diff --git a/packages/gateway/src/routes/completion.ts b/packages/gateway/src/routes/completion.ts
index dea4fdb..9563e91 100644
--- a/packages/gateway/src/routes/completion.ts
+++ b/packages/gateway/src/routes/completion.ts
@@ -147,18 +147,35 @@ export async function completionRoute(fastify: FastifyInstance): Promise<void> {
       // Stage 5: Prompt assembly
       // Use taskType directly for template lookup (so tip_transceiver_enrich.yaml is used,
       // not the generic_qa fallback from routing). The router only selects the model.
-      // Spread context fields so templates can reference {{source_data}}, {{source_url}}, etc.
-      // Fall back to input for {{source_data}} when not explicitly provided in context.
+      //
+      // Variable resolution strategy:
+      // 1. Explicit context fields take priority (callers can pass structured data)
+      // 2. `input` is used as fallback for ALL common content variables so simple
+      //    one-field callers work without knowing each template's specific var name.
       const contextVars = context
         ? Object.fromEntries(Object.entries(context).map(([k, v]) => [k, v as string]))
         : {};
+
+      // Common content variable names across all 59 templates — all default to `input`
+      const inputAliases: Record<string, string> = {
+        source_data: input, ocr_text: input, transcription: input,
+        ticket_content: input, alert_data: input, incident_data: input,
+        lldp_data: input, cve_data: input, inventory: input,
+        anomaly_data: input, flagged_input: input, attack_description: input,
+        bgp_data: input, health_checks: input, market_data: input,
+        manuscript_text: input, raw_content: input, content: input,
+        // Additional structured vars with sensible fallbacks
+        peeringdb_data: input, bgp_routes: input, network_context: input,
+        alert_context: input, affected_inventory: input,
+      };
+
       const resolved = resolvePrompt(
         taskType ?? decision.prompt_template,
         {
-          input,
+          ...inputAliases,    // low priority: input as fallback for all content vars
+          ...contextVars,     // medium priority: explicit context fields override aliases
+          input,              // always available as {{input}}
           user_context: context,
-          source_data: (context?.['source_data'] as string | undefined) ?? input,
-          ...contextVars,
         },
         language ?? 'en',
       );