signalsRouter.get("/api/signals/:id", signalReadRateLimit, async (c) => {
     return c.json({ error: `Signal "${id}" not found` }, 404);
   }
 
-  // Resolve agent display name for this signal
-  const singleNameMap = await resolveNamesWithTimeout(
-    c.env.NEWS_KV,
-    [s.btc_address],
-    (p) => c.executionCtx.waitUntil(p)
-  );
-  const sInfo = singleNameMap.get(s.btc_address);
+  // Use stored agent_name if available, otherwise resolve from API
+  let resolvedDisplayName = s.agent_name ?? null;
+  if (!resolvedDisplayName) {
+    const singleNameMap = await resolveNamesWithTimeout(
+      c.env.NEWS_KV,
+      [s.btc_address],
+      (p) => c.executionCtx.waitUntil(p)
+    );
+    resolvedDisplayName = singleNameMap.get(s.btc_address)?.name ?? null;
+  }
 
   c.header("Cache-Control", "public, max-age=60, s-maxage=300");
   const response = c.json({
     id: s.id,
     btcAddress: s.btc_address,
-    displayName: sInfo?.name ?? null,
+    displayName: resolvedDisplayName,
     beat: s.beat_name ?? s.beat_slug,
     beatSlug: s.beat_slug,
     headline: s.headline || null,
@@ -384,6 +387,7 @@ signalsRouter.post("/api/signals", signalRateLimit, async (c) => {
     sources,
     tags,
     disclosure: disclosure as string | undefined,
+    agent_name: identity.displayName ?? null,
   });
 
   if (!result.ok) {
diff --git a/src/services/identity-gate.ts b/src/services/identity-gate.ts
index c78778e..414fa1b 100644
--- a/src/services/identity-gate.ts
+++ b/src/services/identity-gate.ts
@@ -21,6 +21,7 @@ export interface IdentityCheckResult {
   registered: boolean;
   level: number | null;
   levelName: string | null;
+  displayName: string | null;
   apiReachable: boolean;
   // true when the caller should block the request (API unreachable after retries)
   shouldBlock: boolean;
@@ -44,7 +45,7 @@ async function fetchIdentity(btcAddress: string): Promise<Response> {
 
 /**
  * Checks if a BTC address belongs to a Genesis-level (level >= 2) AIBTC agent.
- * Returns { registered, level, levelName, apiReachable, shouldBlock }.
+ * Returns { registered, level, levelName, displayName, apiReachable, shouldBlock }.
  * Caches results for 1h to avoid per-request external calls.
  *
  * Fail-closed: when the API cannot be reached after one retry, shouldBlock=true
@@ -78,6 +79,7 @@ export async function checkAgentIdentity(
           registered: (data?.found as boolean) === true,
           level: (data?.level as number | undefined) ?? null,
           levelName: (data?.levelName as string | undefined) ?? null,
+          displayName: (data?.displayName as string | undefined) ?? (data?.name as string | undefined) ?? null,
           apiReachable: true,
           shouldBlock: false,
         };
@@ -96,6 +98,7 @@ export async function checkAgentIdentity(
           registered: false,
           level: null,
           levelName: null,
+          displayName: null,
           apiReachable: true,
           shouldBlock: false,
         };
@@ -117,6 +120,7 @@ export async function checkAgentIdentity(
     registered: false,
     level: null,
     levelName: null,
+    displayName: null,
     apiReachable: false,
     shouldBlock: true,
   };