feat: context re-injection with periodic and keyword triggers

Previously, supermemory context was only injected on the first message
of a session. This meant topic changes mid-session lost relevant
memory context.

Changes:
- Add reinjectEveryN config (default 0 = first only)
  Set to e.g. 10 to re-inject context every 10 messages
- Add recall keyword patterns (English + Japanese)
  'recall', '思い出して', 'メモリ確認' etc. trigger immediate
  context re-injection on that message
- Clean up session state on session.deleted
- Track per-session message counts instead of boolean set

Config example (supermemory.jsonc):
  { "reinjectEveryN": 10 }

Author: kandotrun

src/config.ts

@@ -23,6 +23,10 @@ interface SupermemoryConfig {
   filterPrompt?: string;
   keywordPatterns?: string[];
   compactionThreshold?: number;
+  /** Re-inject context every N messages. 0 = first message only (default). */
+  reinjectEveryN?: number;
+  /** Keywords that trigger immediate context re-injection. */
+  recallKeywordPatterns?: string[];
 }
 
 const DEFAULT_KEYWORD_PATTERNS = [
@@ -57,6 +61,19 @@ const DEFAULT_KEYWORD_PATTERNS = [
   "ノートして",
 ];
 
+const DEFAULT_RECALL_KEYWORD_PATTERNS = [
+  // English
+  "recall",
+  "what\\s+do\\s+you\\s+remember",
+  "check\\s+memory",
+  "search\\s+memory",
+  // Japanese
+  "思い出して",
+  "記憶を?検索",
+  "メモリ[ーを]?確認",
+  "何か覚えてる",
+];
+
 const DEFAULTS: Required<Omit<SupermemoryConfig, "apiKey" | "userContainerTag" | "projectContainerTag">> = {
   similarityThreshold: 0.6,
   maxMemories: 5,
@@ -67,6 +84,8 @@ const DEFAULTS: Required<Omit<SupermemoryConfig, "apiKey" | "userContainerTag" |
   filterPrompt: "You are a stateful coding agent. Remember all the information, including but not limited to user's coding preferences, tech stack, behaviours, workflows, and any other relevant details.",
   keywordPatterns: [],
   compactionThreshold: 0.80,
+  reinjectEveryN: 0,
+  recallKeywordPatterns: [],
 };
 
 function isValidRegex(pattern: string): boolean {
@@ -127,6 +146,11 @@ export const CONFIG = {
     ...(fileConfig.keywordPatterns ?? []).filter(isValidRegex),
   ],
   compactionThreshold: validateCompactionThreshold(fileConfig.compactionThreshold),
+  reinjectEveryN: fileConfig.reinjectEveryN ?? DEFAULTS.reinjectEveryN,
+  recallKeywordPatterns: [
+    ...DEFAULT_RECALL_KEYWORD_PATTERNS,
+    ...(fileConfig.recallKeywordPatterns ?? []).filter(isValidRegex),
+  ],
 };
 
 export function isConfigured(): boolean {

src/index.ts

@@ -17,6 +17,7 @@ const CODE_BLOCK_PATTERN = /```[\s\S]*?```/g;
 const INLINE_CODE_PATTERN = /`[^`]+`/g;
 
 const MEMORY_KEYWORD_PATTERN = new RegExp(`\\b(${CONFIG.keywordPatterns.join("|")})\\b`, "i");
+const RECALL_KEYWORD_PATTERN = new RegExp(`\\b(${CONFIG.recallKeywordPatterns.join("|")})\\b`, "i");
 
 const MEMORY_NUDGE_MESSAGE = `[MEMORY TRIGGER DETECTED]
 The user wants you to remember something. You MUST use the \`supermemory\` tool with \`mode: "add"\` to save this information.
@@ -37,10 +38,15 @@ function detectMemoryKeyword(text: string): boolean {
   return MEMORY_KEYWORD_PATTERN.test(textWithoutCode);
 }
 
+function detectRecallKeyword(text: string): boolean {
+  const textWithoutCode = removeCodeBlocks(text);
+  return RECALL_KEYWORD_PATTERN.test(textWithoutCode);
+}
+
 export const SupermemoryPlugin: Plugin = async (ctx: PluginInput) => {
   const { directory } = ctx;
   const tags = getTags(directory);
-  const injectedSessions = new Set<string>();
+  const sessionMessageCount = new Map<string, number>();
   log("Plugin init", { directory, tags, configured: isConfigured() });
 
   if (!isConfigured()) {
@@ -171,10 +177,20 @@ export const SupermemoryPlugin: Plugin = async (ctx: PluginInput) => {
           output.parts.push(nudgePart);
         }
 
-        const isFirstMessage = !injectedSessions.has(input.sessionID);
+        // Determine whether to inject context
+        const count = (sessionMessageCount.get(input.sessionID) || 0) + 1;
+        sessionMessageCount.set(input.sessionID, count);
+
+        const isFirstMessage = count === 1;
+        const recallTriggered = detectRecallKeyword(userMessage);
+        const periodicReinject = CONFIG.reinjectEveryN > 0 && count % CONFIG.reinjectEveryN === 0;
+        const shouldInjectContext = isFirstMessage || recallTriggered || periodicReinject;
 
-        if (isFirstMessage) {
-          injectedSessions.add(input.sessionID);
+        if (shouldInjectContext) {
+          log("chat.message: injecting context", {
+            reason: isFirstMessage ? "first-message" : recallTriggered ? "recall-keyword" : "periodic",
+            messageCount: count,
+          });
 
           const [profileResult, userMemoriesResult, projectMemoriesListResult] = await Promise.all([
             supermemoryClient.getProfile(tags.user, userMessage),
@@ -220,6 +236,7 @@ export const SupermemoryPlugin: Plugin = async (ctx: PluginInput) => {
             log("chat.message: context injected", {
               duration,
               contextLength: memoryContext.length,
+              reason: isFirstMessage ? "first-message" : recallTriggered ? "recall-keyword" : "periodic",
             });
           }
         }
@@ -540,6 +557,7 @@ export const SupermemoryPlugin: Plugin = async (ctx: PluginInput) => {
         const sessionInfo = props?.info as { id?: string } | undefined;
         if (sessionInfo?.id) {
           await saveSessionSummary(sessionInfo.id);
+          sessionMessageCount.delete(sessionInfo.id);
         }
       }