feat: migrate hook callers to SDK message finders on SQLite backend

src/hooks/atlas/event-handler.ts

@@ -87,7 +87,7 @@ export function createAtlasEventHandler(input: {
         return
       }
 
-      const lastAgent = getLastAgentFromSession(sessionID)
+      const lastAgent = await getLastAgentFromSession(sessionID, ctx.client)
       const requiredAgent = (boulderState.agent ?? "atlas").toLowerCase()
       const lastAgentMatchesRequired = lastAgent === requiredAgent
       const boulderAgentWasNotExplicitlySet = boulderState.agent === undefined

src/hooks/atlas/recent-model-resolver.ts

@@ -1,6 +1,9 @@
 import type { PluginInput } from "@opencode-ai/plugin"
-import { findNearestMessageWithFields } from "../../features/hook-message-injector"
-import { getMessageDir } from "../../shared"
+import {
+  findNearestMessageWithFields,
+  findNearestMessageWithFieldsFromSDK,
+} from "../../features/hook-message-injector"
+import { getMessageDir, isSqliteBackend } from "../../shared"
 import type { ModelInfo } from "./types"
 
 export async function resolveRecentModelForSession(
@@ -28,8 +31,13 @@ export async function resolveRecentModelForSession(
     // ignore - fallback to message storage
   }
 
-  const messageDir = getMessageDir(sessionID)
-  const currentMessage = messageDir ? findNearestMessageWithFields(messageDir) : null
+  let currentMessage = null
+  if (isSqliteBackend()) {
+    currentMessage = await findNearestMessageWithFieldsFromSDK(ctx.client, sessionID)
+  } else {
+    const messageDir = getMessageDir(sessionID)
+    currentMessage = messageDir ? findNearestMessageWithFields(messageDir) : null
+  }
   const model = currentMessage?.model
   if (!model?.providerID || !model?.modelID) {
     return undefined

src/hooks/atlas/session-last-agent.ts

@@ -1,9 +1,24 @@
-import { findNearestMessageWithFields } from "../../features/hook-message-injector"
-import { getMessageDir } from "../../shared"
+import type { PluginInput } from "@opencode-ai/plugin"
+
+import { findNearestMessageWithFields } from "../../features/hook-message-injector"
+import { findNearestMessageWithFieldsFromSDK } from "../../features/hook-message-injector"
+import { getMessageDir, isSqliteBackend } from "../../shared"
+
+type OpencodeClient = PluginInput["client"]
+
+export async function getLastAgentFromSession(
+  sessionID: string,
+  client?: OpencodeClient
+): Promise<string | null> {
+  let nearest = null
+
+  if (isSqliteBackend() && client) {
+    nearest = await findNearestMessageWithFieldsFromSDK(client, sessionID)
+  } else {
+    const messageDir = getMessageDir(sessionID)
+    if (!messageDir) return null
+    nearest = findNearestMessageWithFields(messageDir)
+  }
 
-export function getLastAgentFromSession(sessionID: string): string | null {
-  const messageDir = getMessageDir(sessionID)
-  if (!messageDir) return null
-  const nearest = findNearestMessageWithFields(messageDir)
   return nearest?.agent?.toLowerCase() ?? null
 }

src/hooks/prometheus-md-only/agent-resolution.ts

@@ -1,9 +1,29 @@
+import type { PluginInput } from "@opencode-ai/plugin"
+
 import { findNearestMessageWithFields, findFirstMessageWithAgent } from "../../features/hook-message-injector"
+import {
+  findFirstMessageWithAgentFromSDK,
+  findNearestMessageWithFieldsFromSDK,
+} from "../../features/hook-message-injector"
 import { getSessionAgent } from "../../features/claude-code-session-state"
 import { readBoulderState } from "../../features/boulder-state"
 import { getMessageDir } from "../../shared/opencode-message-dir"
+import { isSqliteBackend } from "../../shared/opencode-storage-detection"
+
+type OpencodeClient = PluginInput["client"]
+
+async function getAgentFromMessageFiles(
+  sessionID: string,
+  client?: OpencodeClient
+): Promise<string | undefined> {
+  if (isSqliteBackend() && client) {
+    const firstAgent = await findFirstMessageWithAgentFromSDK(client, sessionID)
+    if (firstAgent) return firstAgent
+
+    const nearest = await findNearestMessageWithFieldsFromSDK(client, sessionID)
+    return nearest?.agent
+  }
 
-function getAgentFromMessageFiles(sessionID: string): string | undefined {
   const messageDir = getMessageDir(sessionID)
   if (!messageDir) return undefined
   return findFirstMessageWithAgent(messageDir) ?? findNearestMessageWithFields(messageDir)?.agent
@@ -21,7 +41,11 @@ function getAgentFromMessageFiles(sessionID: string): string | undefined {
  * - Message files return "prometheus" (oldest message from /plan)
  * - But boulder.json has agent: "atlas" (set by /start-work)
  */
-export function getAgentFromSession(sessionID: string, directory: string): string | undefined {
+export async function getAgentFromSession(
+  sessionID: string,
+  directory: string,
+  client?: OpencodeClient
+): Promise<string | undefined> {
   // Check in-memory first (current session)
   const memoryAgent = getSessionAgent(sessionID)
   if (memoryAgent) return memoryAgent
@@ -33,5 +57,5 @@ export function getAgentFromSession(sessionID: string, directory: string): strin
   }
 
   // Fallback to message files
-  return getAgentFromMessageFiles(sessionID)
+  return await getAgentFromMessageFiles(sessionID, client)
 }

src/hooks/prometheus-md-only/hook.ts

@@ -15,7 +15,7 @@ export function createPrometheusMdOnlyHook(ctx: PluginInput) {
       input: { tool: string; sessionID: string; callID: string },
       output: { args: Record<string, unknown>; message?: string }
     ): Promise<void> => {
-      const agentName = getAgentFromSession(input.sessionID, ctx.directory)
+      const agentName = await getAgentFromSession(input.sessionID, ctx.directory, ctx.client)
 
       if (!isPrometheusAgent(agentName)) {
         return

src/hooks/todo-continuation-enforcer/continuation-injection.ts

@@ -3,9 +3,11 @@ import type { PluginInput } from "@opencode-ai/plugin"
 import type { BackgroundManager } from "../../features/background-agent"
 import {
   findNearestMessageWithFields,
+  findNearestMessageWithFieldsFromSDK,
   type ToolPermission,
 } from "../../features/hook-message-injector"
 import { log } from "../../shared/logger"
+import { isSqliteBackend } from "../../shared/opencode-storage-detection"
 
 import {
   CONTINUATION_PROMPT,
@@ -78,8 +80,13 @@ export async function injectContinuation(args: {
   let tools = resolvedInfo?.tools
 
   if (!agentName || !model) {
-    const messageDir = getMessageDir(sessionID)
-    const previousMessage = messageDir ? findNearestMessageWithFields(messageDir) : null
+    let previousMessage = null
+    if (isSqliteBackend()) {
+      previousMessage = await findNearestMessageWithFieldsFromSDK(ctx.client, sessionID)
+    } else {
+      const messageDir = getMessageDir(sessionID)
+      previousMessage = messageDir ? findNearestMessageWithFields(messageDir) : null
+    }
     agentName = agentName ?? previousMessage?.agent
     model =
       model ??