feat(secrets-mcp): 增强 MCP 请求日志与 encryption_key 参数支持

logging.rs:
- 每条 MCP POST 日志新增 auth_key（Bearer token 前12字符掩码）、
  enc_key（X-Encryption-Key 前4后4字符指纹，如 146b…5516(64) 或 absent）、
  user_id、tool_args（白名单非敏感参数摘要）字段
- 新增辅助函数 mask_bearer / mask_enc_key / extract_tool_args / summarize_value

tools.rs:
- extract_enc_key 成功路径增加 debug 级指纹日志（raw_len/trimmed_len/prefix/suffix）
- 新增 extract_enc_key_or_arg / require_user_and_key_or_arg：优先使用参数传入的密钥，
  fallback 到 X-Encryption-Key 头，绕过 Cursor Chat MCP 头透传异常
- GetSecretInput / AddInput / UpdateInput / ExportInput / EnvMapInput 各增加可选
  encryption_key 字段，对应工具实现改用 require_user_and_key_or_arg

Cargo.lock

@@ -2066,7 +2066,7 @@ dependencies = [
 
 [[package]]
 name = "secrets-mcp"
-version = "0.5.6"
+version = "0.5.7"
 dependencies = [
  "anyhow",
  "askama",

crates/secrets-core/src/db.rs

@@ -1,7 +1,7 @@
 use std::str::FromStr;
 
 use anyhow::{Context, Result};
-use serde_json::Value;
+use serde_json::{Map, Value};
 use sqlx::PgPool;
 use sqlx::postgres::{PgConnectOptions, PgPoolOptions, PgSslMode};
 
@@ -562,4 +562,75 @@ pub async fn snapshot_secret_history(
     Ok(())
 }
 
+pub const ENTRY_HISTORY_SECRETS_KEY: &str = "__secrets_snapshot_v1";
+
+#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]
+pub struct EntrySecretSnapshot {
+    pub name: String,
+    #[serde(rename = "type")]
+    pub secret_type: String,
+    pub encrypted_hex: String,
+}
+
+pub async fn metadata_with_secret_snapshot(
+    tx: &mut sqlx::Transaction<'_, sqlx::Postgres>,
+    entry_id: uuid::Uuid,
+    metadata: &Value,
+) -> Result<Value> {
+    #[derive(sqlx::FromRow)]
+    struct Row {
+        name: String,
+        #[sqlx(rename = "type")]
+        secret_type: String,
+        encrypted: Vec<u8>,
+    }
+
+    let rows: Vec<Row> = sqlx::query_as(
+        "SELECT s.name, s.type, s.encrypted \
+         FROM entry_secrets es \
+         JOIN secrets s ON s.id = es.secret_id \
+         WHERE es.entry_id = $1 \
+         ORDER BY s.name ASC",
+    )
+    .bind(entry_id)
+    .fetch_all(&mut **tx)
+    .await?;
+
+    let snapshots: Vec<EntrySecretSnapshot> = rows
+        .into_iter()
+        .map(|r| EntrySecretSnapshot {
+            name: r.name,
+            secret_type: r.secret_type,
+            encrypted_hex: ::hex::encode(r.encrypted),
+        })
+        .collect();
+
+    let mut merged = match metadata.clone() {
+        Value::Object(obj) => obj,
+        _ => Map::new(),
+    };
+    merged.insert(
+        ENTRY_HISTORY_SECRETS_KEY.to_string(),
+        serde_json::to_value(snapshots)?,
+    );
+    Ok(Value::Object(merged))
+}
+
+pub fn strip_secret_snapshot_from_metadata(metadata: &Value) -> Value {
+    let mut m = match metadata.clone() {
+        Value::Object(obj) => obj,
+        _ => return metadata.clone(),
+    };
+    m.remove(ENTRY_HISTORY_SECRETS_KEY);
+    Value::Object(m)
+}
+
+pub fn entry_secret_snapshot_from_metadata(metadata: &Value) -> Option<Vec<EntrySecretSnapshot>> {
+    let Value::Object(map) = metadata else {
+        return None;
+    };
+    let raw = map.get(ENTRY_HISTORY_SECRETS_KEY)?;
+    serde_json::from_value(raw.clone()).ok()
+}
+
 // ── DB helpers ────────────────────────────────────────────────────────────────

crates/secrets-core/src/service/add.rs

@@ -223,8 +223,16 @@ pub async fn run(pool: &PgPool, params: AddParams<'_>, master_key: &[u8; 32]) ->
         .await?
     };
 
-    if let Some(ref ex) = existing
-        && let Err(e) = db::snapshot_entry_history(
+    if let Some(ref ex) = existing {
+        let history_metadata =
+            match db::metadata_with_secret_snapshot(&mut tx, ex.id, &ex.metadata).await {
+                Ok(v) => v,
+                Err(e) => {
+                    tracing::warn!(error = %e, "failed to build secret snapshot for entry history");
+                    ex.metadata.clone()
+                }
+            };
+        if let Err(e) = db::snapshot_entry_history(
             &mut tx,
             db::EntrySnapshotParams {
                 entry_id: ex.id,
@@ -235,13 +243,14 @@ pub async fn run(pool: &PgPool, params: AddParams<'_>, master_key: &[u8; 32]) ->
                 version: ex.version,
                 action: "add",
                 tags: &ex.tags,
-                metadata: &ex.metadata,
+                metadata: &history_metadata,
             },
         )
         .await
         {
             tracing::warn!(error = %e, "failed to snapshot entry history before upsert");
         }
+    }
 
     // Upsert the entry row. On conflict (existing entry with same user_id+folder+name),
     // the entry columns are replaced wholesale. The old secret associations are torn down
@@ -303,26 +312,6 @@ pub async fn run(pool: &PgPool, params: AddParams<'_>, master_key: &[u8; 32]) ->
             .fetch_one(&mut *tx)
             .await?;
 
-    if existing.is_none()
-        && let Err(e) = db::snapshot_entry_history(
-            &mut tx,
-            db::EntrySnapshotParams {
-                entry_id,
-                user_id: params.user_id,
-                folder: params.folder,
-                entry_type,
-                name: params.name,
-                version: current_entry_version,
-                action: "create",
-                tags: params.tags,
-                metadata: &metadata,
-            },
-        )
-        .await
-    {
-        tracing::warn!(error = %e, "failed to snapshot entry history on create");
-    }
-
     if existing.is_some() {
         #[derive(sqlx::FromRow)]
         struct ExistingField {
@@ -432,6 +421,35 @@ pub async fn run(pool: &PgPool, params: AddParams<'_>, master_key: &[u8; 32]) ->
         }
     }
 
+    if existing.is_none() {
+        let history_metadata =
+            match db::metadata_with_secret_snapshot(&mut tx, entry_id, &metadata).await {
+                Ok(v) => v,
+                Err(e) => {
+                    tracing::warn!(error = %e, "failed to build secret snapshot for entry history");
+                    metadata.clone()
+                }
+            };
+        if let Err(e) = db::snapshot_entry_history(
+            &mut tx,
+            db::EntrySnapshotParams {
+                entry_id,
+                user_id: params.user_id,
+                folder: params.folder,
+                entry_type,
+                name: params.name,
+                version: current_entry_version,
+                action: "create",
+                tags: params.tags,
+                metadata: &history_metadata,
+            },
+        )
+        .await
+        {
+            tracing::warn!(error = %e, "failed to snapshot entry history on create");
+        }
+    }
+
     crate::audit::log_tx(
         &mut tx,
         params.user_id,

crates/secrets-core/src/service/delete.rs

@@ -441,6 +441,15 @@ async fn snapshot_and_delete(
     row: &EntryRow,
     user_id: Option<Uuid>,
 ) -> Result<()> {
+    let history_metadata = match db::metadata_with_secret_snapshot(tx, row.id, &row.metadata).await
+    {
+        Ok(v) => v,
+        Err(e) => {
+            tracing::warn!(error = %e, "failed to build secret snapshot for entry history");
+            row.metadata.clone()
+        }
+    };
+
     if let Err(e) = db::snapshot_entry_history(
         tx,
         db::EntrySnapshotParams {
@@ -452,7 +461,7 @@ async fn snapshot_and_delete(
             version: row.version,
             action: "delete",
             tags: &row.tags,
-            metadata: &row.metadata,
+            metadata: &history_metadata,
         },
     )
     .await

crates/secrets-core/src/service/history.rs

@@ -31,8 +31,11 @@ pub async fn run(
     let entry = resolve_entry(pool, name, folder, user_id).await?;
 
     let rows: Vec<Row> = sqlx::query_as(
-        "SELECT version, action, created_at FROM entries_history \
-         WHERE entry_id = $1 ORDER BY id DESC LIMIT $2",
+        "SELECT DISTINCT ON (version) version, action, created_at \
+         FROM entries_history \
+         WHERE entry_id = $1 \
+         ORDER BY version DESC, id DESC \
+         LIMIT $2",
     )
     .bind(entry.id)
     .bind(limit as i64)

crates/secrets-core/src/service/rollback.rs

@@ -1,3 +1,5 @@
+use std::collections::HashSet;
+
 use anyhow::Result;
 use serde_json::Value;
 use sqlx::PgPool;
@@ -122,7 +124,7 @@ pub async fn run(
         sqlx::query_as(
             "SELECT folder, type, version, action, tags, metadata \
              FROM entries_history \
-             WHERE entry_id = $1 AND version = $2 ORDER BY id DESC LIMIT 1",
+             WHERE entry_id = $1 AND version = $2 ORDER BY id ASC LIMIT 1",
         )
         .bind(entry_id)
         .bind(ver)
@@ -149,6 +151,9 @@ pub async fn run(
         )
     })?;
 
+    let snap_secret_snapshot = db::entry_secret_snapshot_from_metadata(&snap.metadata);
+    let snap_metadata = db::strip_secret_snapshot_from_metadata(&snap.metadata);
+
     let _ = master_key;
 
     let mut tx = pool.begin().await?;
@@ -176,6 +181,15 @@ pub async fn run(
     .await?;
 
     let live_entry_id = if let Some(ref lr) = live {
+        let history_metadata =
+            match db::metadata_with_secret_snapshot(&mut tx, lr.id, &lr.metadata).await {
+                Ok(v) => v,
+                Err(e) => {
+                    tracing::warn!(error = %e, "failed to build secret snapshot for entry history");
+                    lr.metadata.clone()
+                }
+            };
+
         if let Err(e) = db::snapshot_entry_history(
             &mut tx,
             db::EntrySnapshotParams {
@@ -187,7 +201,7 @@ pub async fn run(
                 version: lr.version,
                 action: "rollback",
                 tags: &lr.tags,
-                metadata: &lr.metadata,
+                metadata: &history_metadata,
             },
         )
         .await
@@ -234,7 +248,7 @@ pub async fn run(
         .bind(&snap.folder)
         .bind(&snap.entry_type)
         .bind(&snap.tags)
-        .bind(&snap.metadata)
+        .bind(&snap_metadata)
         .bind(lr.id)
         .execute(&mut *tx)
         .await?;
@@ -252,7 +266,7 @@ pub async fn run(
             .bind(&snap.entry_type)
             .bind(name)
             .bind(&snap.tags)
-            .bind(&snap.metadata)
+            .bind(&snap_metadata)
             .bind(snap.version)
             .fetch_one(&mut *tx)
             .await?
@@ -266,16 +280,16 @@ pub async fn run(
             .bind(&snap.entry_type)
             .bind(name)
             .bind(&snap.tags)
-            .bind(&snap.metadata)
+            .bind(&snap_metadata)
             .bind(snap.version)
             .fetch_one(&mut *tx)
             .await?
         }
     };
 
-    // In N:N mode, rollback restores entry metadata/tags only.
-    // Secret snapshots are kept for audit but secret linkage/content is not rewritten here.
-    let _ = live_entry_id;
+    if let Some(secret_snapshot) = snap_secret_snapshot {
+        restore_entry_secrets(&mut tx, live_entry_id, user_id, &secret_snapshot).await?;
+    }
 
     crate::audit::log_tx(
         &mut tx,
@@ -300,3 +314,144 @@ pub async fn run(
         restored_version: snap.version,
     })
 }
+
+async fn restore_entry_secrets(
+    tx: &mut sqlx::Transaction<'_, sqlx::Postgres>,
+    entry_id: Uuid,
+    user_id: Option<Uuid>,
+    snapshot: &[db::EntrySecretSnapshot],
+) -> Result<()> {
+    #[derive(sqlx::FromRow)]
+    struct LinkedSecret {
+        id: Uuid,
+        name: String,
+        encrypted: Vec<u8>,
+    }
+
+    let linked: Vec<LinkedSecret> = sqlx::query_as(
+        "SELECT s.id, s.name, s.encrypted \
+         FROM entry_secrets es \
+         JOIN secrets s ON s.id = es.secret_id \
+         WHERE es.entry_id = $1",
+    )
+    .bind(entry_id)
+    .fetch_all(&mut **tx)
+    .await?;
+
+    let target_names: HashSet<&str> = snapshot.iter().map(|s| s.name.as_str()).collect();
+
+    for s in &linked {
+        if target_names.contains(s.name.as_str()) {
+            continue;
+        }
+        if let Err(e) = db::snapshot_secret_history(
+            tx,
+            db::SecretSnapshotParams {
+                secret_id: s.id,
+                name: &s.name,
+                encrypted: &s.encrypted,
+                action: "rollback",
+            },
+        )
+        .await
+        {
+            tracing::warn!(error = %e, "failed to snapshot secret before rollback unlink");
+        }
+
+        sqlx::query("DELETE FROM entry_secrets WHERE entry_id = $1 AND secret_id = $2")
+            .bind(entry_id)
+            .bind(s.id)
+            .execute(&mut **tx)
+            .await?;
+
+        sqlx::query(
+            "DELETE FROM secrets s \
+             WHERE s.id = $1 \
+               AND NOT EXISTS (SELECT 1 FROM entry_secrets es WHERE es.secret_id = s.id)",
+        )
+        .bind(s.id)
+        .execute(&mut **tx)
+        .await?;
+    }
+
+    for snap in snapshot {
+        let encrypted = ::hex::decode(&snap.encrypted_hex).map_err(|e| {
+            anyhow::anyhow!("invalid secret snapshot data for '{}': {}", snap.name, e)
+        })?;
+
+        #[derive(sqlx::FromRow)]
+        struct ExistingSecret {
+            id: Uuid,
+            encrypted: Vec<u8>,
+        }
+
+        let existing: Option<ExistingSecret> = if let Some(uid) = user_id {
+            sqlx::query_as("SELECT id, encrypted FROM secrets WHERE user_id = $1 AND name = $2")
+                .bind(uid)
+                .bind(&snap.name)
+                .fetch_optional(&mut **tx)
+                .await?
+        } else {
+            sqlx::query_as("SELECT id, encrypted FROM secrets WHERE user_id IS NULL AND name = $1")
+                .bind(&snap.name)
+                .fetch_optional(&mut **tx)
+                .await?
+        };
+
+        let secret_id = if let Some(ex) = existing {
+            if ex.encrypted != encrypted
+                && let Err(e) = db::snapshot_secret_history(
+                    tx,
+                    db::SecretSnapshotParams {
+                        secret_id: ex.id,
+                        name: &snap.name,
+                        encrypted: &ex.encrypted,
+                        action: "rollback",
+                    },
+                )
+                .await
+            {
+                tracing::warn!(error = %e, "failed to snapshot secret before rollback restore");
+            }
+            sqlx::query(
+                "UPDATE secrets SET type = $1, encrypted = $2, version = version + 1, updated_at = NOW() \
+                 WHERE id = $3",
+            )
+            .bind(&snap.secret_type)
+            .bind(&encrypted)
+            .bind(ex.id)
+            .execute(&mut **tx)
+            .await?;
+            ex.id
+        } else if let Some(uid) = user_id {
+            sqlx::query_scalar(
+                "INSERT INTO secrets (user_id, name, type, encrypted) VALUES ($1, $2, $3, $4) RETURNING id",
+            )
+            .bind(uid)
+            .bind(&snap.name)
+            .bind(&snap.secret_type)
+            .bind(&encrypted)
+            .fetch_one(&mut **tx)
+            .await?
+        } else {
+            sqlx::query_scalar(
+                "INSERT INTO secrets (user_id, name, type, encrypted) VALUES (NULL, $1, $2, $3) RETURNING id",
+            )
+            .bind(&snap.name)
+            .bind(&snap.secret_type)
+            .bind(&encrypted)
+            .fetch_one(&mut **tx)
+            .await?
+        };
+
+        sqlx::query(
+            "INSERT INTO entry_secrets (entry_id, secret_id) VALUES ($1, $2) ON CONFLICT DO NOTHING",
+        )
+        .bind(entry_id)
+        .bind(secret_id)
+        .execute(&mut **tx)
+        .await?;
+    }
+
+    Ok(())
+}

crates/secrets-core/src/service/update.rs

@@ -112,6 +112,15 @@ pub async fn run(
         }
     };
 
+    let history_metadata =
+        match db::metadata_with_secret_snapshot(&mut tx, row.id, &row.metadata).await {
+            Ok(v) => v,
+            Err(e) => {
+                tracing::warn!(error = %e, "failed to build secret snapshot for entry history");
+                row.metadata.clone()
+            }
+        };
+
     if let Err(e) = db::snapshot_entry_history(
         &mut tx,
         db::EntrySnapshotParams {
@@ -123,7 +132,7 @@ pub async fn run(
             version: row.version,
             action: "update",
             tags: &row.tags,
-            metadata: &row.metadata,
+            metadata: &history_metadata,
         },
     )
     .await
@@ -481,6 +490,15 @@ pub async fn update_fields_by_id(
         }
     };
 
+    let history_metadata =
+        match db::metadata_with_secret_snapshot(&mut tx, row.id, &row.metadata).await {
+            Ok(v) => v,
+            Err(e) => {
+                tracing::warn!(error = %e, "failed to build secret snapshot for entry history");
+                row.metadata.clone()
+            }
+        };
+
     if let Err(e) = db::snapshot_entry_history(
         &mut tx,
         db::EntrySnapshotParams {
@@ -492,7 +510,7 @@ pub async fn update_fields_by_id(
             version: row.version,
             action: "update",
             tags: &row.tags,
-            metadata: &row.metadata,
+            metadata: &history_metadata,
         },
     )
     .await

crates/secrets-mcp/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "secrets-mcp"
-version = "0.5.6"
+version = "0.5.7"
 edition.workspace = true
 
 [[bin]]

crates/secrets-mcp/src/logging.rs

@@ -5,20 +5,24 @@ use axum::{
     extract::Request,
     http::{
         HeaderMap, Method, StatusCode,
-        header::{CONTENT_LENGTH, CONTENT_TYPE, USER_AGENT},
+        header::{AUTHORIZATION, CONTENT_LENGTH, CONTENT_TYPE, USER_AGENT},
     },
     middleware::Next,
     response::{IntoResponse, Response},
 };
 
+use crate::auth::AuthUser;
+
 /// Axum middleware that logs structured info for every HTTP request.
 ///
 /// All requests: method, path, status, latency_ms, client_ip, user_agent.
 /// POST /mcp requests: additionally parses JSON-RPC body for jsonrpc_method,
-/// tool_name, jsonrpc_id, mcp_session, batch_size.
+/// tool_name, jsonrpc_id, mcp_session, batch_size, tool_args (non-sensitive
+/// arguments only), plus masked auth_key / enc_key fingerprints and user_id
+/// for diagnosing header forwarding issues.
 ///
-/// Sensitive headers (Authorization, X-Encryption-Key) and secret values
-/// are never logged.
+/// Sensitive headers (Authorization, X-Encryption-Key) are never logged in
+/// full — only short fingerprints are emitted.
 pub async fn request_logging_middleware(req: Request, next: Next) -> Response {
     let method = req.method().clone();
     let path = req.uri().path().to_string();
@@ -32,6 +36,10 @@ pub async fn request_logging_middleware(req: Request, next: Next) -> Response {
         .and_then(|v| v.to_str().ok())
         .map(|s| s.to_string());
 
+    // Capture header fingerprints before consuming the request.
+    let auth_key = mask_bearer(req.headers());
+    let enc_key = mask_enc_key(req.headers());
+
     let is_mcp_post = path.starts_with("/mcp") && method == Method::POST;
     let is_json = header_str(req.headers(), CONTENT_TYPE)
         .map(|ct| ct.contains("application/json"))
@@ -45,6 +53,11 @@ pub async fn request_logging_middleware(req: Request, next: Next) -> Response {
         let cap = content_len.unwrap_or(0);
         if cap <= 512 * 1024 {
             let (parts, body) = req.into_parts();
+            // user_id is available after auth middleware has run (injected into extensions).
+            let user_id = parts
+                .extensions
+                .get::<AuthUser>()
+                .map(|a| a.user_id.to_string());
             match to_bytes(body, 512 * 1024).await {
                 Ok(bytes) => {
                     let rpc = parse_jsonrpc_meta(&bytes);
@@ -61,6 +74,9 @@ pub async fn request_logging_middleware(req: Request, next: Next) -> Response {
                         ua.as_deref(),
                         content_len,
                         mcp_session.as_deref(),
+                        auth_key.as_deref(),
+                        &enc_key,
+                        user_id.as_deref(),
                         &rpc,
                     );
                     return resp;
@@ -77,6 +93,9 @@ pub async fn request_logging_middleware(req: Request, next: Next) -> Response {
                         ua = ua.as_deref(),
                         content_length = content_len,
                         mcp_session = mcp_session.as_deref(),
+                        auth_key = auth_key.as_deref(),
+                        enc_key = enc_key.as_str(),
+                        user_id = user_id.as_deref(),
                         "mcp request",
                     );
                     return (
@@ -159,6 +178,9 @@ fn log_mcp_request(
     ua: Option<&str>,
     content_length: Option<u64>,
     mcp_session: Option<&str>,
+    auth_key: Option<&str>,
+    enc_key: &str,
+    user_id: Option<&str>,
     rpc: &JsonRpcMeta,
 ) {
     tracing::info!(
@@ -174,18 +196,94 @@ fn log_mcp_request(
         tool = rpc.tool_name.as_deref(),
         jsonrpc_id = rpc.request_id.as_deref(),
         batch_size = rpc.batch_size,
+        tool_args = rpc.tool_args.as_deref(),
+        auth_key,
+        enc_key,
+        user_id,
         "mcp request",
     );
 }
 
+// ── Sensitive header masking ──────────────────────────────────────────────────
+
+/// Mask a Bearer token: emit only the first 12 characters followed by `…`.
+/// Returns `None` if the Authorization header is absent or not a Bearer token.
+/// Example: `sk_90c88844e4e5…`
+fn mask_bearer(headers: &HeaderMap) -> Option<String> {
+    let val = headers.get(AUTHORIZATION)?.to_str().ok()?;
+    let token = val.strip_prefix("Bearer ")?.trim();
+    if token.is_empty() {
+        return None;
+    }
+    if token.len() > 12 {
+        Some(format!("{}…", &token[..12]))
+    } else {
+        Some(token.to_string())
+    }
+}
+
+/// Fingerprint the X-Encryption-Key header.
+///
+/// Emits first 4 chars, last 4 chars, and raw byte length, e.g. `146b…5516(64)`.
+/// Returns `"absent"` when the header is missing. Reveals enough to confirm
+/// which key arrived and whether it was truncated or padded, without revealing
+/// the full value.
+fn mask_enc_key(headers: &HeaderMap) -> String {
+    match headers
+        .get("x-encryption-key")
+        .and_then(|v| v.to_str().ok())
+    {
+        Some(val) => {
+            let raw_len = val.len();
+            let t = val.trim();
+            let len = t.len();
+            if len >= 8 {
+                let prefix = &t[..4];
+                let suffix = &t[len - 4..];
+                if raw_len != len {
+                    // Trailing/leading whitespace detected — extra diagnostic.
+                    format!("{prefix}…{suffix}({len}, raw={raw_len})")
+                } else {
+                    format!("{prefix}…{suffix}({len})")
+                }
+            } else {
+                format!("…({len})")
+            }
+        }
+        None => "absent".to_string(),
+    }
+}
+
 // ── JSON-RPC body parsing ─────────────────────────────────────────────────────
 
+/// Safe (non-sensitive) argument keys that may be included verbatim in logs.
+/// Keys NOT in this list (e.g. `secrets`, `secrets_obj`, `meta_obj`,
+/// `encryption_key`) are silently dropped.
+const SAFE_ARG_KEYS: &[&str] = &[
+    "id",
+    "name",
+    "name_query",
+    "folder",
+    "type",
+    "entry_type",
+    "field",
+    "query",
+    "tags",
+    "limit",
+    "offset",
+    "format",
+    "dry_run",
+    "prefix",
+];
+
 #[derive(Debug, Default)]
 struct JsonRpcMeta {
     request_id: Option<String>,
     rpc_method: Option<String>,
     tool_name: Option<String>,
     batch_size: Option<usize>,
+    /// Non-sensitive tool call arguments for diagnostic logging.
+    tool_args: Option<String>,
 }
 
 fn parse_jsonrpc_meta(bytes: &Bytes) -> JsonRpcMeta {
@@ -215,12 +313,47 @@ fn parse_single(value: &serde_json::Value) -> JsonRpcMeta {
         .pointer("/params/name")
         .and_then(|v| v.as_str())
         .map(|s| s.to_string());
+    let tool_args = extract_tool_args(value);
 
     JsonRpcMeta {
         request_id,
         rpc_method,
         tool_name,
         batch_size: None,
+        tool_args,
+    }
+}
+
+/// Extract a compact summary of non-sensitive tool arguments for logging.
+/// Only keys listed in `SAFE_ARG_KEYS` are included.
+fn extract_tool_args(value: &serde_json::Value) -> Option<String> {
+    let args = value.pointer("/params/arguments")?;
+    let obj = args.as_object()?;
+    let pairs: Vec<String> = obj
+        .iter()
+        .filter(|(k, v)| SAFE_ARG_KEYS.contains(&k.as_str()) && !v.is_null())
+        .map(|(k, v)| format!("{}={}", k, summarize_value(v)))
+        .collect();
+    if pairs.is_empty() {
+        None
+    } else {
+        Some(pairs.join(" "))
+    }
+}
+
+/// Produce a short, log-safe representation of a JSON value.
+fn summarize_value(v: &serde_json::Value) -> String {
+    match v {
+        serde_json::Value::String(s) => {
+            if s.len() > 64 {
+                format!("\"{}…\"", &s[..64])
+            } else {
+                format!("\"{s}\"")
+            }
+        }
+        serde_json::Value::Array(arr) => format!("[…{}]", arr.len()),
+        serde_json::Value::Object(_) => "{…}".to_string(),
+        other => other.to_string(),
     }
 }
 

crates/secrets-mcp/src/tools.rs

@@ -265,6 +265,18 @@ impl SecretsService {
                 rmcp::ErrorData::invalid_request("Invalid X-Encryption-Key header value", None)
             })?;
         let trimmed = hex_str.trim();
+        // Debug-level fingerprint: helps diagnose header forwarding issues
+        // (e.g. Cursor Chat MCP truncating or transforming the key value)
+        // without revealing the full secret.
+        tracing::debug!(
+            raw_len = hex_str.len(),
+            trimmed_len = trimmed.len(),
+            key_prefix = trimmed.get(..8).unwrap_or(trimmed),
+            key_suffix = trimmed
+                .get(trimmed.len().saturating_sub(8)..)
+                .unwrap_or(trimmed),
+            "X-Encryption-Key received",
+        );
         if trimmed.len() != 64 {
             tracing::warn!(
                 got_len = trimmed.len(),
@@ -289,7 +301,51 @@ impl SecretsService {
             .map_err(mcp_err_invalid_encryption_key_logged)
     }
 
-    /// Require both user_id and encryption key.
+    /// Extract the encryption key, preferring an explicit argument value over
+    /// the X-Encryption-Key HTTP header.
+    ///
+    /// `arg_key` is the optional `encryption_key` field from the tool's input
+    /// struct. When present, it is used directly and the header is ignored.
+    /// This allows MCP clients that cannot reliably forward custom HTTP headers
+    /// (e.g. Cursor Chat) to pass the key as a normal tool argument.
+    fn extract_enc_key_or_arg(
+        ctx: &RequestContext<RoleServer>,
+        arg_key: Option<&str>,
+    ) -> Result<[u8; 32], rmcp::ErrorData> {
+        if let Some(hex_str) = arg_key {
+            let trimmed = hex_str.trim();
+            tracing::debug!(
+                source = "argument",
+                raw_len = hex_str.len(),
+                trimmed_len = trimmed.len(),
+                key_prefix = trimmed.get(..8).unwrap_or(trimmed),
+                key_suffix = trimmed
+                    .get(trimmed.len().saturating_sub(8)..)
+                    .unwrap_or(trimmed),
+                "X-Encryption-Key received",
+            );
+            if trimmed.len() != 64 {
+                return Err(rmcp::ErrorData::invalid_request(
+                    format!(
+                        "encryption_key must be exactly 64 hex characters (32-byte key), got {}.",
+                        trimmed.len()
+                    ),
+                    None,
+                ));
+            }
+            if !trimmed.chars().all(|c| c.is_ascii_hexdigit()) {
+                return Err(rmcp::ErrorData::invalid_request(
+                    "encryption_key contains non-hexadecimal characters.",
+                    None,
+                ));
+            }
+            return secrets_core::crypto::extract_key_from_hex(trimmed)
+                .map_err(mcp_err_invalid_encryption_key_logged);
+        }
+        Self::extract_enc_key(ctx)
+    }
+
+    /// Require both user_id and encryption key (header only, no arg fallback).
     fn require_user_and_key(
         ctx: &RequestContext<RoleServer>,
     ) -> Result<(Uuid, [u8; 32]), rmcp::ErrorData> {
@@ -297,6 +353,17 @@ impl SecretsService {
         let key = Self::extract_enc_key(ctx)?;
         Ok((user_id, key))
     }
+
+    /// Require both user_id and encryption key, preferring an explicit argument
+    /// value over the X-Encryption-Key header.
+    fn require_user_and_key_or_arg(
+        ctx: &RequestContext<RoleServer>,
+        arg_key: Option<&str>,
+    ) -> Result<(Uuid, [u8; 32]), rmcp::ErrorData> {
+        let user_id = Self::require_user_id(ctx)?;
+        let key = Self::extract_enc_key_or_arg(ctx, arg_key)?;
+        Ok((user_id, key))
+    }
 }
 
 // ── Tool parameter types ──────────────────────────────────────────────────────
@@ -370,6 +437,10 @@ struct GetSecretInput {
     id: String,
     #[schemars(description = "Specific field to retrieve. If omitted, returns all fields.")]
     field: Option<String>,
+    #[schemars(description = "Encryption key as a 64-char hex string. \
+        If provided, takes priority over the X-Encryption-Key HTTP header. \
+        Use this when the MCP client cannot reliably forward custom headers.")]
+    encryption_key: Option<String>,
 }
 
 #[derive(Debug, Deserialize, JsonSchema)]
@@ -416,6 +487,10 @@ struct AddInput {
     )]
     #[serde(default, deserialize_with = "deser::option_vec_string_from_string")]
     link_secret_names: Option<Vec<String>>,
+    #[schemars(description = "Encryption key as a 64-char hex string. \
+        If provided, takes priority over the X-Encryption-Key HTTP header. \
+        Use this when the MCP client cannot reliably forward custom headers.")]
+    encryption_key: Option<String>,
 }
 
 #[derive(Debug, Deserialize, JsonSchema)]
@@ -477,6 +552,10 @@ struct UpdateInput {
     )]
     #[serde(default, deserialize_with = "deser::option_vec_string_from_string")]
     unlink_secret_names: Option<Vec<String>>,
+    #[schemars(description = "Encryption key as a 64-char hex string. \
+        If provided, takes priority over the X-Encryption-Key HTTP header. \
+        Use this when the MCP client cannot reliably forward custom headers.")]
+    encryption_key: Option<String>,
 }
 
 #[derive(Debug, Deserialize, JsonSchema)]
@@ -549,6 +628,10 @@ struct ExportInput {
     query: Option<String>,
     #[schemars(description = "Export format: 'json' (default), 'toml', 'yaml'")]
     format: Option<String>,
+    #[schemars(description = "Encryption key as a 64-char hex string. \
+        If provided, takes priority over the X-Encryption-Key HTTP header. \
+        Use this when the MCP client cannot reliably forward custom headers.")]
+    encryption_key: Option<String>,
 }
 
 #[derive(Debug, Deserialize, JsonSchema)]
@@ -572,6 +655,10 @@ struct EnvMapInput {
         Example: entry 'aliyun', field 'access_key_id' → ALIYUN_ACCESS_KEY_ID \
         (or PREFIX_ALIYUN_ACCESS_KEY_ID with prefix set).")]
     prefix: Option<String>,
+    #[schemars(description = "Encryption key as a 64-char hex string. \
+        If provided, takes priority over the X-Encryption-Key HTTP header. \
+        Use this when the MCP client cannot reliably forward custom headers.")]
+    encryption_key: Option<String>,
 }
 
 #[derive(Debug, Deserialize, JsonSchema)]
@@ -876,7 +963,8 @@ impl SecretsService {
         ctx: RequestContext<RoleServer>,
     ) -> Result<CallToolResult, rmcp::ErrorData> {
         let t = Instant::now();
-        let (user_id, user_key) = Self::require_user_and_key(&ctx)?;
+        let (user_id, user_key) =
+            Self::require_user_and_key_or_arg(&ctx, input.encryption_key.as_deref())?;
         let entry_id = parse_uuid(&input.id)?;
         tracing::info!(
             tool = "secrets_get",
@@ -930,7 +1018,8 @@ impl SecretsService {
         ctx: RequestContext<RoleServer>,
     ) -> Result<CallToolResult, rmcp::ErrorData> {
         let t = Instant::now();
-        let (user_id, user_key) = Self::require_user_and_key(&ctx)?;
+        let (user_id, user_key) =
+            Self::require_user_and_key_or_arg(&ctx, input.encryption_key.as_deref())?;
         tracing::info!(
             tool = "secrets_add",
             ?user_id,
@@ -1024,7 +1113,8 @@ impl SecretsService {
         ctx: RequestContext<RoleServer>,
     ) -> Result<CallToolResult, rmcp::ErrorData> {
         let t = Instant::now();
-        let (user_id, user_key) = Self::require_user_and_key(&ctx)?;
+        let (user_id, user_key) =
+            Self::require_user_and_key_or_arg(&ctx, input.encryption_key.as_deref())?;
         tracing::info!(
             tool = "secrets_update",
             ?user_id,
@@ -1318,7 +1408,8 @@ impl SecretsService {
         ctx: RequestContext<RoleServer>,
     ) -> Result<CallToolResult, rmcp::ErrorData> {
         let t = Instant::now();
-        let (user_id, user_key) = Self::require_user_and_key(&ctx)?;
+        let (user_id, user_key) =
+            Self::require_user_and_key_or_arg(&ctx, input.encryption_key.as_deref())?;
         let tags = input.tags.unwrap_or_default();
         let format = input.format.as_deref().unwrap_or("json");
         tracing::info!(
@@ -1387,7 +1478,8 @@ impl SecretsService {
         ctx: RequestContext<RoleServer>,
     ) -> Result<CallToolResult, rmcp::ErrorData> {
         let t = Instant::now();
-        let (user_id, user_key) = Self::require_user_and_key(&ctx)?;
+        let (user_id, user_key) =
+            Self::require_user_and_key_or_arg(&ctx, input.encryption_key.as_deref())?;
         let tags = input.tags.unwrap_or_default();
         let only_fields = input.only_fields.unwrap_or_default();
         tracing::info!(