release(fireworks): 1.7.0 (#40889)

Prepare the `langchain-fireworks` **1.7.0 minor release**, up from
1.6.3, for prompt-caching middleware support.

- Raise the existing `langchain` test dependency minimum to
`>=1.4.3,<2.0.0` for fallback-safe prompt caching; `langchain` remains a
lazy, optional runtime import, not a required package dependency.
- Refresh the lockfile for Fireworks 1.7.0 and LangChain 1.4.3,
including the latter's current package metadata. No publishing is
performed by this PR.

### PRs included since 1.6.3

- [#38823](https://github.com/langchain-ai/langchain/pull/38823): Add
prompt caching middleware.
- [#40874](https://github.com/langchain-ai/langchain/pull/40874):
Classify mid-stream read timeouts.
- [#40833](https://github.com/langchain-ai/langchain/pull/40833):
Refresh model profile data.

Existing lockfile caveat: `uv` warns that `pydantic==2.12.1` and
`pydantic-core==2.41.3` are yanked (the former references the latter;
the latter had a corrupted wheel upload). Those versions are unchanged
by this release PR.

Made by [Open SWE](https://github.com/langchain-ai/open-swe) · [view
thread](https://openswe.langchain.dev/agents/c2dee156-b2b1-573e-8f59-e498d251ae49)
· openai:gpt-6-astra (medium)

Co-authored-by: Mason Daugherty <mdrxy@users.noreply.github.com>
Co-authored-by: open-swe[bot] <open-swe@users.noreply.github.com>

libs/partners/fireworks/langchain_fireworks/_version.py

@@ -1,3 +1,3 @@
 """Version information for `langchain-fireworks`."""
 
-__version__ = "1.6.3"
+__version__ = "1.7.0"

libs/partners/fireworks/pyproject.toml

@@ -20,7 +20,7 @@ classifiers = [
     "Topic :: Scientific/Engineering :: Artificial Intelligence",
 ]
 
-version = "1.6.3"
+version = "1.7.0"
 requires-python = ">=3.10.0,<4.0.0"
 dependencies = [
     "langchain-core>=1.6.5,<2.0.0",
@@ -52,7 +52,7 @@ test = [
     "pytest-socket>=0.7.0,<1.0.0",
     "pytest-xdist>=3.8.0,<4.0.0",
     "langchain-tests>=1.1.9,<2.0.0",
-    "langchain>=1.0.0,<2.0.0",
+    "langchain>=1.4.3,<2.0.0",
 ]
 test_integration = []
 lint = ["ruff>=0.13.1,<0.14.0"]

libs/partners/fireworks/uv.lock

@@ -817,7 +817,7 @@ wheels = [
 
 [[package]]
 name = "langchain"
-version = "1.3.18"
+version = "1.4.3"
 source = { editable = "../../langchain_v1" }
 dependencies = [
     { name = "langchain-core" },
@@ -827,6 +827,7 @@ dependencies = [
 
 [package.metadata]
 requires-dist = [
+    { name = "fastmcp", marker = "extra == 'mcp'", specifier = ">=4.0.1,<5.0.0" },
     { name = "langchain-anthropic", marker = "extra == 'anthropic'", editable = "../anthropic" },
     { name = "langchain-aws", marker = "extra == 'aws'" },
     { name = "langchain-azure-ai", marker = "extra == 'azure-ai'" },
@@ -849,12 +850,13 @@ requires-dist = [
     { name = "langgraph", specifier = ">=1.2.11,<1.3.0" },
     { name = "pydantic", specifier = ">=2.7.4,<3.0.0" },
 ]
-provides-extras = ["community", "anthropic", "openai", "azure-ai", "google-vertexai", "google-genai", "fireworks", "ollama", "together", "mistralai", "huggingface", "groq", "aws", "baseten", "deepseek", "xai", "perplexity", "meta"]
+provides-extras = ["community", "anthropic", "openai", "azure-ai", "google-vertexai", "google-genai", "fireworks", "ollama", "together", "mistralai", "huggingface", "groq", "aws", "baseten", "deepseek", "xai", "perplexity", "meta", "mcp"]
 
 [package.metadata.requires-dev]
 lint = [{ name = "ruff", specifier = ">=0.15.0,<0.17.0" }]
 test = [
     { name = "blockbuster", specifier = ">=1.5.26,<1.6.0" },
+    { name = "fastmcp", specifier = ">=4.0.1,<5.0.0" },
     { name = "langchain-openai", editable = "../openai" },
     { name = "langchain-tests", editable = "../../standard-tests" },
     { name = "pytest", specifier = ">=9.0.3,<10.0.0" },
@@ -876,6 +878,7 @@ test-integration = [
     { name = "wrapt", specifier = ">=1.15.0,<3.0.0" },
 ]
 typing = [
+    { name = "fastmcp", specifier = ">=4.0.1,<5.0.0" },
     { name = "mypy", specifier = ">=2.1.0,<2.2.0" },
     { name = "types-toml", specifier = ">=0.10.8.20240310,<1.0.0.0" },
 ]
@@ -946,7 +949,7 @@ typing = [
 
 [[package]]
 name = "langchain-fireworks"
-version = "1.6.3"
+version = "1.7.0"
 source = { editable = "." }
 dependencies = [
     { name = "aiohttp" },