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+;;; kaagum --- Tiny, security-focused AI agent in Guile
+;;; Copyright © 2026 Arun Isaac <arunisaac@systemreboot.net>
+;;;
+;;; This file is part of kaagum.
+;;;
+;;; kaagum is free software: you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation, either version 3 of the License, or
+;;; (at your option) any later version.
+;;;
+;;; kaagum is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;;; General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with kaagum.  If not, see <https://www.gnu.org/licenses/>.
+
+(use-modules (srfi srfi-64)
+             (kaagum tools))
+
+(test-begin "tools")
+
+(test-equal "tool call with parameter type mismatch must error out"
+  "Error: Argument arg of invalid type"
+  (guard (c ((tool-call-parse-failure? c)
+             (tool-call-parse-failure-message c)))
+    (spec->tool-call "foo"
+                     "/foo/bar"
+                     `(("read" . ,(tool #:description "A dummy test tool"
+                                        #:parameters `(("arg" . ,(tool-parameter
+                                                                  #:description "an argument"
+                                                                  #:type "integer"
+                                                                  #:required? #t)))
+                                        #:proc identity
+                                        #:title identity
+                                        #:kind "read")))
+                     (list "read")
+                     (list)
+                     `(("id" . "foo123")
+                       ("type" . "function")
+                       ("function"
+                        ("name" . "read")
+                        ("arguments" . "{\"arg\": \"[738\"}"))))))
+
+(test-end "tools")