fix: surface project context in system prompt for connection discovery

packages/opencode/src/altimate/fingerprint/index.ts

@@ -6,6 +6,12 @@ import path from "path"
 
 const log = Log.create({ service: "fingerprint" })
 
+/** Canonical list of warehouse adapter identifiers, shared with system prompt builder. */
+export const ADAPTER_TAGS = [
+  "snowflake", "bigquery", "redshift", "databricks", "postgres",
+  "mysql", "sqlite", "duckdb", "trino", "spark", "clickhouse",
+] as const
+
 export namespace Fingerprint {
   export interface Result {
     tags: string[]
@@ -102,7 +108,7 @@ export namespace Fingerprint {
       try {
         const content = await Filesystem.readText(path.join(dir, "profiles.yml"))
         const adapterMatch = content.match(
-          /type:\s*(snowflake|bigquery|redshift|databricks|postgres|mysql|sqlite|duckdb|trino|spark|clickhouse)/i,
+          new RegExp(`type:\\s*(${ADAPTER_TAGS.join("|")})`, "i"),
         )
         if (adapterMatch) {
           tags.push(adapterMatch[1]!.toLowerCase())

packages/opencode/src/session/system.ts

@@ -14,7 +14,7 @@ import type { Agent } from "@/agent/agent"
 import { PermissionNext } from "@/permission/next"
 import { Skill } from "@/skill"
 // altimate_change start - import for env-based skill selection
-import { Fingerprint } from "../altimate/fingerprint"
+import { Fingerprint, ADAPTER_TAGS } from "../altimate/fingerprint"
 import { Config } from "../config/config"
 import { selectSkillsWithLLM } from "../altimate/skill-selector"
 // altimate_change end
@@ -36,7 +36,7 @@ export namespace SystemPrompt {
 
   export async function environment(model: Provider.Model) {
     const project = Instance.project
-    return [
+    const parts: string[] = [
       [
         `You are powered by the model named ${model.api.id}. The exact model ID is ${model.providerID}/${model.api.id}`,
         `Here is some useful information about the environment you are running in:`,
@@ -59,6 +59,42 @@ export namespace SystemPrompt {
         `</directories>`,
       ].join("\n"),
     ]
+
+    // altimate_change start - inject project context to guide connection discovery
+    try {
+      // detect() caches per-cwd, so calling it directly is both correct and cheap
+      const fingerprint = await Fingerprint.detect(Instance.directory, Instance.worktree)
+      if (fingerprint.tags.length > 0) {
+        const isDbt = fingerprint.tags.includes("dbt")
+        const detectedAdapter = fingerprint.tags.find(t => (ADAPTER_TAGS as readonly string[]).includes(t))
+
+        parts.push(
+          [
+            `<project-context>`,
+            `  Detected project tags: ${fingerprint.tags.join(", ")}`,
+            ...(isDbt ? [
+              ``,
+              `  This workspace contains a dbt project. When executing SQL queries:`,
+              `  1. Attempt to use the dbt connection first (configured via profiles.yml${detectedAdapter ? `, adapter: ${detectedAdapter}` : ""}).`,
+              `  2. If the dbt connection is unavailable or fails, fall back to a configured warehouse connection.`,
+              `  3. If neither works, ask the user for the credentials needed to connect${detectedAdapter ? ` to ${detectedAdapter}` : ""}.`,
+              `  Do not assume the dbt connection will always succeed — be prepared to ask for credentials.`,
+            ] : [
+              ``,
+              `  No dbt project detected. When SQL execution is needed:`,
+              `  1. Check if a warehouse connection is already configured.`,
+              `  2. If not, ask the user for the connection credentials appropriate to this project${detectedAdapter ? ` (detected: ${detectedAdapter})` : ""}.`,
+            ]),
+            `</project-context>`,
+          ].join("\n"),
+        )
+      }
+    } catch {
+      // fingerprint detection is best-effort — never block session startup
+    }
+    // altimate_change end
+
+    return parts
   }
 
   export async function skills(agent: Agent.Info) {