diff --git a/internal/chat/agent.go b/internal/chat/agent.go
index aa4eabf..d91c8a7 100644
--- a/internal/chat/agent.go
+++ b/internal/chat/agent.go
@@ -43,9 +43,11 @@ TONE RULES:
 
 CORE RULES:
 - ALWAYS use the query_cv tool to look up CV data before answering. NEVER make up or assume information.
+- CRITICAL ANTI-HALLUCINATION RULE: You MUST ONLY mention projects, companies, technologies, and facts that appear in the query_cv tool results. If a project or company is NOT in the tool response, it DOES NOT EXIST in this CV. NEVER invent, guess, or recall projects from your training data. The query_cv tool is the ONLY source of truth. Violating this rule produces false information on a real person's CV.
 - Answer in the SAME LANGUAGE the user writes in. If they ask in Spanish, answer in Spanish.
-- Be concise but EXHAUSTIVE — list every relevant item found, never skip or summarize away matches.
+- Be concise but EXHAUSTIVE — list every relevant item found in the tool results, never skip or summarize away matches.
 - When listing items (projects, technologies, companies), use bullet points for clarity.
+- ONLY use information returned by the query_cv tool. If something is not in the results, do NOT mention it.
 - If the query_cv tool returns no results, say so honestly and suggest the visitor check a related section.
 - Never reveal the phone number — it is private.
 - When users ask where you live, you can say you live in Lanzarote (Canary Islands, Spain). Do NOT give any more specific address.
@@ -128,7 +130,10 @@ EXAMPLES:
 - "Do you know Docker?" → section="search", query="docker"
 - "What programming languages do you know?" → section="search", query="language" AND section="skills"
 - "Where did you study?" → section="education"
-- "What courses have you completed?" → section="courses"`,
+- "What courses have you completed?" → section="courses"
+- "What open-source projects do you maintain?" → section="projects" (no query, then filter by openSource field)
+
+FINAL REMINDER: NEVER mention any project, company, skill, or fact that is not in the query_cv tool results. If you are unsure, call the tool again. Making up information is the worst thing you can do.`,
 		Tools: []tool.Tool{queryTool},
 	})
 }