feat(config): add configurable compaction threshold (#18)

* feat(config): add configurable compaction threshold

Add compactionThreshold config option (default 0.80) to control when
context compaction triggers. Previously hardcoded at 80%, now users
can adjust via supermemory.jsonc.

- Add compactionThreshold to SupermemoryConfig interface
- Add default value 0.80 in DEFAULTS
- Export compactionThreshold in CONFIG
- Pass threshold to createCompactionHook
- Update README with config documentation

* fix(config): validate compactionThreshold to ensure 0-1 range

Prevents silent failures when users enter invalid values like 80 instead
of 0.80, which would disable compaction and risk context overflow.

---------

Co-authored-by: Sanyue <sanyue@ciallo.cafe>

Author: Sanyue0v0

README.md

@@ -219,7 +219,10 @@ Create `~/.config/opencode/supermemory.jsonc`:
   "containerTagPrefix": "opencode",
 
   // Extra keyword patterns for memory detection (regex)
-  "keywordPatterns": ["log\\s+this", "write\\s+down"]
+  "keywordPatterns": ["log\\s+this", "write\\s+down"],
+  
+  // Context usage ratio that triggers compaction (0-1)
+  "compactionThreshold": 0.80
 }
 ```
 

src/config.ts

@@ -19,6 +19,7 @@ interface SupermemoryConfig {
   containerTagPrefix?: string;
   filterPrompt?: string;
   keywordPatterns?: string[];
+  compactionThreshold?: number;
 }
 
 const DEFAULT_KEYWORD_PATTERNS = [
@@ -49,6 +50,7 @@ const DEFAULTS: Required<Omit<SupermemoryConfig, "apiKey">> = {
   containerTagPrefix: "opencode",
   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,
 };
 
 function isValidRegex(pattern: string): boolean {
@@ -60,6 +62,14 @@ function isValidRegex(pattern: string): boolean {
   }
 }
 
+function validateCompactionThreshold(value: number | undefined): number {
+  if (value === undefined || typeof value !== 'number' || isNaN(value)) {
+    return DEFAULTS.compactionThreshold;
+  }
+  if (value <= 0 || value > 1) return DEFAULTS.compactionThreshold;
+  return value;
+}
+
 function loadConfig(): SupermemoryConfig {
   for (const path of CONFIG_FILES) {
     if (existsSync(path)) {
@@ -91,6 +101,7 @@ export const CONFIG = {
     ...DEFAULT_KEYWORD_PATTERNS,
     ...(fileConfig.keywordPatterns ?? []).filter(isValidRegex),
   ],
+  compactionThreshold: validateCompactionThreshold(fileConfig.compactionThreshold),
 };
 
 export function isConfigured(): boolean {

src/index.ts

@@ -47,7 +47,9 @@ export const SupermemoryPlugin: Plugin = async (ctx: PluginInput) => {
   }
 
   const compactionHook = isConfigured() && ctx.client
-    ? createCompactionHook(ctx as CompactionContext, tags)
+    ? createCompactionHook(ctx as CompactionContext, tags, {
+        threshold: CONFIG.compactionThreshold,
+      })
     : null;
 
   return {