langchain-delta-registry

28 pay-per-event regulatory, sanctions, procurement, and corporate-registry monitoring tools for LangChain agents, backed by Apify's hosted MCP gateway. Every tool's Pydantic input schema is generated directly from the underlying Apify actor's own real .actor/input_schema.json — never hand-written, so it can't silently drift from what the actor actually accepts.

Install

pip install langchain-delta-registry

Quickstart

import os
os.environ["APIFY_TOKEN"] = "..."  # get one at https://console.apify.com/settings/integrations

from langchain_delta_registry import DELTA_REGISTRY_TOOLS
from langchain.agents import create_agent

agent = create_agent("gpt-4o", tools=DELTA_REGISTRY_TOOLS)

Or import a single tool directly, without loading all 28:

from langchain_delta_registry.actor_19_maritime_sanctions_monitor import actor_19_maritime_sanctions_monitor_tool

result = actor_19_maritime_sanctions_monitor_tool.invoke({"vesselNameContains": "ARTAVIL"})

Authentication

Every tool reads APIFY_TOKEN from the environment at call time — never hardcoded, never passed as a constructor argument, never read from a config file. Get a token from the Apify Console. This library does not issue, broker, or proxy that token in any way; it is sent directly to api.apify.com over HTTPS.

Pricing

Every actor bills strictly per delivered event (pay-per-event) — no subscriptions, no minimum spend. Unchanged records across runs are never re-billed. See each actor's real, current pricing on its Apify Store page — pricing is not duplicated here to avoid it going stale relative to the authoritative source.

Reliability

Every tool call goes through a shared, production-hardened HTTP client (langchain_delta_registry._client): bounded exponential-backoff retry (3 attempts, full jitter) for transient failures (429, 5xx, network errors), no retry for real 4xx client errors, a 320-second timeout (Apify's own real cap on run-sync-get-dataset-items is 300s), and a structured DeltaRegistryAPIError exception carrying the real HTTP status and response body rather than a bare requests exception.

The 28 actors

Also available for

• MCP (Model Context Protocol): io.github.stefanoseggio/delta-registry on the Official MCP Registry, and Smithery.
• OpenAI, Anthropic, Gemini, LlamaIndex, CrewAI, AG2: per-actor tool definitions at https://delta-registry-website.vercel.app/schemas/{actor-slug}/.

Source & regeneration

Every file in src/langchain_delta_registry/ except _client.py is generated by lib/schema-generator/langchain-package-generator.ts in the delta-registry-website repository, from each actor's real, live-verified .actor/input_schema.json. Do not hand-edit a generated file — regenerate it instead, or the next regeneration will silently overwrite your change.

License

Apache-2.0