gatecore-langchain
gatecore-langchain provides three LangChain tools for GateCore marketplace discovery and
procurement, plus helpers that execute a procured capability through GateCore's signed gateway.
The adapter contains transport and configuration only; GateCore services enforce identity,
policy, trust, pricing, funding, delegation, and settlement.
The MCP tools support public full-mode GateCore endpoints only. read mode passes the server's
fail-closed procurement error through unchanged. off mode is unsupported because it does not
replace the adapter's legacy placeholder identity with the MCP credential identity.
Install from the GateCore monorepo
python -m pip install -e ./libs/sdk -e ./libs/adapters/gatecore-langchain
Install from PyPI (effective on publish)
Effective once gatecore-sdk and this package have a real PyPI release — see
.github/workflows/publish-pypi.yml. Until then, use the monorepo install above.
python -m pip install gatecore-langchain
Configuration
Discovery and procurement require:
GATECORE_MCP_URL=https://mcp.example.com/mcp
GATECORE_MCP_KEY=gcmk_...
execute_procured and aexecute_procured validate these variables lazily on first use:
GATECORE_GATEWAY_URL=https://api.example.com
GATECORE_BEARER_TOKEN=...
GATECORE_AGENT_ID=agent:example
GATECORE_ACCESS_GRANT_ID=grant:example
GATECORE_KEY_ID=key:example
GATECORE_PRIVATE_KEY_PATH=/secure/path/agent-key.pem
Set exactly one of GATECORE_PRIVATE_KEY_PATH or GATECORE_PRIVATE_KEY_PEM.
Usage
from gatecore_langchain import GateCoreToolkit, execute_procured
tools = GateCoreToolkit().get_tools()
procure_result = tools[2].invoke({"listing_id": "listing:example"})
decision = execute_procured(procure_result, {"query": "example"})
All tools are async-native through LangChain's async invocation methods. Their synchronous bridge
uses asyncio.run() and therefore must not be called from a thread that already owns a running
event loop; use ainvoke() in async applications.
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