MeshFlow Contracts

Shared Pydantic contracts used by Core, Gateway, and MeshFlow apps.

Rule of thumb: if a model is only used by one app, it does not belong here.

Installation

0.2.3 is published on PyPI and is the currently supported line: pip install "meshflow-contracts~=0.2.3".

0.3.0 is prepared but not yet published. Consumers must not assume it is available, and must not adopt it before its public wheel, sdist, hashes, and provenance are verified.

Maintainers: use the package-specific release and adoption runbook.

External ingress manifests

Apps may declare optional generic external ingress capabilities through AppManifest.external_ingress. Each entry fixes the audience, private upstream path, methods, content types, scopes, body limit, and rate policy that platform services may snapshot and enforce. The contract describes policy only; it does not route traffic or authorize grants.

Manifests that omit external_ingress remain valid and declare no external ingress capabilities.

External ingress policy is intentionally conservative for Core/Gateway snapshots: internal upstream paths must be canonical absolute app-internal paths, capability ids are unique per manifest, methods are limited to GET, POST, PUT, and DELETE, and numeric limits are strict integers. Contract safety caps are 100 MiB per request body, 1,000 requests per window, and 3,600 seconds per rate window.

Integration request tokens

IntegrationRequestClaims defines the shared internal JWT payload Gateway sends only to private app ingress after Core has validated an integration grant. The contract adds token_type="integration_request" without changing existing app_request or lifecycle token claims.

The claims model requires workspace, installation, app/audience, capability, grant, subject user, request, jti, immutable scopes, and strict integer iat / exp values. App id and audience must match, token lifetime is capped at 3,600 seconds, undeclared claims are rejected, and validated copies re-run the same invariants. JWT registered claims keep their JWT semantics: iss accepts a case-sensitive non-empty StringOrURI, including HTTPS URIs and arbitrary human-readable no-colon issuer strings, while sub and jti are case-sensitive opaque URL-safe strings rather than MeshFlow identifiers. This package validates claim shape only; cryptographic verification and equality to the configured issuer remain runtime responsibilities alongside signing, minting, JWKS validation, replay handling, routing, lifecycle status, error taxonomy, and grant persistence.

0.3.0 rollout notes

0.3.0 removes service.base_url from AppManifest. The manifest now describes app identity only; the upstream address is a deployment binding supplied separately at registration time. Consumers must migrate their own manifest producers before adopting.

ServiceDefinition stays tolerant of unknown keys on purpose. Registry manifest snapshots are immutable and hashed at write time, and Core parses them on the read path, so a snapshot written by 0.2.x has to keep parsing. Refusing a newly submitted manifest that still carries base_url is a registration-time policy check in Core, not a contract-level rule.

Core adopts the verified package before Gateway; the schema upgrade alone does not enable runtime capabilities.

The failed v0.2.0, v0.2.1, and v0.2.2 tags are immutable unpublished history. They must never be moved, reused, published, or turned into GitHub Releases.

• Apps that omit external_ingress preserve 0.1.0 parse/serialize behavior; omission grants no public ingress.
• Registration and runtime rollout depend on Core/Gateway adopting their own snapshot, introspection, routing, and policy-enforcement behavior.
• Core/Gateway must ignore external_ingress until their own snapshot, introspection, routing, and policy-enforcement work lands.
• Apps must ignore integration_request until they implement private external ingress consumers; existing browser and lifecycle paths keep using app_request and lifecycle semantics.
• No Core, Gateway, or app domain behavior is enabled solely by upgrading this package.

Packaging metadata, licensing, source-level checks, strict artifact inspection, and wheel/sdist smoke tests are enforced by release CI before consumer adoption.

License

Licensed under the Apache License 2.0. See LICENSE.

Copyright 2026 MeshFlow contributors.