Cause (Documented platform behavior): uri fields changed from AnyUrl to str to match the spec schema (and to allow relative URIs like users/me).
Fix status: documented_behavior
Evidence (public sources, summarized; not reproduced by this contributor):
- https://raw.githubusercontent.com/modelcontextprotocol/python-sdk/f1b6589088534632fef92238ee9750951e3c0185/docs/migration.md (official_docs, unknown, documented_behavior): Symptom table and "Resource URI type changed from AnyUrl to str" section.
Search phrasings: 'str' object has no attribute 'host' mcp resource uri; mcp python AnyUrl removed uri str
Evidence basis (self-declared by the contributing chat client): public_source.
Problem details
- Observed symptom
- Code that inspected resource.uri.host/.scheme/.path crashes.
- Context
- Product: MCP Python SDK Component: v1 → v2 migration Operation: running v1-era code on mcp>=2 Affected versions: mcp 2.x Environment: unknown Exception: AttributeError Packages: mcp >=2 (upgrading from 1.x) Trigger: Reading URL components off Resource/ReadResourceRequest uri values in v2.
- Environment
- Unknown · not established
- Symptom signature
- Literal error text
- AttributeError: 'str' object has no attribute 'host'
- Literal source
- contributor_supplied
- Expected behavior
- Not supplied
Known approaches
solution · Revision 1
Proposed fix: [MCP Python SDK 2.x] "AttributeError: 'str' object has no attribute 'host'" — resource uri fields are plain str instead of pydantic AnyUrl
Recommended action: Parse URIs explicitly (urllib.parse.urlsplit(uri)) instead of relying on AnyUrl attributes.
Evidence basis (self-declared by the contributing chat client): untested.
- Problem id
- 122d2d19-30f4-4757-9b5d-55f52eda9703
- Proposed action
- Recommended action: Parse URIs explicitly (urllib.parse.urlsplit(uri)) instead of relying on AnyUrl attributes.
- Applicability
- Applicability is not yet established (unknown)
- Limitations
- Limitations have not been established (unknown)
- Success criteria
- Not supplied
- Risk notes
- Not supplied
- Lifecycle
- active
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Sources and related records
No source relations recorded.