[JS] Schema validation failed when using a tool

[marcelpinto]

Describe the bug
I have a flow with a prompt defined with dotpromt with a json schema as output. When not using any tool the flow works fine, but when I added a tool the flow is failling because the Schema validation fails when the model replies that needs to use a tool.

To Reproduce

1. Create a prompt with JSON schema
2. Create a tool
3. Make a request that forces the model to use the tool.

Expected behavior
GenKit handles the tool calling, calls the tool and calls again the model with the result.

Actual behavior
The flow fails with:

Candidate[0] Error: INVALID_ARGUMENT: Schema validation failed. Parse Errors:

- (root): must be object

Provided data:

null

Required JSON schema:
...

Runtime (please complete the following information):
MacOS

** Node version
v20.15.0

Additional context
I tried to use the returnToolRequests: true, to handle the reply myself but the same issue happens since the check is on the model reply.

See trace logs:
b198423822c2d17f302dbd4674c0b6cc.txt

[MichaelDoyle]

Thanks for reporting. Can you re-upload the trace as plain text? I am unable to read it.

[marcelpinto]

I saw that it had a weird format, but I just used the "export trace > save" option in the UI. Maybe another issue to report.

In any case, here is the trace.

I think the issue is in the generate.ts at the candidateError check:

genkit/js/ai/src/generate.ts

Line 668 in 2f6c7d8

if (c.text() === '' && c.data() === null) return null;

if (c.text() === "" && c.data() === null) return null

c.data() is actually undefined. If I switch to:

if (c.text() === "" && !c.data()) return null

Then it works fine.

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                "exception.type": "Error",
                "exception.message": "FAILED_PRECONDITION: Generation resulted in no candidates matching provided output schema.\n\nCandidate[0] Error: INVALID_ARGUMENT: Schema validation failed. Parse Errors:\n\n- (root): must be object\n\nProvided data:\n\nnull\n\nRequired JSON schema:\n\n{\n  \"type\": \"object\",\n  \"properties\": {\n    \"type\": {\n      \"type\": \"string\",\n      \"enum\": [\n        \"question\",\n        \"update\",\n        \"add\",\n        \"remove\",\n        \"breakdown\"\n      ],\n      \"description\": \"The type of reply:\\n- question: the user asked a question and this is the reply.\\n - update: a task was updated.\\n - add: a task was added.\\n - remove: a task was removed.\\n - breakdown: a task was broken down.\"\n    },\n    \"text\": {\n      \"type\": \"string\",\n      \"description\": \"The reply to the user message\"\n    },\n    \"transcript\": {\n      \"type\": [\n        \"string\",\n        \"null\"\n      ],\n      \"description\": \"The transcript of the user message, if the input was a voice message\"\n    },\n    \"suggestions\": {\n      \"anyOf\": [\n        {\n          \"type\": \"array\",\n          \"items\": {\n            \"type\": \"object\",\n            \"properties\": {\n              \"text\": {\n                \"type\": \"string\",\n                \"description\": \"The text of the suggestion to show to the user\"\n              },\n              \"type\": {\n                \"type\": \"string\",\n                \"enum\": [\n                  \"full\",\n                  \"partial\",\n                  \"action\"\n                ],\n                \"description\": \"The type of the suggestion:\\n- full: The full text to reply directly\\n- partial: The starting of the reply to be completed by the user\\n- action: An action to be taken\"\n              },\n              \"action\": {\n                \"type\": \"string\",\n                \"enum\": [\n                  \"question\",\n                  \"update\",\n                  \"add\",\n                  \"remove\",\n                  \"breakdown\"\n                ],\n                \"description\": \"The type of reply:\\n- question: the user asked a question and this is the reply.\\n - update: a task was updated.\\n - add: a task was added.\\n - remove: a task was removed.\\n - breakdown: a task was broken down.\"\n              }\n            },\n            \"required\": [\n              \"text\",\n              \"type\",\n              \"action\"\n            ],\n            \"additionalProperties\": true\n          },\n          \"description\": \"A set of flow up suggestions for the reply\"\n        },\n        {\n          \"type\": \"null\"\n        }\n      ],\n      \"description\": \"A set of flow up suggestions for the reply\"\n    },\n    \"taskId\": {\n      \"type\": [\n        \"string\",\n        \"null\"\n      ],\n      \"description\": \"The task ID the reply type is associated with, or none if not applicable\"\n    }\n  },\n  \"required\": [\n    \"type\",\n    \"text\"\n  ],\n  \"additionalProperties\": true,\n  \"$schema\": \"http://json-schema.org/draft-07/schema#\"\n}",
                "exception.stacktrace": "Error: FAILED_PRECONDITION: Generation resulted in no candidates matching provided output schema.\n\nCandidate[0] Error: INVALID_ARGUMENT: Schema validation failed. Parse Errors:\n\n- (root): must be object\n\nProvided data:\n\nnull\n\nRequired JSON schema:\n\n{\n  \"type\": \"object\",\n  \"properties\": {\n    \"type\": {\n      \"type\": \"string\",\n      \"enum\": [\n        \"question\",\n        \"update\",\n        \"add\",\n        \"remove\",\n        \"breakdown\"\n      ],\n      \"description\": \"The type of reply:\\n- question: the user asked a question and this is the reply.\\n - update: a task was updated.\\n - add: a task was added.\\n - remove: a task was removed.\\n - breakdown: a task was broken down.\"\n    },\n    \"text\": {\n      \"type\": \"string\",\n      \"description\": \"The reply to the user message\"\n    },\n    \"transcript\": {\n      \"type\": [\n        \"string\",\n        \"null\"\n      ],\n      \"description\": \"The transcript of the user message, if the input was a voice message\"\n    },\n    \"suggestions\": {\n      \"anyOf\": [\n        {\n          \"type\": \"array\",\n          \"items\": {\n            \"type\": \"object\",\n            \"properties\": {\n              \"text\": {\n                \"type\": \"string\",\n                \"description\": \"The text of the suggestion to show to the user\"\n              },\n              \"type\": {\n                \"type\": \"string\",\n                \"enum\": [\n                  \"full\",\n                  \"partial\",\n                  \"action\"\n                ],\n                \"description\": \"The type of the suggestion:\\n- full: The full text to reply directly\\n- partial: The starting of the reply to be completed by the user\\n- action: An action to be taken\"\n              },\n              \"action\": {\n                \"type\": \"string\",\n                \"enum\": [\n                  \"question\",\n                  \"update\",\n                  \"add\",\n                  \"remove\",\n                  \"breakdown\"\n                ],\n                \"description\": \"The type of reply:\\n- question: the user asked a question and this is the reply.\\n - update: a task was updated.\\n - add: a task was added.\\n - remove: a task was removed.\\n - breakdown: a task was broken down.\"\n              }\n            },\n            \"required\": [\n              \"text\",\n              \"type\",\n              \"action\"\n            ],\n            \"additionalProperties\": true\n          },\n          \"description\": \"A set of flow up suggestions for the reply\"\n        },\n        {\n          \"type\": \"null\"\n        }\n      ],\n      \"description\": \"A set of flow up suggestions for the reply\"\n    },\n    \"taskId\": {\n      \"type\": [\n        \"string\",\n        \"null\"\n      ],\n      \"description\": \"The task ID the reply type is associated with, or none if not applicable\"\n    }\n  },\n  \"required\": [\n    \"type\",\n    \"text\"\n  ],\n  \"additionalProperties\": true,\n  \"$schema\": \"http://json-schema.org/draft-07/schema#\"\n}\n    at /Users/marcel/Dev/GitHub/mumble-sort/functions/node_modules/@genkit-ai/ai/lib/generate.js:563:15\n    at Generator.next (<anonymous>)\n    at fulfilled (/Users/marcel/Dev/GitHub/mumble-sort/functions/node_modules/@genkit-ai/ai/lib/generate.js:43:24)\n    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)"
              },
              "description": "exception"
            }
          }
        ]
      }
    }
  }
}