diff --git a/src/openhuman/tools/impl/memory/tree/ingest_document.rs b/src/openhuman/tools/impl/memory/tree/ingest_document.rs
new file mode 100644
index 000000000..a8cb4e620
--- /dev/null
+++ b/src/openhuman/tools/impl/memory/tree/ingest_document.rs
@@ -0,0 +1,141 @@
+use crate::openhuman::config::rpc as config_rpc;
+use crate::openhuman::memory::tree::canonicalize::document::DocumentInput;
+use crate::openhuman::memory::tree::rpc;
+use crate::openhuman::memory::tree::types::SourceKind;
+use crate::openhuman::tools::traits::{Tool, ToolResult};
+use async_trait::async_trait;
+use chrono::Utc;
+use serde_json::json;
+
+pub struct MemoryTreeIngestDocumentTool;
+
+#[async_trait]
+impl Tool for MemoryTreeIngestDocumentTool {
+    fn name(&self) -> &str {
+        "memory_tree_ingest_document"
+    }
+
+    fn description(&self) -> &str {
+        "Ingest a document into the memory tree for future retrieval. \
+         This is the write path into the knowledge index — use it after \
+         fetching web content, extracting facts, or collecting data from \
+         external sources. The ingested document will be chunked, embedded, \
+         and available via query_global, query_source, and search_entities."
+    }
+
+    fn parameters_schema(&self) -> serde_json::Value {
+        json!({
+            "type": "object",
+            "properties": {
+                "title": {
+                    "type": "string",
+                    "description": "Document title (e.g. 'ROOT v6.36.12 Release Notes')."
+                },
+                "body": {
+                    "type": "string",
+                    "description": "Document body in markdown or plain text."
+                },
+                "source_id": {
+                    "type": "string",
+                    "description": "Stable source identifier (e.g. 'root_releases', 'github_root_changelog'). Re-ingesting with same source_id replaces old chunks."
+                },
+                "provider": {
+                    "type": "string",
+                    "description": "Source provider name (e.g. 'github', 'web', 'root_docs'). Defaults to 'agent'."
+                },
+                "source_ref": {
+                    "type": "string",
+                    "description": "Optional URL or pointer back to the original source."
+                },
+                "owner": {
+                    "type": "string",
+                    "description": "Optional account/user this content belongs to. Used for owner-scoped queries and attribution. Defaults to empty (unowned/agent-global)."
+                }
+            },
+            "required": ["title", "body", "source_id"]
+        })
+    }
+
+    async fn execute(&self, args: serde_json::Value) -> anyhow::Result<ToolResult> {
+        log::debug!("[tool][memory_tree] ingest_document invoked");
+
+        let title = args
+            .get("title")
+            .and_then(|v| v.as_str())
+            .ok_or_else(|| anyhow::anyhow!("ingest_document: missing required field `title`"))?
+            .to_string();
+        let body = args
+            .get("body")
+            .and_then(|v| v.as_str())
+            .ok_or_else(|| anyhow::anyhow!("ingest_document: missing required field `body`"))?
+            .to_string();
+        let source_id = args
+            .get("source_id")
+            .and_then(|v| v.as_str())
+            .ok_or_else(|| anyhow::anyhow!("ingest_document: missing required field `source_id`"))?
+            .trim()
+            .to_string();
+        let provider = args
+            .get("provider")
+            .and_then(|v| v.as_str())
+            .unwrap_or("agent")
+            .to_string();
+        let source_ref = args
+            .get("source_ref")
+            .and_then(|v| v.as_str())
+            .map(|s| s.to_string());
+        let owner = args
+            .get("owner")
+            .and_then(|v| v.as_str())
+            .unwrap_or("")
+            .to_string();
+
+        if title.trim().is_empty() || body.trim().is_empty() || source_id.is_empty() {
+            return Ok(ToolResult::error(
+                "ingest_document: title, body, and source_id must be non-empty".to_string(),
+            ));
+        }
+
+        let cfg = config_rpc::load_config_with_timeout().await.map_err(|e| {
+            log::debug!("[tool][memory_tree] ingest_document config_load_failed err={e}");
+            anyhow::anyhow!("ingest_document: load config failed: {e}")
+        })?;
+
+        let doc = DocumentInput {
+            provider,
+            title: title.trim().to_string(),
+            body: body.trim().to_string(),
+            modified_at: Utc::now(),
+            source_ref,
+        };
+
+        let req = rpc::IngestRequest {
+            source_kind: SourceKind::Document,
+            source_id: source_id.clone(),
+            owner,
+            tags: vec!["agent_ingested".to_string()],
+            payload: serde_json::to_value(&doc).map_err(|e| {
+                log::debug!("[tool][memory_tree] ingest_document payload_serialize_failed err={e}");
+                anyhow::anyhow!("ingest_document: failed to serialize payload: {e}")
+            })?,
+        };
+
+        let outcome = rpc::ingest_rpc(&cfg, req).await.map_err(|e| {
+            log::debug!(
+                "[tool][memory_tree] ingest_document rpc_failed source_id={source_id} err={e}"
+            );
+            anyhow::anyhow!("ingest_document: ingestion failed: {e}")
+        })?;
+
+        let n = outcome.value.chunks_written;
+        log::info!(
+            "[tool][memory_tree] ingest_document done source_id={} chunks={}",
+            source_id,
+            n
+        );
+        Ok(ToolResult::success(format!(
+            "Ingested document \"{}\" as source_id={}. {} chunks created and indexed.",
+            title, source_id, n
+        )))
+    }
+}
diff --git a/src/openhuman/tools/impl/memory/tree/mod.rs b/src/openhuman/tools/impl/memory/tree/mod.rs
index c0b4c99a8..2030ae10c 100644
--- a/src/openhuman/tools/impl/memory/tree/mod.rs
+++ b/src/openhuman/tools/impl/memory/tree/mod.rs
@@ -9,6 +9,7 @@
 
 mod drill_down;
 mod fetch_leaves;
+mod ingest_document;
 mod query_global;
 mod query_source;
 mod query_topic;
@@ -18,6 +19,7 @@ mod search_entities;
 // (e.g. tool registration in ops.rs).
 pub use drill_down::MemoryTreeDrillDownTool;
 pub use fetch_leaves::MemoryTreeFetchLeavesTool;
+pub use ingest_document::MemoryTreeIngestDocumentTool;
 pub use query_global::MemoryTreeQueryGlobalTool;
 pub use query_source::MemoryTreeQuerySourceTool;
 pub use query_topic::MemoryTreeQueryTopicTool;
@@ -46,7 +48,7 @@ impl Tool for MemoryTreeTool {
          `query_source` (filter by source type + time window), \
          `query_global` (cross-source daily digest), \
          `drill_down` (expand a coarse summary one level), \
-         `fetch_leaves` (pull raw chunks for citation)."
+         `fetch_leaves` (pull raw chunks for citation), `ingest_document` (write a document into the tree for future retrieval)."
     }
 
     fn parameters_schema(&self) -> serde_json::Value {
@@ -56,8 +58,8 @@ impl Tool for MemoryTreeTool {
                 "mode": {
                     "type": "string",
                     "enum": ["search_entities", "query_topic", "query_source",
-                             "query_global", "drill_down", "fetch_leaves"],
-                    "description": "Which retrieval operation to run."
+                             "query_global", "drill_down", "fetch_leaves", "ingest_document"],
+                    "description": "Which operation to run (retrieval or write)."
                 },
                 // search_entities params
                 "query": {
@@ -93,6 +95,27 @@ impl Tool for MemoryTreeTool {
                     "description": "drill_down: how many levels to expand (default 1, max 3)."
                 },
                 // fetch_leaves params
+                // ingest_document params
+                "title": {
+                    "type": "string",
+                    "description": "ingest_document: document title."
+                },
+                "body": {
+                    "type": "string",
+                    "description": "ingest_document: document body (markdown or plain text)."
+                },
+                "source_id": {
+                    "type": "string",
+                    "description": "ingest_document / query_source: stable source identifier. For ingest, re-ingesting same id replaces old chunks."
+                },
+                "provider": {
+                    "type": "string",
+                    "description": "ingest_document: source provider (e.g. github, web, root_docs). Defaults to agent."
+                },
+                "source_ref": {
+                    "type": "string",
+                    "description": "ingest_document: optional URL back to original source."
+                },
                 "chunk_ids": {
                     "type": "array",
                     "items": {"type": "string"},
@@ -121,9 +144,13 @@ impl Tool for MemoryTreeTool {
             "query_global" => MemoryTreeQueryGlobalTool.execute(args).await,
             "drill_down" => MemoryTreeDrillDownTool.execute(args).await,
             "fetch_leaves" => MemoryTreeFetchLeavesTool.execute(args).await,
-            other => Err(anyhow::anyhow!(
-                "memory_tree: unknown mode `{other}`. Valid: search_entities, query_topic, query_source, query_global, drill_down, fetch_leaves"
-            )),
+            "ingest_document" => MemoryTreeIngestDocumentTool.execute(args).await,
+            other => {
+                log::debug!("[tool][memory_tree] unknown_mode mode={other}");
+                Err(anyhow::anyhow!(
+                    "memory_tree: unknown mode `{other}`. Valid: search_entities, query_topic, query_source, query_global, drill_down, fetch_leaves, ingest_document"
+                ))
+            }
         }
     }
 }
@@ -147,7 +174,7 @@ mod memory_tree_dispatcher_tests {
     }
 
     #[test]
-    fn memory_tree_schema_mode_enum_has_all_six_modes() {
+    fn memory_tree_schema_mode_enum_has_all_modes() {
         let schema = MemoryTreeTool.parameters_schema();
         let modes: Vec<&str> = schema
             .get("properties")
@@ -167,6 +194,7 @@ mod memory_tree_dispatcher_tests {
         assert!(modes.contains(&"query_global"));
         assert!(modes.contains(&"drill_down"));
         assert!(modes.contains(&"fetch_leaves"));
+        assert!(modes.contains(&"ingest_document"));
     }
 
     #[tokio::test]