https://modelcontextprotocol.io/specification/2025-06-18/schema#calltoolresult
isError?: boolean
Whether the tool call ended in an error.
If not set, this is assumed to be false (the call was successful).
However -
|
Assert.notNull(isError, "isError must not be null"); |
invoked by
|
@JsonProperty("isError") Boolean isError, @JsonProperty("structuredContent") Object structuredContent, |
do not treat the JSON property as optional.
I found this when trying to connect to https://docs.confluent.io/cloud/current/ai/ai-tools/managed-mcp-server.html#global-and-regional-mcp-servers - https://api.confluent.cloud/mcp/v1 using
final HttpClientStreamableHttpTransport.Builder transportBuilder =
HttpClientStreamableHttpTransport.builder(url).endpoint(url)
.clientBuilder(httpClientBuilder);Note .endpoint(url) needed because the confluent servers don't end in /mcp
https://modelcontextprotocol.io/specification/2025-06-18/schema#calltoolresult
However -
java-sdk/mcp-core/src/main/java/io/modelcontextprotocol/spec/McpSchema.java
Line 3333 in 8ee8ccb
invoked by
java-sdk/mcp-core/src/main/java/io/modelcontextprotocol/spec/McpSchema.java
Line 3216 in 8ee8ccb
do not treat the JSON property as optional.
I found this when trying to connect to https://docs.confluent.io/cloud/current/ai/ai-tools/managed-mcp-server.html#global-and-regional-mcp-servers - https://api.confluent.cloud/mcp/v1 using
Note
.endpoint(url)needed because the confluent servers don't end in/mcp