Skip to content

fix: add default values to Literal type fields in content types #1867

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
felixweinberger merged 3 commits into from
Jan 16, 2026
+9 −9
Merged

fix: add default values to Literal type fields in content types #1867

Changes from all commits
Commits
Show all changes
3 commits
Select commit Hold shift + click to select a range
2af18bc
fix: add default values to Literal type fields in content types
felixweinberger Jan 15, 2026
9ccf80e
test: add regression test for content type literal defaults
felixweinberger Jan 16, 2026
bfdb899
remove test_content_type_literal_defaults test
felixweinberger Jan 16, 2026
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
18 changes: 9 additions & 9 deletions src/mcp/types.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -1015,7 +1015,7 @@ class GetPromptRequest(Request[GetPromptRequestParams, Literal["prompts/get"]]):
class TextContent(BaseModel):
"""Text content for a message."""

type: Literal["text"]
type: Literal["text"] = "text"
text: str
"""The text content of the message."""
annotations: Annotations | None = None
Expand All @@ -1030,7 +1030,7 @@ class TextContent(BaseModel):
class ImageContent(BaseModel):
"""Image content for a message."""

type: Literal["image"]
type: Literal["image"] = "image"
data: str
"""The base64-encoded image data."""
mimeType: str
Expand All @@ -1050,7 +1050,7 @@ class ImageContent(BaseModel):
class AudioContent(BaseModel):
"""Audio content for a message."""

type: Literal["audio"]
type: Literal["audio"] = "audio"
data: str
"""The base64-encoded audio data."""
mimeType: str
Expand All @@ -1076,7 +1076,7 @@ class ToolUseContent(BaseModel):
in the next user message.
"""

type: Literal["tool_use"]
type: Literal["tool_use"] = "tool_use"
"""Discriminator for tool use content."""

name: str
Expand Down Expand Up @@ -1104,7 +1104,7 @@ class ToolResultContent(BaseModel):
from the assistant. It contains the output of executing the requested tool.
"""

type: Literal["tool_result"]
type: Literal["tool_result"] = "tool_result"
"""Discriminator for tool result content."""

toolUseId: str
Expand Down Expand Up @@ -1171,7 +1171,7 @@ class EmbeddedResource(BaseModel):
of the LLM and/or the user.
"""

type: Literal["resource"]
type: Literal["resource"] = "resource"
resource: TextResourceContents | BlobResourceContents
annotations: Annotations | None = None
meta: dict[str, Any] | None = Field(alias="_meta", default=None)
Expand All @@ -1189,7 +1189,7 @@ class ResourceLink(Resource):
Note: resource links returned by tools are not guaranteed to appear in the results of `resources/list` requests.
"""

type: Literal["resource_link"]
type: Literal["resource_link"] = "resource_link"


ContentBlock = TextContent | ImageContent | AudioContent | ResourceLink | EmbeddedResource
Expand Down Expand Up @@ -1580,7 +1580,7 @@ def content_as_list(self) -> list[SamplingMessageContentBlock]:
class ResourceTemplateReference(BaseModel):
"""A reference to a resource or resource template definition."""

type: Literal["ref/resource"]
type: Literal["ref/resource"] = "ref/resource"
uri: str
"""The URI or URI template of the resource."""
model_config = ConfigDict(extra="allow")
Expand All @@ -1589,7 +1589,7 @@ class ResourceTemplateReference(BaseModel):
class PromptReference(BaseModel):
"""Identifies a prompt."""

type: Literal["ref/prompt"]
type: Literal["ref/prompt"] = "ref/prompt"
name: str
"""The name of the prompt or prompt template"""
model_config = ConfigDict(extra="allow")
Expand Down