feat: agent-hermes reads real token counts from session DB

- Add inputTokens/outputTokens to HermesSessionJson type
- Query input_tokens, output_tokens from sessions table in loadHermesSessionFromDb
- Update test fixture schema with token columns
- runPrompt now reports real token counts from Hermes state.db

Refs #76, #68

packages/agent-hermes/__tests__/session-detail.test.ts

@@ -140,7 +140,9 @@ function createTestDb(dbPath: string): TestDb {
   db.exec(`CREATE TABLE sessions (
     id TEXT PRIMARY KEY,
     model TEXT NOT NULL,
-    started_at INTEGER NOT NULL
+    started_at INTEGER NOT NULL,
+    input_tokens INTEGER DEFAULT 0,
+    output_tokens INTEGER DEFAULT 0
   )`);
   db.exec(`CREATE TABLE messages (
     id INTEGER PRIMARY KEY AUTOINCREMENT,

packages/agent-hermes/src/hermes.ts

@@ -127,8 +127,8 @@ export function createHermesAgent(resumeDisabled: boolean): () => Promise<void>
 
     const usage: Usage = {
       turns,
-      inputTokens: 0,
+      inputTokens: session !== null ? session.inputTokens : 0,
-      outputTokens: 0,
+      outputTokens: session !== null ? session.outputTokens : 0,
       duration: Math.round(durationSec),
     };
 

packages/agent-hermes/src/session-detail.ts

@@ -106,7 +106,7 @@ function parseSessionJson(raw: unknown): HermesSessionJson | null {
       messages.push(msg);
     }
   }
-  return { session_id, model, session_start, messages };
+  return { session_id, model, session_start, messages, inputTokens: 0, outputTokens: 0 };
 }
 
 export function getHermesDbPath(): string {
@@ -117,6 +117,8 @@ type DbSessionRow = {
   id: string;
   model: string;
   started_at: number;
+  input_tokens: number;
+  output_tokens: number;
 };
 
 type DbMessageRow = {
@@ -156,7 +158,9 @@ export function loadHermesSessionFromDb(
   try {
     db = new DatabaseSync(resolvedPath, { readOnly: true });
     const session = db
-      .prepare("SELECT id, model, started_at FROM sessions WHERE id = ?")
+      .prepare(
+        "SELECT id, model, started_at, input_tokens, output_tokens FROM sessions WHERE id = ?",
+      )
       .get(sessionId) as DbSessionRow | null;
     if (session === null) {
       return null;
@@ -181,6 +185,8 @@ export function loadHermesSessionFromDb(
       model: session.model,
       session_start: new Date(session.started_at * 1000).toISOString(),
       messages,
+      inputTokens: session.input_tokens ?? 0,
+      outputTokens: session.output_tokens ?? 0,
     };
   } catch {
     return null;

packages/agent-hermes/src/types.ts

@@ -40,4 +40,6 @@ export type HermesSessionJson = {
   model: string;
   session_start: string;
   messages: HermesSessionMessage[];
+  inputTokens: number;
+  outputTokens: number;
 };