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feat: add default value support to string, number, and integer schemas #686

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Merged
alexhancock merged 1 commit into from
Feb 26, 2026
+79 −0
Merged

feat: add default value support to string, number, and integer schemas #686

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33 changes: 33 additions & 0 deletions crates/rmcp/src/model/elicitation_schema.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -113,6 +113,10 @@ pub struct StringSchema {
/// String format - limited to: "email", "uri", "date", "date-time"
#[serde(skip_serializing_if = "Option::is_none")]
pub format: Option<StringFormat>,

/// Default value
#[serde(skip_serializing_if = "Option::is_none")]
pub default: Option<String>,
}

impl Default for StringSchema {
Expand All @@ -124,6 +128,7 @@ impl Default for StringSchema {
min_length: None,
max_length: None,
format: None,
default: None,
}
}
}
Expand Down Expand Up @@ -213,6 +218,12 @@ impl StringSchema {
self.format = Some(format);
self
}

/// Set default value
pub fn with_default(mut self, default: impl Into<String>) -> Self {
self.default = Some(default.into());
self
}
}

// =============================================================================
Expand Down Expand Up @@ -246,6 +257,10 @@ pub struct NumberSchema {
/// Maximum value (inclusive)
#[serde(skip_serializing_if = "Option::is_none")]
pub maximum: Option<f64>,

/// Default value
#[serde(skip_serializing_if = "Option::is_none")]
pub default: Option<f64>,
}

impl Default for NumberSchema {
Expand All @@ -256,6 +271,7 @@ impl Default for NumberSchema {
description: None,
minimum: None,
maximum: None,
default: None,
}
}
}
Expand Down Expand Up @@ -307,6 +323,12 @@ impl NumberSchema {
self.description = Some(description.into());
self
}

/// Set default value
pub fn with_default(mut self, default: f64) -> Self {
self.default = Some(default);
self
}
}

// =============================================================================
Expand Down Expand Up @@ -340,6 +362,10 @@ pub struct IntegerSchema {
/// Maximum value (inclusive)
#[serde(skip_serializing_if = "Option::is_none")]
pub maximum: Option<i64>,

/// Default value
#[serde(skip_serializing_if = "Option::is_none")]
pub default: Option<i64>,
}

impl Default for IntegerSchema {
Expand All @@ -350,6 +376,7 @@ impl Default for IntegerSchema {
description: None,
minimum: None,
maximum: None,
default: None,
}
}
}
Expand Down Expand Up @@ -401,6 +428,12 @@ impl IntegerSchema {
self.description = Some(description.into());
self
}

/// Set default value
pub fn with_default(mut self, default: i64) -> Self {
self.default = Some(default);
self
}
}

// =============================================================================
Expand Down
23 changes: 23 additions & 0 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 @@ -1186,6 +1186,14 @@
"description": "Schema definition for integer properties.\n\nCompliant with MCP 2025-06-18 specification for elicitation schemas.\nSupports only the fields allowed by the MCP spec.",
"type": "object",
"properties": {
"default": {
"description": "Default value",
"type": [
"integer",
"null"
],
"format": "int64"
},
"description": {
"description": "Human-readable description",
"type": [
Expand Down Expand Up @@ -1763,6 +1771,14 @@
"description": "Schema definition for number properties (floating-point).\n\nCompliant with MCP 2025-06-18 specification for elicitation schemas.\nSupports only the fields allowed by the MCP spec.",
"type": "object",
"properties": {
"default": {
"description": "Default value",
"type": [
"number",
"null"
],
"format": "double"
},
"description": {
"description": "Human-readable description",
"type": [
Expand Down Expand Up @@ -2869,6 +2885,13 @@
"description": "Schema definition for string properties.\n\nCompliant with MCP 2025-06-18 specification for elicitation schemas.\nSupports only the fields allowed by the MCP spec:\n- format limited to: \"email\", \"uri\", \"date\", \"date-time\"",
"type": "object",
"properties": {
"default": {
"description": "Default value",
"type": [
"string",
"null"
]
},
"description": {
"description": "Human-readable description",
"type": [
Expand Down
23 changes: 23 additions & 0 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 @@ -1186,6 +1186,14 @@
"description": "Schema definition for integer properties.\n\nCompliant with MCP 2025-06-18 specification for elicitation schemas.\nSupports only the fields allowed by the MCP spec.",
"type": "object",
"properties": {
"default": {
"description": "Default value",
"type": [
"integer",
"null"
],
"format": "int64"
},
"description": {
"description": "Human-readable description",
"type": [
Expand Down Expand Up @@ -1763,6 +1771,14 @@
"description": "Schema definition for number properties (floating-point).\n\nCompliant with MCP 2025-06-18 specification for elicitation schemas.\nSupports only the fields allowed by the MCP spec.",
"type": "object",
"properties": {
"default": {
"description": "Default value",
"type": [
"number",
"null"
],
"format": "double"
},
"description": {
"description": "Human-readable description",
"type": [
Expand Down Expand Up @@ -2869,6 +2885,13 @@
"description": "Schema definition for string properties.\n\nCompliant with MCP 2025-06-18 specification for elicitation schemas.\nSupports only the fields allowed by the MCP spec:\n- format limited to: \"email\", \"uri\", \"date\", \"date-time\"",
"type": "object",
"properties": {
"default": {
"description": "Default value",
"type": [
"string",
"null"
]
},
"description": {
"description": "Human-readable description",
"type": [
Expand Down