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feat(@langchain/core): migrate subset of agent primitives to @langchain/core #9179

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Parent: feat: Add Semantic Text Splitter
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feat(@langchain/core): migrate subset of agent primitives to @langchain/core #9179

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ad529e8
feat(langchain/createAgent): add before/after agent hooks
christian-bromann Oct 13, 2025
d8e302c
chore(langchain): move middleware primitives to core
christian-bromann Oct 13, 2025
d4489ad
cr
christian-bromann Oct 14, 2025
fc9df52
cr
christian-bromann Oct 14, 2025
0a358dc
add more wrapToolCall tests
christian-bromann Oct 14, 2025
99a485a
document middleware sub export
christian-bromann Oct 14, 2025
2e5581c
cr
christian-bromann Oct 14, 2025
24189f4
fix dep range tests
christian-bromann Oct 14, 2025
189501b
cr
christian-bromann Oct 14, 2025
ba4645d
cr
christian-bromann Oct 14, 2025
c0c8f7a
Update libs/providers/langchain-anthropic/package.json
christian-bromann Oct 14, 2025
120800d
mark exports as internal
christian-bromann Oct 14, 2025
f585e8b
trying to fix things
christian-bromann Oct 14, 2025
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1 change: 1 addition & 0 deletions dependency_range_tests/docker-compose.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,7 @@ services:
working_dir: /app
volumes:
- ../libs/langchain:/langchain
- ../libs/langchain-core:/libs/langchain-core
- ../libs/langchain-textsplitters:/libs/langchain-textsplitters
- ../libs/providers/langchain-openai:/libs/langchain-openai
- ../libs/providers/langchain-anthropic:/libs/langchain-anthropic
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5 changes: 2 additions & 3 deletions dependency_range_tests/scripts/langchain/node/update_resolutions_latest.js
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Expand Up @@ -27,11 +27,10 @@ const workspaceDependencies = [

for (const [depName, depVersion] of workspaceDependencies) {
/**
* for the peer dependency @langchain/core, we want to make sure to install max version
* defined above
* for the peer dependency @langchain/core, we will link to the workspace dependency
*/
if (depName === "@langchain/core") {
delete currentPackageJson.devDependencies[depName];
currentPackageJson.devDependencies[depName] = `file:/libs/langchain-core`;
continue;
}

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19 changes: 15 additions & 4 deletions dependency_range_tests/scripts/langchain/node/update_resolutions_lowest.js
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I think this is just invalidating the point of dep tests. Fine to either disable for this pass, but I think the fix for the latest tests is to allow for pre-release versions if thats what's in dependencies (since we're just pnpm add @langchain/core'ing within the script)

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yes, ideally we need to be able to push dev releases from branches and then adjust the peer dep in langchain.

Original file line number Diff line number Diff line change
Expand Up @@ -17,10 +17,21 @@ if (
const minVersion = semver.minVersion(
currentPackageJson.peerDependencies["@langchain/core"]
).version;
currentPackageJson.peerDependencies = {
...currentPackageJson.peerDependencies,
"@langchain/core": minVersion,
};

// Check if the minimum version matches the workspace version
const corePackageJsonPath = "/libs/langchain-core/package.json";
const corePackageJson = JSON.parse(fs.readFileSync(corePackageJsonPath));

if (corePackageJson.version === minVersion) {
currentPackageJson.pnpm.overrides[
"@langchain/core"
] = `file:/libs/langchain-core`;
} else {
currentPackageJson.peerDependencies = {
...currentPackageJson.peerDependencies,
"@langchain/core": minVersion,
};
}
}

/**
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11 changes: 8 additions & 3 deletions examples/src/createAgent/middleware/promptCaching.ts
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Original file line number Diff line number Diff line change
@@ -1,11 +1,16 @@
import { createAgent, HumanMessage, AIMessage } from "langchain";
import { anthropicPromptCachingMiddleware } from "langchain";
import {
createAgent,
HumanMessage,
AIMessage,
type AgentMiddleware,
} from "langchain";
import { promptCachingMiddleware } from "@langchain/anthropic";

// Example usage
const agent = createAgent({
model: "anthropic:claude-sonnet-4-20250514",
tools: [],
middleware: [anthropicPromptCachingMiddleware({ ttl: "5m" })] as const,
middleware: [promptCachingMiddleware({ ttl: "5m" }) as AgentMiddleware],
});

// Usage example with a long chat history for testing caching
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4 changes: 2 additions & 2 deletions libs/langchain-classic/package.json
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Expand Up @@ -119,7 +119,7 @@
"lunary": "^0.8.8",
"mariadb": "^3.4.0",
"mem0ai": "^2.1.8",
"mongodb": "^6.17.0",
"mongodb": "^6.20.0",
"openai": "^5.1.0",
"peggy": "^3.0.2",
"pg": "^8.16.3",
Expand Down Expand Up @@ -1230,4 +1230,4 @@
},
"./package.json": "./package.json"
}
}
}
4 changes: 2 additions & 2 deletions libs/langchain-community/package.json
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Expand Up @@ -172,7 +172,7 @@
"mammoth": "^1.6.0",
"mariadb": "^3.4.0",
"mem0ai": "^2.1.8",
"mongodb": "^6.17.0",
"mongodb": "^6.20.0",
"mysql2": "^3.9.8",
"neo4j-driver": "^5.17.0",
"node-llama-cpp": "3.1.1",
Expand Down Expand Up @@ -3435,4 +3435,4 @@
"files": [
"dist/"
]
}
}
13 changes: 12 additions & 1 deletion libs/langchain-core/package.json
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Expand Up @@ -319,6 +319,17 @@
},
"input": "./src/memory.ts"
},
"./middleware": {
"require": {
"types": "./dist/middleware/index.d.cts",
"default": "./dist/middleware/index.cjs"
},
"import": {
"types": "./dist/middleware/index.d.ts",
"default": "./dist/middleware/index.js"
},
"input": "./src/middleware/index.ts"
},
"./messages": {
"require": {
"types": "./dist/messages/index.d.cts",
Expand Down Expand Up @@ -720,4 +731,4 @@
"files": [
"dist/"
]
}
}
1 change: 1 addition & 0 deletions libs/langchain-core/src/load/import_map.ts
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Expand Up @@ -21,6 +21,7 @@ export * as language_models__chat_models from "../language_models/chat_models.js
export * as language_models__llms from "../language_models/llms.js";
export * as load__serializable from "../load/serializable.js";
export * as memory from "../memory.js";
export * as middleware from "../middleware/index.js";
export * as messages from "../messages/index.js";
export * as messages__tool from "../messages/tool.js";
export * as output_parsers from "../output_parsers/index.js";
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