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feat!: relax tool result structuredContent type (SEP-2106) #919

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feat!: relax tool result structuredContent type (SEP-2106) #919

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4 changes: 2 additions & 2 deletions crates/rmcp/src/model/content.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,7 @@
//! The various content types can be display to humans but also understood by models
//! They include optional annotations used to help inform agent usage
use serde::{Deserialize, Serialize};
use serde_json::json;
use serde_json::{Value, json};

use super::{AnnotateAble, Annotated, resource::ResourceContents};

Expand Down Expand Up @@ -107,7 +107,7 @@ pub struct ToolResultContent {
pub content: Vec<Content>,
/// Optional structured result
#[serde(skip_serializing_if = "Option::is_none")]
pub structured_content: Option<super::JsonObject>,
pub structured_content: Option<Value>,
/// Whether tool execution failed
#[serde(skip_serializing_if = "Option::is_none")]
pub is_error: Option<bool>,
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7 changes: 1 addition & 6 deletions crates/rmcp/tests/test_message_schema/client_json_rpc_message_schema.json
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Original file line number Diff line number Diff line change
Expand Up @@ -2118,12 +2118,7 @@
]
},
"structuredContent": {
"description": "Optional structured result",
"type": [
"object",
"null"
],
"additionalProperties": true
"description": "Optional structured result"
},
"toolUseId": {
"description": "ID of the corresponding tool use",
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7 changes: 1 addition & 6 deletions crates/rmcp/tests/test_message_schema/client_json_rpc_message_schema_current.json
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Original file line number Diff line number Diff line change
Expand Up @@ -2118,12 +2118,7 @@
]
},
"structuredContent": {
"description": "Optional structured result",
"type": [
"object",
"null"
],
"additionalProperties": true
"description": "Optional structured result"
},
"toolUseId": {
"description": "ID of the corresponding tool use",
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7 changes: 1 addition & 6 deletions crates/rmcp/tests/test_message_schema/server_json_rpc_message_schema.json
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Original file line number Diff line number Diff line change
Expand Up @@ -3467,12 +3467,7 @@
]
},
"structuredContent": {
"description": "Optional structured result",
"type": [
"object",
"null"
],
"additionalProperties": true
"description": "Optional structured result"
},
"toolUseId": {
"description": "ID of the corresponding tool use",
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7 changes: 1 addition & 6 deletions crates/rmcp/tests/test_message_schema/server_json_rpc_message_schema_current.json
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Original file line number Diff line number Diff line change
Expand Up @@ -3467,12 +3467,7 @@
]
},
"structuredContent": {
"description": "Optional structured result",
"type": [
"object",
"null"
],
"additionalProperties": true
"description": "Optional structured result"
},
"toolUseId": {
"description": "ID of the corresponding tool use",
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32 changes: 32 additions & 0 deletions crates/rmcp/tests/test_sampling.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -359,6 +359,38 @@ async fn test_tool_result_content_serialization() -> Result<()> {
Ok(())
}

#[tokio::test]
async fn test_tool_result_content_with_array_structured_content() -> Result<()> {
let structured =
serde_json::json!([{ "city": "SF", "temp": 72 }, { "city": "NY", "temp": 65 }]);
let mut tool_result = ToolResultContent::new("call_123", vec![Content::text("forecast")]);
tool_result.structured_content = Some(structured);

let json = serde_json::to_string(&tool_result)?;
let deserialized: ToolResultContent = serde_json::from_str(&json)?;
assert_eq!(tool_result, deserialized);
assert!(deserialized.structured_content.unwrap().is_array());

Ok(())
}

#[tokio::test]
async fn test_tool_result_content_with_primitive_structured_content() -> Result<()> {
let structured = serde_json::json!(42);
let mut tool_result = ToolResultContent::new("call_123", vec![Content::text("count")]);
tool_result.structured_content = Some(structured);

let json = serde_json::to_string(&tool_result)?;
let deserialized: ToolResultContent = serde_json::from_str(&json)?;
assert_eq!(tool_result, deserialized);
assert!(matches!(
deserialized.structured_content,
Some(serde_json::Value::Number(_))
));

Ok(())
}

#[tokio::test]
async fn test_sampling_message_with_tool_use() -> Result<()> {
let message = SamplingMessage::assistant_tool_use(
Expand Down