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Fix: use chat.message hook for context injection #3

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Fix: use chat.message hook for context injection #3

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2 changes: 1 addition & 1 deletion README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -120,7 +120,7 @@ Restart OpenCode. The plugin will automatically load.
│ │
│ Hooks: │
│ ┌─────────────────┐ ┌────────────────────┐ │
│ │ chat.params │─────▶│ Context Injection │ │
│ │ chat.message │─────▶│ Context Injection │ │
│ │ (pre-LLM) │ │ - Golden Rules │ │
│ │ │ │ - Past Learnings │ │
│ │ │ │ - Heuristics │ │
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4 changes: 2 additions & 2 deletions package-lock.json
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2 changes: 1 addition & 1 deletion package.json
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Original file line number Diff line number Diff line change
Expand Up @@ -51,7 +51,7 @@
"opencode": {
"type": "plugin",
"hooks": [
"chat.params",
"chat.message",
"event"
]
},
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27 changes: 14 additions & 13 deletions src/index.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -75,18 +75,21 @@ export const ELFPlugin: Plugin = async ({ directory }: PluginInput) => {
// 3. Return hooks immediately
return {
/**
* Chat params hook - Inject ELF context before the LLM processes the message
* Chat message hook - Inject ELF context into system prompt before LLM processing
*/
"chat.params": async (params: Record<string, unknown>) => {
"chat.message": async (input, output) => {
const start = Date.now();

try {
// Wait for init to finish (only affects the very first message)
await ensureReady();

const input = params.input as Record<string, unknown> | undefined;
const message = input?.message as Record<string, unknown> | undefined;
const userMessage = message?.text as string | undefined;
// Extract user text from message parts (TextParts have type "text" and a text field)
const userMessage = output.parts
.filter((p): p is Extract<typeof p, { type: "text" }> => p.type === "text")
.map(p => p.text)
.join("\n")
.trim();

if (!userMessage) return;

Expand All @@ -110,13 +113,11 @@ export const ELFPlugin: Plugin = async ({ directory }: PluginInput) => {
context.relevantLearnings.length > 0 ||
context.heuristics.length > 0) {

// Inject into system prompt or prepend to user message
const systemPrompt = input?.systemPrompt as string | undefined;
if (systemPrompt && input) {
input.systemPrompt = `${systemPrompt}\n\n${elfMemory}`;
} else if (message) {
message.text = `${elfMemory}\n\n${userMessage}`;
}
// Inject into the system prompt via output.message.system
const currentSystem = output.message.system || "";
output.message.system = currentSystem
? `${currentSystem}\n\n${elfMemory}`
: elfMemory;

// Record metrics
const duration = Date.now() - start;
Expand All @@ -129,7 +130,7 @@ export const ELFPlugin: Plugin = async ({ directory }: PluginInput) => {
}
} catch (error) {
// Fail open: If ELF fails, log it but don't break the user's chat
console.error("ELF: Error in chat.params hook", error);
console.error("ELF: Error in chat.message hook", error);
}
},

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