>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3567467. --> Reported by: [ademarco](https://www.drupal.org/user/186696) Related to !12 >>> <h3 id="summary-problem-motivation">Problem/Motivation</h3> <p>When using the Mistral provider with Canvas AI, requests fail with "422 Unprocessable Entity" while the same request works correctly with the OpenAI provider.</p> <p>The error originates from the php-mistral client. The failure appears to be caused by a tool definition that does not include parameters, which Mistral seems to reject, while other providers accept it. In my case such tool was "ai_agent_verify_task_completion".</p> <h4 id="summary-steps-reproduce">Steps to reproduce</h4> <p>1. Enable canvas_ai.<br> 2. Enable all Canvas AI components so they are available to the agent.<br> 4. In the Canvas editor/agent UI, run a prompt that triggers a tool call, e.g.: "calling the page builder tool first, add a card component with title hello world to the content area"</p> <p>The response we get is the following, which suggests the problem outlined in this ticket.</p> <pre>{<br>&nbsp; "detail" : [ {<br>&nbsp;&nbsp;&nbsp; "type" : "missing",<br>&nbsp;&nbsp;&nbsp; "loc" : [ "body", "tools", "list[Tool]", 4, "function", "parameters" ],<br>&nbsp;&nbsp;&nbsp; "msg" : "Field required",<br>&nbsp;&nbsp;&nbsp; "input" : {<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "name" : "ai_agent_verify_task_completion",<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "description" : "This tool MUST be called ONLY after invoking canvas_page_builder_agent or canvas_template_builder_agent to verify that title and metadata were properly generated if they were empty. DO NOT call this tool for any other operations including canvas_component_agent, general questions, or non-page-building tasks."<br>&nbsp;&nbsp;&nbsp; }<br>&nbsp; }, {<br>&nbsp;&nbsp;&nbsp; "type" : "string_type",<br>&nbsp;&nbsp;&nbsp; "loc" : [ "body", "tools", "list[str]", 0 ],<br>&nbsp;&nbsp;&nbsp; "msg" : "Input should be a valid string",<br>&nbsp;&nbsp;&nbsp; "input" : {<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "type" : "function",<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "function" : {<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "name" : "canvas_component_agent",<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "description" : "This agent can manipulate things in Drupal Canvas. Since it outputs a very specific JSON format, please do not use this in other contexts.",<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "parameters" : {<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "type" : "object",<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "properties" : {<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "prompt" : {<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "name" : "prompt",<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "type" : "string",<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "description" : "Prompt The prompt in natural language on how to invoke this agent."<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; },<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "files" : {<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "name" : "files",<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "type" : "array",<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "description" : "Files The files using file id.",<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "items" : {<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "type" : "string"<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; },<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "required" : [ "prompt" ]<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<br>&nbsp;&nbsp;&nbsp; }<br>&nbsp; }, {<br>&nbsp;&nbsp;&nbsp; "type" : "string_type",<br>&nbsp;&nbsp;&nbsp; "loc" : [ "body", "tools", "list[str]", 1 ],<br>&nbsp;&nbsp;&nbsp; "msg" : "Input should be a valid string",<br>&nbsp;&nbsp;&nbsp; "input" : {<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "type" : "function",<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "function" : {<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "name" : "canvas_metadata_generation_agent",<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "description" : "This agent focuses on generating metadata(meta description) for Drupal Canvas content, as well as for any user-provided content",<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "parameters" : {<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "type" : "object",<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "properties" : {<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "prompt" : {<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "name" : "prompt",<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "type" : "string",<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "description" : "Prompt The prompt in natural language on how to invoke this agent."<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; },<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "files" : {<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "name" : "files",<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "type" : "array",<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "description" : "Files The files using file id.",<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "items" : {<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "type" : "string"<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; },<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "required" : [ "prompt" ]<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<br>&nbsp;&nbsp;&nbsp; }<br>&nbsp; }, {<br>&nbsp;&nbsp;&nbsp; "type" : "string_type",<br>&nbsp;&nbsp;&nbsp; "loc" : [ "body", "tools", "list[str]", 2 ],<br>&nbsp;&nbsp;&nbsp; "msg" : "Input should be a valid string",<br>&nbsp;&nbsp;&nbsp; "input" : {<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "type" : "function",<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "function" : {<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "name" : "canvas_page_builder_agent",<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "description" : "This agent can insert one or many existing components or sections into a specific location on a page. Use this to place a previously created component or section on a layout or page.",<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "parameters" : {<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "type" : "object",<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "properties" : {<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "prompt" : {<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "name" : "prompt",<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "type" : "string",<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "description" : "Prompt The prompt in natural language on how to invoke this agent."<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; },<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "files" : {<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "name" : "files",<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "type" : "array",<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "description" : "Files The files using file id.",<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "items" : {<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "type" : "string"<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; },<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "required" : [ "prompt" ]<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<br>&nbsp;&nbsp;&nbsp; }<br>&nbsp; }, {<br>&nbsp;&nbsp;&nbsp; "type" : "string_type",<br>&nbsp;&nbsp;&nbsp; "loc" : [ "body", "tools", "list[str]", 3 ],<br>&nbsp;&nbsp;&nbsp; "msg" : "Input should be a valid string",<br>&nbsp;&nbsp;&nbsp; "input" : {<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "type" : "function",<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "function" : {<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "name" : "canvas_title_generation_agent",<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "description" : "This agent focuses solely on generating new title and editing existing title for Drupal Canvas. It ensures that the created or edited title matches user-provided guidelines and specifications.",<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "parameters" : {<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "type" : "object",<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "properties" : {<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "prompt" : {<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "name" : "prompt",<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "type" : "string",<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "description" : "Prompt The prompt in natural language on how to invoke this agent."<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; },<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "files" : {<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "name" : "files",<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "type" : "array",<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "description" : "Files The files using file id.",<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "items" : {<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "type" : "string"<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; },<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "required" : [ "prompt" ]<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<br>&nbsp;&nbsp;&nbsp; }<br>&nbsp; }, {<br>&nbsp;&nbsp;&nbsp; "type" : "string_type",<br>&nbsp;&nbsp;&nbsp; "loc" : [ "body", "tools", "list[str]", 4 ],<br>&nbsp;&nbsp;&nbsp; "msg" : "Input should be a valid string",<br>&nbsp;&nbsp;&nbsp; "input" : {<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "type" : "function",<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "function" : {<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "name" : "ai_agent_verify_task_completion",<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "description" : "This tool MUST be called ONLY after invoking canvas_page_builder_agent or canvas_template_builder_agent to verify that title and metadata were properly generated if they were empty. DO NOT call this tool for any other operations including canvas_component_agent, general questions, or non-page-building tasks."<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<br>&nbsp;&nbsp;&nbsp; }<br>&nbsp; } ]<br>}</pre>