feat: add default value support to elicitation schemas (SEP-1034) - #533

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bug-ops wants to merge 4 commits into
modelcontextprotocol:mainfrom
bug-ops:feat/sep-1034-default-values
Closed

feat: add default value support to elicitation schemas (SEP-1034)#533
bug-ops wants to merge 4 commits into
modelcontextprotocol:mainfrom
bug-ops:feat/sep-1034-default-values

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Summary

Implements modelcontextprotocol/modelcontextprotocol#1034 by adding optional default value support to StringSchema, NumberSchema, and EnumSchema in elicitation schemas.

Motivation

Resolves#521

Currently, users must manually enter information that could be pre-populated with sensible defaults, creating unnecessary friction in interactive tool workflows. For example, in an email reply tool, recipient and CC information from the email thread context should be automatically populated rather than requiring manual re-entry.

Changes

  • StringSchema: Added optional default: Option<Cow<'static, str>> field with with_default() builder method
  • NumberSchema: Added optional default: Option field with with_default() builder method
  • EnumSchema: Added optional default: Option field with with_default() builder method
  • Added comprehensive test coverage (8 new tests) for default value serialization, deserialization, and backward compatibility
  • Updated elicitation_stdio.rs example to demonstrate default values usage in a practical email reply scenario

Implementation Details:

  • Follows the existing BooleanSchema pattern for consistency
  • All defaults are optional (Option) for backward compatibility
  • Uses #[serde(skip_serializing_if = "Option::is_none")] to ensure old clients can safely ignore the new field
  • Type-safe: Rust's type system ensures defaults match their schema types

Example Usage

let schema = ElicitationSchema::builder().string_property("recipient", |s| {
s.format(StringFormat::Email).with_default("sender@example.com").description("Email recipient")}).number_property("confidence", |n| {
n.range(0.0,1.0).with_default(0.8).description("Reply confidence score")}).build()?;
  • Bug fix (non-breaking change which fixes an issue)
  • New feature (non-breaking change which adds functionality)
  • Breaking change (fix or feature that would cause existing functionality to change)
  • Documentation update

Checklist

  • I have read the MCP Documentation
  • My code follows the repository's style guidelines
  • New and existing tests pass locally
  • I have added appropriate error handling
  • I have added or updated documentation as needed

Implement optional default values for StringSchema, NumberSchema, and EnumSchema
following the BooleanSchema pattern. This allows forms to be pre-populated with
sensible defaults, improving user experience in elicitation workflows.
Changes:
- Add optional `default` field to StringSchema (Cow<'static, str>)
- Add optional `default` field to NumberSchema (f64)
- Add optional `default` field to EnumSchema (String)
- Add `with_default()` builder methods to all three schemas
- Add comprehensive tests for default value serialization and deserialization
- Update elicitation example to demonstrate default values usage
All defaults are optional (Option<T>) for backward compatibility and use
skip_serializing_if to ensure old clients ignore the new field.
@github-actionsgithub-actionsBot added T-core Core library changes T-examples Example code changes T-model Model/data structure changes labels Nov 9, 2025
- Update server JSON RPC message schema with new default fields
- Apply code formatting to elicitation example
@github-actionsgithub-actionsBot added T-test Testing related changes T-config Configuration file changes labels Nov 9, 2025
@bug-ops

This comment was marked as outdated.

Extract and display all fields from elicitation response including cc, body,
and confidence in addition to previously shown recipient, subject, and priority fields.
@bug-ops
bug-ops marked this pull request as ready for review November 14, 2025 13:03
Use default values from schema (sender@example.com, team@example.com, 0.8)
instead of hardcoded fallback values when user doesn't provide input.
@bug-ops
bug-ops marked this pull request as draft November 15, 2025 14:09
@bug-ops

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ContributorAuthor

will be completed in pr #539

@bug-opsbug-ops closed this Nov 17, 2025
@bug-ops
bug-ops deleted the feat/sep-1034-default-values branch November 17, 2025 13:22
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Implement SEP-1034: Default Values for Elicitation Schemas

1 participant

@bug-ops
, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '
Skip to content

feat: add default value support to elicitation schemas (SEP-1034) - #533

Closed
bug-ops wants to merge 4 commits into
modelcontextprotocol:mainfrom
bug-ops:feat/sep-1034-default-values
Closed

feat: add default value support to elicitation schemas (SEP-1034)#533
bug-ops wants to merge 4 commits into
modelcontextprotocol:mainfrom
bug-ops:feat/sep-1034-default-values

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Summary

Implements modelcontextprotocol/modelcontextprotocol#1034 by adding optional default value support to StringSchema, NumberSchema, and EnumSchema in elicitation schemas.

Motivation

Resolves#521

Currently, users must manually enter information that could be pre-populated with sensible defaults, creating unnecessary friction in interactive tool workflows. For example, in an email reply tool, recipient and CC information from the email thread context should be automatically populated rather than requiring manual re-entry.

Changes

  • StringSchema: Added optional default: Option<Cow<'static, str>> field with with_default() builder method
  • NumberSchema: Added optional default: Option field with with_default() builder method
  • EnumSchema: Added optional default: Option field with with_default() builder method
  • Added comprehensive test coverage (8 new tests) for default value serialization, deserialization, and backward compatibility
  • Updated elicitation_stdio.rs example to demonstrate default values usage in a practical email reply scenario

Implementation Details:

  • Follows the existing BooleanSchema pattern for consistency
  • All defaults are optional (Option) for backward compatibility
  • Uses #[serde(skip_serializing_if = "Option::is_none")] to ensure old clients can safely ignore the new field
  • Type-safe: Rust's type system ensures defaults match their schema types

Example Usage

let schema = ElicitationSchema::builder().string_property("recipient", |s| {
s.format(StringFormat::Email).with_default("sender@example.com").description("Email recipient")}).number_property("confidence", |n| {
n.range(0.0,1.0).with_default(0.8).description("Reply confidence score")}).build()?;
  • Bug fix (non-breaking change which fixes an issue)
  • New feature (non-breaking change which adds functionality)
  • Breaking change (fix or feature that would cause existing functionality to change)
  • Documentation update

Checklist

  • I have read the MCP Documentation
  • My code follows the repository's style guidelines
  • New and existing tests pass locally
  • I have added appropriate error handling
  • I have added or updated documentation as needed

Implement optional default values for StringSchema, NumberSchema, and EnumSchema
following the BooleanSchema pattern. This allows forms to be pre-populated with
sensible defaults, improving user experience in elicitation workflows.
Changes:
- Add optional `default` field to StringSchema (Cow<'static, str>)
- Add optional `default` field to NumberSchema (f64)
- Add optional `default` field to EnumSchema (String)
- Add `with_default()` builder methods to all three schemas
- Add comprehensive tests for default value serialization and deserialization
- Update elicitation example to demonstrate default values usage
All defaults are optional (Option<T>) for backward compatibility and use
skip_serializing_if to ensure old clients ignore the new field.
@github-actionsgithub-actionsBot added T-core Core library changes T-examples Example code changes T-model Model/data structure changes labels Nov 9, 2025
- Update server JSON RPC message schema with new default fields
- Apply code formatting to elicitation example
@github-actionsgithub-actionsBot added T-test Testing related changes T-config Configuration file changes labels Nov 9, 2025
@bug-ops

This comment was marked as outdated.

Extract and display all fields from elicitation response including cc, body,
and confidence in addition to previously shown recipient, subject, and priority fields.
@bug-ops
bug-ops marked this pull request as ready for review November 14, 2025 13:03
Use default values from schema (sender@example.com, team@example.com, 0.8)
instead of hardcoded fallback values when user doesn't provide input.
@bug-ops
bug-ops marked this pull request as draft November 15, 2025 14:09
@bug-ops

Copy link
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ContributorAuthor

will be completed in pr #539

@bug-opsbug-ops closed this Nov 17, 2025
@bug-ops
bug-ops deleted the feat/sep-1034-default-values branch November 17, 2025 13:22
Sign up for freeto join this conversation on GitHub. Already have an account? Sign in to comment

Labels

T-configConfiguration file changesT-coreCore library changesT-examplesExample code changesT-modelModel/data structure changesT-testTesting related changes

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Development

Successfully merging this pull request may close these issues.

Implement SEP-1034: Default Values for Elicitation Schemas

1 participant

@bug-ops
, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix"); } } catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + '
Skip to content

feat: add default value support to elicitation schemas (SEP-1034) - #533

Closed
bug-ops wants to merge 4 commits into
modelcontextprotocol:mainfrom
bug-ops:feat/sep-1034-default-values
Closed

feat: add default value support to elicitation schemas (SEP-1034)#533
bug-ops wants to merge 4 commits into
modelcontextprotocol:mainfrom
bug-ops:feat/sep-1034-default-values

Conversation

@bug-ops

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Summary

Implements modelcontextprotocol/modelcontextprotocol#1034 by adding optional default value support to StringSchema, NumberSchema, and EnumSchema in elicitation schemas.

Motivation

Resolves#521

Currently, users must manually enter information that could be pre-populated with sensible defaults, creating unnecessary friction in interactive tool workflows. For example, in an email reply tool, recipient and CC information from the email thread context should be automatically populated rather than requiring manual re-entry.

Changes

  • StringSchema: Added optional default: Option<Cow<'static, str>> field with with_default() builder method
  • NumberSchema: Added optional default: Option field with with_default() builder method
  • EnumSchema: Added optional default: Option field with with_default() builder method
  • Added comprehensive test coverage (8 new tests) for default value serialization, deserialization, and backward compatibility
  • Updated elicitation_stdio.rs example to demonstrate default values usage in a practical email reply scenario

Implementation Details:

  • Follows the existing BooleanSchema pattern for consistency
  • All defaults are optional (Option) for backward compatibility
  • Uses #[serde(skip_serializing_if = "Option::is_none")] to ensure old clients can safely ignore the new field
  • Type-safe: Rust's type system ensures defaults match their schema types

Example Usage

let schema = ElicitationSchema::builder().string_property("recipient", |s| {
s.format(StringFormat::Email).with_default("sender@example.com").description("Email recipient")}).number_property("confidence", |n| {
n.range(0.0,1.0).with_default(0.8).description("Reply confidence score")}).build()?;
  • Bug fix (non-breaking change which fixes an issue)
  • New feature (non-breaking change which adds functionality)
  • Breaking change (fix or feature that would cause existing functionality to change)
  • Documentation update

Checklist

  • I have read the MCP Documentation
  • My code follows the repository's style guidelines
  • New and existing tests pass locally
  • I have added appropriate error handling
  • I have added or updated documentation as needed

Implement optional default values for StringSchema, NumberSchema, and EnumSchema
following the BooleanSchema pattern. This allows forms to be pre-populated with
sensible defaults, improving user experience in elicitation workflows.
Changes:
- Add optional `default` field to StringSchema (Cow<'static, str>)
- Add optional `default` field to NumberSchema (f64)
- Add optional `default` field to EnumSchema (String)
- Add `with_default()` builder methods to all three schemas
- Add comprehensive tests for default value serialization and deserialization
- Update elicitation example to demonstrate default values usage
All defaults are optional (Option<T>) for backward compatibility and use
skip_serializing_if to ensure old clients ignore the new field.
@github-actionsgithub-actionsBot added T-core Core library changes T-examples Example code changes T-model Model/data structure changes labels Nov 9, 2025
- Update server JSON RPC message schema with new default fields
- Apply code formatting to elicitation example
@github-actionsgithub-actionsBot added T-test Testing related changes T-config Configuration file changes labels Nov 9, 2025
@bug-ops

This comment was marked as outdated.

Extract and display all fields from elicitation response including cc, body,
and confidence in addition to previously shown recipient, subject, and priority fields.
@bug-ops
bug-ops marked this pull request as ready for review November 14, 2025 13:03
Use default values from schema (sender@example.com, team@example.com, 0.8)
instead of hardcoded fallback values when user doesn't provide input.
@bug-ops
bug-ops marked this pull request as draft November 15, 2025 14:09
@bug-ops

Copy link
Copy Markdown
ContributorAuthor

will be completed in pr #539

@bug-opsbug-ops closed this Nov 17, 2025
@bug-ops
bug-ops deleted the feat/sep-1034-default-values branch November 17, 2025 13:22
Sign up for freeto join this conversation on GitHub. Already have an account? Sign in to comment

Labels

T-configConfiguration file changesT-coreCore library changesT-examplesExample code changesT-modelModel/data structure changesT-testTesting related changes

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Development

Successfully merging this pull request may close these issues.

Implement SEP-1034: Default Values for Elicitation Schemas

1 participant

@bug-ops
, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms"); } } catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + '
Skip to content

feat: add default value support to elicitation schemas (SEP-1034) - #533

Closed
bug-ops wants to merge 4 commits into
modelcontextprotocol:mainfrom
bug-ops:feat/sep-1034-default-values
Closed

feat: add default value support to elicitation schemas (SEP-1034)#533
bug-ops wants to merge 4 commits into
modelcontextprotocol:mainfrom
bug-ops:feat/sep-1034-default-values

Conversation

@bug-ops

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Summary

Implements modelcontextprotocol/modelcontextprotocol#1034 by adding optional default value support to StringSchema, NumberSchema, and EnumSchema in elicitation schemas.

Motivation

Resolves#521

Currently, users must manually enter information that could be pre-populated with sensible defaults, creating unnecessary friction in interactive tool workflows. For example, in an email reply tool, recipient and CC information from the email thread context should be automatically populated rather than requiring manual re-entry.

Changes

  • StringSchema: Added optional default: Option<Cow<'static, str>> field with with_default() builder method
  • NumberSchema: Added optional default: Option field with with_default() builder method
  • EnumSchema: Added optional default: Option field with with_default() builder method
  • Added comprehensive test coverage (8 new tests) for default value serialization, deserialization, and backward compatibility
  • Updated elicitation_stdio.rs example to demonstrate default values usage in a practical email reply scenario

Implementation Details:

  • Follows the existing BooleanSchema pattern for consistency
  • All defaults are optional (Option) for backward compatibility
  • Uses #[serde(skip_serializing_if = "Option::is_none")] to ensure old clients can safely ignore the new field
  • Type-safe: Rust's type system ensures defaults match their schema types

Example Usage

let schema = ElicitationSchema::builder().string_property("recipient", |s| {
s.format(StringFormat::Email).with_default("sender@example.com").description("Email recipient")}).number_property("confidence", |n| {
n.range(0.0,1.0).with_default(0.8).description("Reply confidence score")}).build()?;
  • Bug fix (non-breaking change which fixes an issue)
  • New feature (non-breaking change which adds functionality)
  • Breaking change (fix or feature that would cause existing functionality to change)
  • Documentation update

Checklist

  • I have read the MCP Documentation
  • My code follows the repository's style guidelines
  • New and existing tests pass locally
  • I have added appropriate error handling
  • I have added or updated documentation as needed

Implement optional default values for StringSchema, NumberSchema, and EnumSchema
following the BooleanSchema pattern. This allows forms to be pre-populated with
sensible defaults, improving user experience in elicitation workflows.
Changes:
- Add optional `default` field to StringSchema (Cow<'static, str>)
- Add optional `default` field to NumberSchema (f64)
- Add optional `default` field to EnumSchema (String)
- Add `with_default()` builder methods to all three schemas
- Add comprehensive tests for default value serialization and deserialization
- Update elicitation example to demonstrate default values usage
All defaults are optional (Option<T>) for backward compatibility and use
skip_serializing_if to ensure old clients ignore the new field.
@github-actionsgithub-actionsBot added T-core Core library changes T-examples Example code changes T-model Model/data structure changes labels Nov 9, 2025
- Update server JSON RPC message schema with new default fields
- Apply code formatting to elicitation example
@github-actionsgithub-actionsBot added T-test Testing related changes T-config Configuration file changes labels Nov 9, 2025
@bug-ops

This comment was marked as outdated.

Extract and display all fields from elicitation response including cc, body,
and confidence in addition to previously shown recipient, subject, and priority fields.
@bug-ops
bug-ops marked this pull request as ready for review November 14, 2025 13:03
Use default values from schema (sender@example.com, team@example.com, 0.8)
instead of hardcoded fallback values when user doesn't provide input.
@bug-ops
bug-ops marked this pull request as draft November 15, 2025 14:09
@bug-ops

Copy link
Copy Markdown
ContributorAuthor

will be completed in pr #539

@bug-opsbug-ops closed this Nov 17, 2025
@bug-ops
bug-ops deleted the feat/sep-1034-default-values branch November 17, 2025 13:22
Sign up for freeto join this conversation on GitHub. Already have an account? Sign in to comment

Labels

T-configConfiguration file changesT-coreCore library changesT-examplesExample code changesT-modelModel/data structure changesT-testTesting related changes

Projects

None yet

Development

Successfully merging this pull request may close these issues.

Implement SEP-1034: Default Values for Elicitation Schemas

1 participant

@bug-ops
, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links"); } } catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); } })(); (function(){ try { var __m = "youtube.com"; var __re = new RegExp('^' + "youtube\\.com" + '
Skip to content

feat: add default value support to elicitation schemas (SEP-1034) - #533

Closed
bug-ops wants to merge 4 commits into
modelcontextprotocol:mainfrom
bug-ops:feat/sep-1034-default-values
Closed

feat: add default value support to elicitation schemas (SEP-1034)#533
bug-ops wants to merge 4 commits into
modelcontextprotocol:mainfrom
bug-ops:feat/sep-1034-default-values

Conversation

@bug-ops

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Copy Markdown
Contributor

Summary

Implements modelcontextprotocol/modelcontextprotocol#1034 by adding optional default value support to StringSchema, NumberSchema, and EnumSchema in elicitation schemas.

Motivation

Resolves#521

Currently, users must manually enter information that could be pre-populated with sensible defaults, creating unnecessary friction in interactive tool workflows. For example, in an email reply tool, recipient and CC information from the email thread context should be automatically populated rather than requiring manual re-entry.

Changes

  • StringSchema: Added optional default: Option<Cow<'static, str>> field with with_default() builder method
  • NumberSchema: Added optional default: Option field with with_default() builder method
  • EnumSchema: Added optional default: Option field with with_default() builder method
  • Added comprehensive test coverage (8 new tests) for default value serialization, deserialization, and backward compatibility
  • Updated elicitation_stdio.rs example to demonstrate default values usage in a practical email reply scenario

Implementation Details:

  • Follows the existing BooleanSchema pattern for consistency
  • All defaults are optional (Option) for backward compatibility
  • Uses #[serde(skip_serializing_if = "Option::is_none")] to ensure old clients can safely ignore the new field
  • Type-safe: Rust's type system ensures defaults match their schema types

Example Usage

let schema = ElicitationSchema::builder().string_property("recipient", |s| {
s.format(StringFormat::Email).with_default("sender@example.com").description("Email recipient")}).number_property("confidence", |n| {
n.range(0.0,1.0).with_default(0.8).description("Reply confidence score")}).build()?;
  • Bug fix (non-breaking change which fixes an issue)
  • New feature (non-breaking change which adds functionality)
  • Breaking change (fix or feature that would cause existing functionality to change)
  • Documentation update

Checklist

  • I have read the MCP Documentation
  • My code follows the repository's style guidelines
  • New and existing tests pass locally
  • I have added appropriate error handling
  • I have added or updated documentation as needed

Implement optional default values for StringSchema, NumberSchema, and EnumSchema
following the BooleanSchema pattern. This allows forms to be pre-populated with
sensible defaults, improving user experience in elicitation workflows.
Changes:
- Add optional `default` field to StringSchema (Cow<'static, str>)
- Add optional `default` field to NumberSchema (f64)
- Add optional `default` field to EnumSchema (String)
- Add `with_default()` builder methods to all three schemas
- Add comprehensive tests for default value serialization and deserialization
- Update elicitation example to demonstrate default values usage
All defaults are optional (Option<T>) for backward compatibility and use
skip_serializing_if to ensure old clients ignore the new field.
@github-actionsgithub-actionsBot added T-core Core library changes T-examples Example code changes T-model Model/data structure changes labels Nov 9, 2025
- Update server JSON RPC message schema with new default fields
- Apply code formatting to elicitation example
@github-actionsgithub-actionsBot added T-test Testing related changes T-config Configuration file changes labels Nov 9, 2025
@bug-ops

This comment was marked as outdated.

Extract and display all fields from elicitation response including cc, body,
and confidence in addition to previously shown recipient, subject, and priority fields.
@bug-ops
bug-ops marked this pull request as ready for review November 14, 2025 13:03
Use default values from schema (sender@example.com, team@example.com, 0.8)
instead of hardcoded fallback values when user doesn't provide input.
@bug-ops
bug-ops marked this pull request as draft November 15, 2025 14:09
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will be completed in pr #539

@bug-opsbug-ops closed this Nov 17, 2025
@bug-ops
bug-ops deleted the feat/sep-1034-default-values branch November 17, 2025 13:22
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Implement SEP-1034: Default Values for Elicitation Schemas

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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default"); } } catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + '
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feat: add default value support to elicitation schemas (SEP-1034) - #533

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bug-ops wants to merge 4 commits into
modelcontextprotocol:mainfrom
bug-ops:feat/sep-1034-default-values
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feat: add default value support to elicitation schemas (SEP-1034)#533
bug-ops wants to merge 4 commits into
modelcontextprotocol:mainfrom
bug-ops:feat/sep-1034-default-values

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Summary

Implements modelcontextprotocol/modelcontextprotocol#1034 by adding optional default value support to StringSchema, NumberSchema, and EnumSchema in elicitation schemas.

Motivation

Resolves#521

Currently, users must manually enter information that could be pre-populated with sensible defaults, creating unnecessary friction in interactive tool workflows. For example, in an email reply tool, recipient and CC information from the email thread context should be automatically populated rather than requiring manual re-entry.

Changes

  • StringSchema: Added optional default: Option<Cow<'static, str>> field with with_default() builder method
  • NumberSchema: Added optional default: Option field with with_default() builder method
  • EnumSchema: Added optional default: Option field with with_default() builder method
  • Added comprehensive test coverage (8 new tests) for default value serialization, deserialization, and backward compatibility
  • Updated elicitation_stdio.rs example to demonstrate default values usage in a practical email reply scenario

Implementation Details:

  • Follows the existing BooleanSchema pattern for consistency
  • All defaults are optional (Option) for backward compatibility
  • Uses #[serde(skip_serializing_if = "Option::is_none")] to ensure old clients can safely ignore the new field
  • Type-safe: Rust's type system ensures defaults match their schema types

Example Usage

let schema = ElicitationSchema::builder().string_property("recipient", |s| {
s.format(StringFormat::Email).with_default("sender@example.com").description("Email recipient")}).number_property("confidence", |n| {
n.range(0.0,1.0).with_default(0.8).description("Reply confidence score")}).build()?;
  • Bug fix (non-breaking change which fixes an issue)
  • New feature (non-breaking change which adds functionality)
  • Breaking change (fix or feature that would cause existing functionality to change)
  • Documentation update

Checklist

  • I have read the MCP Documentation
  • My code follows the repository's style guidelines
  • New and existing tests pass locally
  • I have added appropriate error handling
  • I have added or updated documentation as needed

Implement optional default values for StringSchema, NumberSchema, and EnumSchema
following the BooleanSchema pattern. This allows forms to be pre-populated with
sensible defaults, improving user experience in elicitation workflows.
Changes:
- Add optional `default` field to StringSchema (Cow<'static, str>)
- Add optional `default` field to NumberSchema (f64)
- Add optional `default` field to EnumSchema (String)
- Add `with_default()` builder methods to all three schemas
- Add comprehensive tests for default value serialization and deserialization
- Update elicitation example to demonstrate default values usage
All defaults are optional (Option<T>) for backward compatibility and use
skip_serializing_if to ensure old clients ignore the new field.
@github-actionsgithub-actionsBot added T-core Core library changes T-examples Example code changes T-model Model/data structure changes labels Nov 9, 2025
- Update server JSON RPC message schema with new default fields
- Apply code formatting to elicitation example
@github-actionsgithub-actionsBot added T-test Testing related changes T-config Configuration file changes labels Nov 9, 2025
@bug-ops

This comment was marked as outdated.

Extract and display all fields from elicitation response including cc, body,
and confidence in addition to previously shown recipient, subject, and priority fields.
@bug-ops
bug-ops marked this pull request as ready for review November 14, 2025 13:03
Use default values from schema (sender@example.com, team@example.com, 0.8)
instead of hardcoded fallback values when user doesn't provide input.
@bug-ops
bug-ops marked this pull request as draft November 15, 2025 14:09
@bug-ops

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ContributorAuthor

will be completed in pr #539

@bug-opsbug-ops closed this Nov 17, 2025
@bug-ops
bug-ops deleted the feat/sep-1034-default-values branch November 17, 2025 13:22
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Labels

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Successfully merging this pull request may close these issues.

Implement SEP-1034: Default Values for Elicitation Schemas

1 participant

@bug-ops
, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers"); } } catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + '
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feat: add default value support to elicitation schemas (SEP-1034) - #533

Closed
bug-ops wants to merge 4 commits into
modelcontextprotocol:mainfrom
bug-ops:feat/sep-1034-default-values
Closed

feat: add default value support to elicitation schemas (SEP-1034)#533
bug-ops wants to merge 4 commits into
modelcontextprotocol:mainfrom
bug-ops:feat/sep-1034-default-values

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Summary

Implements modelcontextprotocol/modelcontextprotocol#1034 by adding optional default value support to StringSchema, NumberSchema, and EnumSchema in elicitation schemas.

Motivation

Resolves#521

Currently, users must manually enter information that could be pre-populated with sensible defaults, creating unnecessary friction in interactive tool workflows. For example, in an email reply tool, recipient and CC information from the email thread context should be automatically populated rather than requiring manual re-entry.

Changes

  • StringSchema: Added optional default: Option<Cow<'static, str>> field with with_default() builder method
  • NumberSchema: Added optional default: Option field with with_default() builder method
  • EnumSchema: Added optional default: Option field with with_default() builder method
  • Added comprehensive test coverage (8 new tests) for default value serialization, deserialization, and backward compatibility
  • Updated elicitation_stdio.rs example to demonstrate default values usage in a practical email reply scenario

Implementation Details:

  • Follows the existing BooleanSchema pattern for consistency
  • All defaults are optional (Option) for backward compatibility
  • Uses #[serde(skip_serializing_if = "Option::is_none")] to ensure old clients can safely ignore the new field
  • Type-safe: Rust's type system ensures defaults match their schema types

Example Usage

let schema = ElicitationSchema::builder().string_property("recipient", |s| {
s.format(StringFormat::Email).with_default("sender@example.com").description("Email recipient")}).number_property("confidence", |n| {
n.range(0.0,1.0).with_default(0.8).description("Reply confidence score")}).build()?;
  • Bug fix (non-breaking change which fixes an issue)
  • New feature (non-breaking change which adds functionality)
  • Breaking change (fix or feature that would cause existing functionality to change)
  • Documentation update

Checklist

  • I have read the MCP Documentation
  • My code follows the repository's style guidelines
  • New and existing tests pass locally
  • I have added appropriate error handling
  • I have added or updated documentation as needed

Implement optional default values for StringSchema, NumberSchema, and EnumSchema
following the BooleanSchema pattern. This allows forms to be pre-populated with
sensible defaults, improving user experience in elicitation workflows.
Changes:
- Add optional `default` field to StringSchema (Cow<'static, str>)
- Add optional `default` field to NumberSchema (f64)
- Add optional `default` field to EnumSchema (String)
- Add `with_default()` builder methods to all three schemas
- Add comprehensive tests for default value serialization and deserialization
- Update elicitation example to demonstrate default values usage
All defaults are optional (Option<T>) for backward compatibility and use
skip_serializing_if to ensure old clients ignore the new field.
@github-actionsgithub-actionsBot added T-core Core library changes T-examples Example code changes T-model Model/data structure changes labels Nov 9, 2025
- Update server JSON RPC message schema with new default fields
- Apply code formatting to elicitation example
@github-actionsgithub-actionsBot added T-test Testing related changes T-config Configuration file changes labels Nov 9, 2025
@bug-ops

This comment was marked as outdated.

Extract and display all fields from elicitation response including cc, body,
and confidence in addition to previously shown recipient, subject, and priority fields.
@bug-ops
bug-ops marked this pull request as ready for review November 14, 2025 13:03
Use default values from schema (sender@example.com, team@example.com, 0.8)
instead of hardcoded fallback values when user doesn't provide input.
@bug-ops
bug-ops marked this pull request as draft November 15, 2025 14:09
@bug-ops

Copy link
Copy Markdown
ContributorAuthor

will be completed in pr #539

@bug-opsbug-ops closed this Nov 17, 2025
@bug-ops
bug-ops deleted the feat/sep-1034-default-values branch November 17, 2025 13:22
Sign up for freeto join this conversation on GitHub. Already have an account? Sign in to comment

Labels

T-configConfiguration file changesT-coreCore library changesT-examplesExample code changesT-modelModel/data structure changesT-testTesting related changes

Projects

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Development

Successfully merging this pull request may close these issues.

Implement SEP-1034: Default Values for Elicitation Schemas

1 participant

@bug-ops
, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode"); } } catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); } })(); })();
Skip to content

feat: add default value support to elicitation schemas (SEP-1034) - #533

Closed
bug-ops wants to merge 4 commits into
modelcontextprotocol:mainfrom
bug-ops:feat/sep-1034-default-values
Closed

feat: add default value support to elicitation schemas (SEP-1034)#533
bug-ops wants to merge 4 commits into
modelcontextprotocol:mainfrom
bug-ops:feat/sep-1034-default-values

Conversation

@bug-ops

Copy link
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Contributor

Summary

Implements modelcontextprotocol/modelcontextprotocol#1034 by adding optional default value support to StringSchema, NumberSchema, and EnumSchema in elicitation schemas.

Motivation

Resolves#521

Currently, users must manually enter information that could be pre-populated with sensible defaults, creating unnecessary friction in interactive tool workflows. For example, in an email reply tool, recipient and CC information from the email thread context should be automatically populated rather than requiring manual re-entry.

Changes

  • StringSchema: Added optional default: Option<Cow<'static, str>> field with with_default() builder method
  • NumberSchema: Added optional default: Option field with with_default() builder method
  • EnumSchema: Added optional default: Option field with with_default() builder method
  • Added comprehensive test coverage (8 new tests) for default value serialization, deserialization, and backward compatibility
  • Updated elicitation_stdio.rs example to demonstrate default values usage in a practical email reply scenario

Implementation Details:

  • Follows the existing BooleanSchema pattern for consistency
  • All defaults are optional (Option) for backward compatibility
  • Uses #[serde(skip_serializing_if = "Option::is_none")] to ensure old clients can safely ignore the new field
  • Type-safe: Rust's type system ensures defaults match their schema types

Example Usage

let schema = ElicitationSchema::builder().string_property("recipient", |s| {
s.format(StringFormat::Email).with_default("sender@example.com").description("Email recipient")}).number_property("confidence", |n| {
n.range(0.0,1.0).with_default(0.8).description("Reply confidence score")}).build()?;
  • Bug fix (non-breaking change which fixes an issue)
  • New feature (non-breaking change which adds functionality)
  • Breaking change (fix or feature that would cause existing functionality to change)
  • Documentation update

Checklist

  • I have read the MCP Documentation
  • My code follows the repository's style guidelines
  • New and existing tests pass locally
  • I have added appropriate error handling
  • I have added or updated documentation as needed

Implement optional default values for StringSchema, NumberSchema, and EnumSchema
following the BooleanSchema pattern. This allows forms to be pre-populated with
sensible defaults, improving user experience in elicitation workflows.
Changes:
- Add optional `default` field to StringSchema (Cow<'static, str>)
- Add optional `default` field to NumberSchema (f64)
- Add optional `default` field to EnumSchema (String)
- Add `with_default()` builder methods to all three schemas
- Add comprehensive tests for default value serialization and deserialization
- Update elicitation example to demonstrate default values usage
All defaults are optional (Option<T>) for backward compatibility and use
skip_serializing_if to ensure old clients ignore the new field.
@github-actionsgithub-actionsBot added T-core Core library changes T-examples Example code changes T-model Model/data structure changes labels Nov 9, 2025
- Update server JSON RPC message schema with new default fields
- Apply code formatting to elicitation example
@github-actionsgithub-actionsBot added T-test Testing related changes T-config Configuration file changes labels Nov 9, 2025
@bug-ops

This comment was marked as outdated.

Extract and display all fields from elicitation response including cc, body,
and confidence in addition to previously shown recipient, subject, and priority fields.
@bug-ops
bug-ops marked this pull request as ready for review November 14, 2025 13:03
Use default values from schema (sender@example.com, team@example.com, 0.8)
instead of hardcoded fallback values when user doesn't provide input.
@bug-ops
bug-ops marked this pull request as draft November 15, 2025 14:09
@bug-ops

Copy link
Copy Markdown
ContributorAuthor

will be completed in pr #539

@bug-opsbug-ops closed this Nov 17, 2025
@bug-ops
bug-ops deleted the feat/sep-1034-default-values branch November 17, 2025 13:22
Sign up for freeto join this conversation on GitHub. Already have an account? Sign in to comment

Labels

T-configConfiguration file changesT-coreCore library changesT-examplesExample code changesT-modelModel/data structure changesT-testTesting related changes

Projects

None yet

Development

Successfully merging this pull request may close these issues.

Implement SEP-1034: Default Values for Elicitation Schemas

1 participant

@bug-ops