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chore(langchain): require FastMCP 4.0.0b4 for the mcp extra

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`langchain.mcp` targets the FastMCP 4 line. 4.0.0b4 is the first beta whose
client can route to modern-protocol servers through a multi-server config
(jlowin/fastmcp#4893), which is what `MCPAdapter`'s `MCPConfig` support relies
on, so it is the floor rather than 4.0.0b3.

`prerelease = "allow"` under `[tool.uv]` lets the beta resolve.
This commit is contained in:
Sydney Runkle committed 2026-08-26 16:11:41 -07:00
1 parent 9649f8d4bb
commit 472fbc89f7
2 files changed
+87 -20
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libs/langchain_v1/pyproject.toml
+5 -3
View File
@@ -49,7 +49,7 @@ deepseek = ["langchain-deepseek"]
xai = ["langchain-xai"]
perplexity = ["langchain-perplexity"]
meta = ["langchain-meta"]
mcp = ["fastmcp-slim[client]>=3.0.0,<5.0.0"]
mcp = ["fastmcp-slim[client]>=4.0.0b4,<5.0.0"]
[project.urls]
Homepage = "https://docs.langchain.com/"
@@ -76,7 +76,7 @@ test = [
"blockbuster>=1.5.26,<1.6.0",
"langchain-tests>=1.1.9,<2.0.0",
"langchain-openai",
"fastmcp>=3.0.0,<5.0.0",
"fastmcp>=4.0.0b4,<5.0.0",
]
lint = [
"ruff>=0.15.0,<0.17.0",
@@ -84,7 +84,7 @@ lint = [
typing = [
"mypy>=2.1.0,<2.2.0",
"types-toml>=0.10.8.20240310,<1.0.0.0",
"fastmcp>=3.0.0,<5.0.0",
"fastmcp>=4.0.0b4,<5.0.0",
]
test_integration = [
@@ -97,6 +97,8 @@ test_integration = [
[tool.uv]
constraint-dependencies = ["urllib3>=2.6.3", "pygments>=2.20.0"]
# FastMCP 4 is still in beta; allow its prerelease to resolve.
prerelease = "allow"
[tool.uv.sources]
langchain-core = { path = "../core", editable = true }
libs/langchain_v1/uv.lock
Generated
+82 -17
View File
@@ -16,6 +16,9 @@ resolution-markers = [
"python_full_version < '3.11' and platform_python_implementation == 'PyPy'",
]
[options]
prerelease-mode = "allow"
[manifest]
constraints = [
{ name = "pygments", specifier = ">=2.20.0" },
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@@ -2345,7 +2388,7 @@ typing = [
[package.metadata]
requires-dist = [
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{ name = "fastmcp-slim", extras = ["client"], marker = "extra == 'mcp'", specifier = ">=4.0.0b4,<5.0.0" },
{ name = "langchain-anthropic", marker = "extra == 'anthropic'", editable = "../partners/anthropic" },
{ name = "langchain-aws", marker = "extra == 'aws'" },
{ name = "langchain-azure-ai", marker = "extra == 'azure-ai'" },
@@ -2374,7 +2417,7 @@ provides-extras = ["community", "anthropic", "openai", "azure-ai", "google-verte
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{ name = "langchain-tests", editable = "../standard-tests" },
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@@ -2396,7 +2439,7 @@ test-integration = [
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]
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