diff --git a/CHANGELOG.md b/CHANGELOG.md
index 559e2203..4861d11d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 ## Unreleased
 
+- Add `:config-file` cli option to pass in config.
+
 ## 0.72.2
 
 - Run `preToolCall` hook before user approval if any. #170
diff --git a/src/eca/config.clj b/src/eca/config.clj
index 5a96bee2..7a5dd5b1 100644
--- a/src/eca/config.clj
+++ b/src/eca/config.clj
@@ -4,7 +4,9 @@
   1. base: fixed config var `eca.config/initial-config`.
   2. env var: searching for a `ECA_CONFIG` env var which should contains a valid json config.
   3. local config-file: searching from a local `.eca/config.json` file.
-  4. `initializatonOptions` sent in `initialize` request."
+  4. `initializatonOptions` sent in `initialize` request.
+
+  When `:config-file` from cli option is passed, it uses that instead of searching default locations."
   (:require
    [camel-snake-kebab.core :as csk]
    [cheshire.core :as json]
@@ -23,11 +25,14 @@
 (def ^:private logger-tag "[CONFIG]")
 
 (def ^:dynamic *env-var-config-error* false)
+(def ^:dynamic *custom-config-error* false)
 (def ^:dynamic *global-config-error* false)
 (def ^:dynamic *local-config-error* false)
 
 (def ^:private listen-idle-ms 3000)
 
+(def custom-config-file-path* (atom nil))
+
 (def initial-config
   {:providers {"openai" {:api "openai-responses"
                          :url "https://api.openai.com"
@@ -148,6 +153,14 @@
 
 (def ^:private config-from-envvar (memoize config-from-envvar*))
 
+(defn ^:private config-from-custom* []
+  (when-some [path @custom-config-file-path*]
+    (let [config-file (io/file path)]
+      (when (.exists config-file)
+        (safe-read-json-string (slurp config-file) (var *custom-config-error*))))))
+
+(def ^:private config-from-custom (memoize config-from-custom*))
+
 (defn global-config-dir ^File []
   (let [xdg-config-home (or (get-env "XDG_CONFIG_HOME")
                             (io/file (get-property "user.home") ".config"))]
@@ -262,6 +275,13 @@
     [:behavior :ANY :toolCall :approval :deny :ANY :argsMatchers]
     [:otlp]]})
 
+(defn ^:private config-from-custom-or-default-location [pure-config? db]
+  (if-some [config-from-custom (config-from-custom)]
+    (when-not pure-config? config-from-custom)
+    (deep-merge
+     (when-not pure-config? (config-from-global-file))
+     (when-not pure-config? (config-from-local-file (:workspace-folders db))))))
+
 (defn all [db]
   (let [initialization-config @initialization-config*
         pure-config? (:pureConfig initialization-config)]
@@ -270,8 +290,7 @@
                  eca-config-normalization-rules
                  (deep-merge initialization-config
                              (when-not pure-config? (config-from-envvar))
-                             (when-not pure-config? (config-from-global-file))
-                             (when-not pure-config? (config-from-local-file (:workspace-folders db))))))))
+                             (config-from-custom-or-default-location pure-config? db))))))
 
 (defn validation-error []
   (cond
diff --git a/src/eca/main.clj b/src/eca/main.clj
index c2c13201..a429b9b3 100644
--- a/src/eca/main.clj
+++ b/src/eca/main.clj
@@ -42,7 +42,7 @@
 (def log-levels #{"error" "warn" "info" "debug"})
 
 (def cli-spec
-  {:order [:help :version :verbose]
+  {:order [:help :version :verbose :config-file]
    :spec {:help {:alias :h
                  :desc "Print the available commands and its options"}
           :version {:desc "Print eca version"}
@@ -52,6 +52,10 @@
                       :validate {:pred log-levels
                                  :ex-msg (fn [{:keys [_option _value]}]
                                            (format "Must be in %s" log-levels))}}
+          :config-file {:ref "<FILE>"
+                        :desc "Path to a JSON config <FILE> to use instead of searching default locations"
+                        :coerce :string
+                        :default nil}
           :verbose {:desc "Use stdout for eca logs instead of default log settings"}}})
 
 (defn ^:private parse-opts
@@ -92,6 +96,8 @@
   [action options]
   (proxy/load!)
   (when (= "server" action)
+    (when-some [cfg-file (:config-file options)]
+      (reset! config/custom-config-file-path* cfg-file))
     (alter-var-root #'logger/*level* (constantly (keyword (:log-level options))))
     (let [finished @(server/run-io-server! (:verbose options))]
       {:result-code (if (= :done finished) 0 1)})))
diff --git a/test/eca/main_test.clj b/test/eca/main_test.clj
index b0e1a627..ac3c1611 100644
--- a/test/eca/main_test.clj
+++ b/test/eca/main_test.clj
@@ -22,6 +22,10 @@
     [] {:options {:verbose m/absent}}
     ["--verbose"] {:options {:verbose true}}
     ["-v"] {:options {:verbose m/absent}}
+    ;; config-file
+    [] {:options {:config-file m/absent}}
+    ["--config-file"] {:options {:config-file m/absent}}
+    ["--config-file" "/dev/config.json"] {:options {:config-file "/dev/config.json"}}
     #_()))
 
 (deftest parse