Pub/Sub agent testing

Pub/Sub local testing for AI agents

Use LocalCloud when an agent needs to create, exercise, and reset Pub/Sub resources without touching a real Google Cloud project. The same SDK shape points at localhost through PUBSUB_EMULATOR_HOST=localhost:24082.

Read docs Check compatibility SDK examples

Agent prompt CTAs

Pub/Sub local test

Ask an agent to validate Pub/Sub event code locally.

Use LocalCloud to test Pub/Sub locally. Read https://local.cloud/ai/agents.md, set PUBSUB_EMULATOR_HOST=localhost:24082, create a topic and subscription, publish one test message, pull or stream it, ack it, and verify the payload without using real GCP credentials.

Configure this repo

Have an agent wire an existing project to LocalCloud safely.

Set up this repository to use LocalCloud for local GCP development. First read https://local.cloud/ai/agents.md, then inspect this repo, identify the GCP services and SDK language, configure emulator environment variables, and run the narrowest integration test against localhost. Do not use real GCP credentials or production endpoints.

Troubleshoot routing

Diagnose why SDKs or Terraform are still reaching real GCP.

Troubleshoot my LocalCloud setup. Read https://local.cloud/ai/agents.md, check whether Docker and the localcloud container are healthy, verify emulator environment variables are set in this shell/test runner, and identify any SDK or Terraform configuration that could still call real Google Cloud.

Fact

Endpoint: PUBSUB_EMULATOR_HOST=localhost:24082.

Fact

Endpoints: gRPC :24082.

Fact

Evidence state: partial; Local development coverage is partial. Known limits: Schemas, snapshots, seek, dead-letter policy, filters, and other advanced subscription fields are not implemented on the configured endpoint., gcloud and console paths remain partial for advanced Pub/Sub workflows..

Fact

Registry default: on; assembled default: on (verified); minimum tier: community.

Fact

Persistence: volatile (verified). Topics, subscriptions, and messages do not survive emulator/container restart

Agent quickstart

Route the SDK before writing code

Start LocalCloud, export PUBSUB_EMULATOR_HOST=localhost:24082, and make the agent perform one Pub/Sub operation before changing application logic. That catches accidental production routing early.

Validation example

Prefer one representative behavior over broad smoke tests

A useful agent check creates local Pub/Sub state, reads it back with the project SDK, and records which feature was covered. It should not require a GCP account, service-account key, or billing project.

State setup

Use only documented setup paths

Create deterministic state through a contract-documented seed registrar or through an operation listed on this page. Do not assume every service supports seed data, reset, or persistent state.

Copy-ready setup

Commands and prompts

Use these snippets as starting points, then keep the checks scoped to localhost until you intentionally validate against real Google Cloud.

Environment

eval "$(localcloud env)"
# Verify that the generated environment includes PUBSUB_EMULATOR_HOST; do not replace a CLI-remapped value with a hard-coded port.

Compatibility

Local check versus release validation

Area	LocalCloud local check	Real GCP still needed for
SDK routing	PUBSUB_EMULATOR_HOST=localhost:24082 points clients at localhost.	Production endpoint, auth, IAM, quota, and regional behavior.
Supported features	topics.create/get/list/delete (verified); subscriptions.create/get/list/delete (verified); publish/pull/ack/modifyAckDeadline (verified)	Schemas, snapshots, seek, dead-letter policy, filters, and other advanced subscription fields are not implemented on the configured endpoint.; gcloud and console paths remain partial for advanced Pub/Sub workflows.; schemas, snapshots, seek, dead-letter policy: unsupported
Agent safety	No default cloud account, credentials, or billing project required.	Final release validation in the target GCP project.

Limitations

Use the sandbox deliberately

Permitted workflows use local endpoint values and should stop rather than fall back to real Google Cloud or real credentials. The Public Preview License permits individuals and organizations, including for-profit companies, to use LocalCloud for non-production internal development, testing, CI, evaluation, and pilots.
LocalCloud emulates bounded local development workflows. Validate application behavior against real Google Cloud before production deployment.
Before production deployment, unset LocalCloud emulator environment variables and validate behavior against real Google Cloud.
Local development coverage is partial. Known limits: Schemas, snapshots, seek, dead-letter policy, filters, and other advanced subscription fields are not implemented on the configured endpoint., gcloud and console paths remain partial for advanced Pub/Sub workflows..

Next routes

Keep the agent on the supported path

Pub/Sub service page — Service-specific supported and unsupported capability list.
Compatibility matrix — Check current support boundaries before relying on a local-only test.
Service catalog — Review every LocalCloud service, endpoint, and limitation.
SDK examples — Use standard Google Cloud SDKs pointed at localhost.
Seed data — Load deterministic fixtures for repeatable agent and CI runs.

Sources and review

Claims are tied to current sources

LocalCloud service metadata — Reviewed 2026-08-26; implementation google-official.
LocalCloud agentic facts reviewed 2026-08-26.