diff --git a/packages/context/src/scan/description-generation.ts b/packages/context/src/scan/description-generation.ts
index ba61fb62..f4ad2d35 100644
--- a/packages/context/src/scan/description-generation.ts
+++ b/packages/context/src/scan/description-generation.ts
@@ -457,7 +457,7 @@ export class KtxDescriptionGenerator {
       }
     }
 
-    const sampleTable = input.connector.sampleTable;
+    const sampleTable = input.connector.sampleTable?.bind(input.connector);
     let sampleData: KtxTableSampleResult | null = null;
     let fallbackReason: 'capability_missing' | 'sampling_failed' | 'empty_sample' | null = null;
 
@@ -678,7 +678,7 @@ export class KtxDescriptionGenerator {
           });
           columnValues = [];
         } else {
-          const sampleColumn = input.connector.sampleColumn;
+          const sampleColumn = input.connector.sampleColumn.bind(input.connector);
           try {
             const sample = await retryAsync(
               () =>
diff --git a/packages/context/src/scan/relationship-profiling.ts b/packages/context/src/scan/relationship-profiling.ts
index fa6acfac..ac1e063e 100644
--- a/packages/context/src/scan/relationship-profiling.ts
+++ b/packages/context/src/scan/relationship-profiling.ts
@@ -214,6 +214,9 @@ function sampleAggregateSql(driver: KtxConnectionDriver, innerSql: string): stri
   if (driver === 'postgres') {
     return `(SELECT STRING_AGG(CAST(value AS TEXT), CHR(31)) FROM (${innerSql}) AS relationship_profile_values)`;
   }
+  if (driver === 'duckdb') {
+    return `(SELECT STRING_AGG(CAST(value AS VARCHAR), CHR(31)) FROM (${innerSql}) AS relationship_profile_values)`;
+  }
   if (driver === 'bigquery') {
     return `(SELECT STRING_AGG(CAST(value AS STRING), '\\u001F') FROM (${innerSql}) AS relationship_profile_values)`;
   }