{"slug":"oip-vs-langchain-tools","title":"OIP vs LangChain Tools","body":"## Introduction to OIP vs LangChain Tools\nOIP (Object Invocation Protocol) is a protocol specification that defines a work object as a unit of invocation, whereas LangChain tools are code-bound abstractions that operate on data.\n## Comparison of OIP and LangChain Tools\nOIP operates on data-bound directory rows, whereas LangChain tools are bound to code.\n## Receipt Rule\nThe receipt rule for OIP is that every invocation appends to the ledger and returns a receipt at `/api/dispatch?receipt=inv_ID`.\n## Conformance Rule\nThe conformance rule for OIP is that every object must be invoked using the `POST /api/dispatch` or `GET /api/dispatch?invoke=KEY&body=...` route, and must return a receipt at `/api/dispatch?receipt=inv_ID`.\n## Example\nAn example of using OIP to invoke an object is to use the `curl` command to send a `POST` request to `https://miscsubjects.com/api/dispatch` with a JSON body containing the key and body of the object.","hero":null,"images":[],"style":{"accent":"#16324f","measure":860},"tags":["oip","object-invocation-protocol","protocol-specification","machine-native-json","dynamic"],"model":null,"ledger":null,"embeds":[],"widgets":[{"type":"stat","value":1,"label":"version"},{"type":"note","title":"Zero-context rule","text":"A reader should understand the protocol unit, object contract, invocation route, receipt schema, and repair path from this page plus its machine bundle."},{"type":"note","title":"Machine-native rule","text":"The JSON is the executable map: object, routes, inputs, proof loop, ledger, and next article to open."}],"home":false,"claims":[{"id":"oip-c1","tier":"system","text":"The OIP article layer is generated from live directory rows, so it documents the objects that actually run the reference implementation.","who_claims":"system/oip_articles","source_ids":["oip-s3","oip-s4"]},{"id":"oip-c2","tier":"system","text":"The OIP operating path is caller to directory object to dispatch runner to invocation ledger to receipt.","who_claims":"system/oip_articles","source_ids":["oip-s1"]},{"id":"oip-c3","tier":"system","text":"Every executable capability in the reference implementation is reachable as an OIP object with a human article, a machine document, invocation history, and receipt path.","who_claims":"system/oip_articles","source_ids":["oip-s2","oip-s3"]},{"id":"oip-c4","tier":"system","text":"Tap & Go is the copy primitive: one drop carries credential, protocol, tree, search, execute, and receipt instructions without a separate token-map-bundle assembly step.","who_claims":"system/oip_articles","source_ids":["oip-s2"]},{"id":"oip-c5","tier":"system","text":"OIP receipts are the proof object for actions: they record request, response, actor, links, replay, repair, and lineage.","who_claims":"system/oip_articles","source_ids":["oip-s2","oip-s5"]}],"sources":[{"id":"oip-s1","type":"protocol","title":"BUILD_SPEC object invocation 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