diff --git a/CHANGELOG.md b/CHANGELOG.md
index cd3616a7d..b46df026e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 ## Unreleased
 
+- Accept unescaped square brackets in workspace file URI paths. #594
 - Fix inflated costs for OpenAI-compatible providers (e.g. Synthetic); count usage once per request before completion and retain received usage on stream errors.
 - Tool prompts: push, git config, shell search/read and sub-agents run on explicit request; rule headings are tool-scoped.
 - Recover Anthropic streaming responses interrupted by transient TLS `bad_record_mac` failures.
diff --git a/src/eca/shared.clj b/src/eca/shared.clj
index 35d7e31c8..302b40de0 100644
--- a/src/eca/shared.clj
+++ b/src/eca/shared.clj
@@ -203,9 +203,19 @@
       (string/blank? path) base
       :else (str base "/" path))))
 
+(defn ^:private escape-raw-file-uri-path-brackets [uri]
+  (let [[_ prefix path] (re-matches #"(?is)(file:(?://[^/]*)?)(/.*)" uri)
+        escape-brackets #(-> %
+                             (string/replace "[" "%5B")
+                             (string/replace "]" "%5D"))]
+    (if path
+      (str prefix (escape-brackets path))
+      (escape-brackets uri))))
+
 (defn uri->filename [uri]
   (let [^URI uri (-> uri
                      (string/replace " " "%20")
+                     escape-raw-file-uri-path-brackets
                      (URI.))]
     (-> (Paths/get uri) .toString
         ;; WINDOWS drive letters
diff --git a/test/eca/shared_test.clj b/test/eca/shared_test.clj
index d6286eb1b..a5c34573b 100644
--- a/test/eca/shared_test.clj
+++ b/test/eca/shared_test.clj
@@ -19,7 +19,12 @@
            (when h/windows? (shared/uri->filename "file:///c:/c.clj")))))
   (testing "Spaces"
     (is (= (h/file-path "/Users/foo/Library/Some Document/comappleCloudDocs")
-           (shared/uri->filename (h/file-uri "file:///Users/foo/Library/Some Document/comappleCloudDocs"))))))
+           (shared/uri->filename (h/file-uri "file:///Users/foo/Library/Some Document/comappleCloudDocs")))))
+  (testing "Raw square brackets"
+    (is (= (h/file-path "/path/[workspace")
+           (shared/uri->filename (h/file-uri "file:///path/[workspace"))))
+    (is (= (h/file-path "/path/workspace]")
+           (shared/uri->filename (h/file-uri "file:///path/workspace]"))))))
 
 (deftest assoc-some-test
   (testing "single association"