Agent Platform Architecture
GoogleOfficialPublished by Google
- Skill
- Tool integration
- Cloud and DevOps
- Apache-2.0
- Low risk
AutoGineer summary
Written by AutoGineer from the skill’s own files, not by the author
This skill provides a structured framework for architecting and managing enterprise Gemini platform environments. It covers multi-project hierarchies, secure network connectivity via Agent Connectivity Templates (ACT), and advanced governance using Unified Access Policies (UAP) and Model Armor. It is designed for engineers building scalable, zero-trust agent platforms that require specific egress patterns, identity management, and cross-cloud integration.
What it does
- Designs multi-project hierarchies including Host, Governance Hub, and Runtime Spokes.
- Configures Agent Connectivity Templates for ALL_TRAFFIC or PRIVATE_RANGES_ONLY egress.
- Implements security guardrails using Model Armor and Unified Access Policies (UAP V2).
- Sets up identity and token exchange using SPIFFE and 3P IdP integration.
- Manages Day-2 lifecycle operations for agent runtimes and connectivity templates.
- Validates architecture through a structured 3-phase deployment and audit process.
When to use it
- When designing the network and security topology for a new enterprise Gemini platform.
- When configuring secure egress and ingress patterns for agent-to-service communication.
- When implementing cross-project governance and identity boundaries.
- When troubleshooting connectivity or policy enforcement issues in a Gemini platform stack.
Advantages
- Provides a standardized, repeatable approach to complex platform architecture.
- Ensures adherence to zero-trust principles and least-privilege IAM.
- Reduces configuration drift through clear, domain-specific reference manuals.
- Supports complex requirements like hybrid mTLS and cross-cloud egress hubs.
Usage examples
- “Design a multi-project hierarchy for a Gemini platform with a central governance hub and separate runtime spokes.”
- The agent will outline the project structure, VPC layout, and IAM bootstrap requirements for the requested hierarchy.
- “How do I configure an Agent Connectivity Template for ALL_TRAFFIC egress?”
- The agent will provide the specific YAML manifest and CLI commands to configure the ACT with the required egress mode.
Install
Download the skill as a ZIP:
https://mp-staging.autogineer.com/agent-skills/google/agent-platform-architecture/downloadUnzip it into the cross-client skills folder of your project:
mkdir -p .agents/skills && unzip agent-platform-architecture.zip -d .agents/skills
Documentation by Google
Gemini platform Architecture and Engineering Guide
This skill is the reference system for designing, engineering, and validating enterprise-grade Gemini platform architectures across multi-project hierarchies, hybrid/cross-cloud networks, zero-trust identity boundaries, and inline safety/policy enforcement planes.
Usage Attribution
MUST READ: Before executing any gcloud, REST API, or MCP command, you
MUST read and follow the instructions in
Usage Attribution.
[!IMPORTANT] Architectural Scope and Reference Discipline: Use
SKILL.mdto select the target topology, egress mode, ingress pattern, and governance plane, then consult the authoritativereferences/*.mdmanual for exact CLI commands, REST/YAML schemas, Common Expression Language (CEL) expressions, and Python Agent Development Kit (ADK) runtime code (references/*.mdis the single source of truth for all implementation syntax). When remote Model Context Protocol (MCP) tools (such as the Google Developer Knowledge MCP server or Google-managed MCP endpoints) are available, prefer remote MCP tool invocation over raw CLI/REST commands. Do not execute unrequested live mutations against customer projects when asked for architectural designs.
[!CAUTION] Human Approval Gate for Sensitive Operations: Always prompt the user for explicit confirmation before executing commands or applying configurations that grant permissive Identity and Access Management (IAM) bindings (
roles/iap.egressor,roles/compute.networkUser,roles/networkservices.admin), modify Organization Policies (constraints/iam.managed.disableAccessPolicyBinding), update Unified Access Policy (UAP) or VPC Service Controls (VPC-SC) policies, or delete resources (RESTDELETE ...?force=trueor CLI--quiet).
Prerequisites, Authentication, Region, and Billing Setup
Google Cloud SDK, Authentication, and Project Setup:
Install the Google Cloud SDK (
gcloud) and authenticate CLI and Application Default Credentials (gcloud auth login && gcloud auth application-default login, or setGOOGLE_APPLICATION_CREDENTIALS).Select or create the target project (
gcloud projects create {project_id}/gcloud config set project {project_id}), set the default region (gcloud config set compute/region {region}, defaulting tous-central1; see Google Cloud Locations), and enable required APIs:gcloud services enable aiplatform.googleapis.com agentregistry.googleapis.com \ agentidentity.googleapis.com agentidentitycredentials.googleapis.com \ networkservices.googleapis.com networksecurity.googleapis.com iap.googleapis.com \ modelarmor.googleapis.com compute.googleapis.com dns.googleapis.com \ certificatemanager.googleapis.com servicenetworking.googleapis.com
Billing, Least-Privilege IAM, and Product Terminology:
Verify an active billing account is attached (
gcloud billing projects describe {project_id} --format="value(billingEnabled)") across{host_project_id},{gov_project_id},{runtime_project_id}, and{mcp_project_id}(required even when evaluating free-tier allowances; review Google Cloud Pricing).Grant explicit least-privilege IAM roles (
roles/aiplatform.user,roles/networkservices.admin,roles/compute.networkAdmin,roles/compute.networkUser,roles/iap.egressor, or a custom role withnetworkservices.agentGateways.get,networkservices.agentGateways.use,networkservices.operations.get) rather than primitiveroles/ownerorroles/editor.Use approved product names: Gemini platform, Agent Runtime (
reasoningEngines), Agent Gateway (240.0.0.2:443), Agent Connectivity Template (ACT), Agent Registry, and Unified Access Policy (UAP Policy V2) / Semantic Governance Policy (SGP).
3-Phase Architect Workflow and Decision Tree
graph TD
Start["Enterprise Gemini platform Architecture"] --> Q1{"1. Egress Destinations?"}
Q1 -->|"RFC 1918 + Google APIs Only"| Priv["ACT: vpcEgress = PRIVATE_RANGES_ONLY<br/>• Direct Private Google Access (PGA)"]
Q1 -->|"Public Internet, VPC-SC, or Non-RFC 1918 PUPI"| All["ACT: vpcEgress = ALL_TRAFFIC<br/>• 100% Egress via AGW VIP 240.0.0.2:443<br/>• Consolidate Core Google APIs FQDNs"]
All --> Q2{"2. Layer 7 URL List or Cross-Cloud mTLS?"}
Q2 -->|"No (Standard NAT)"| Nat["Direct Cloud NAT on PSC-I Subnet<br/>• ENDPOINT_TYPE_VM,ENDPOINT_TYPE_SWG"]
Q2 -->|"Yes (Next-Hop SWP)"| Swp["Next-Hop SWP (NEXT_HOP_ROUTING_MODE) + PBR<br/>• Internal and Google API DEFAULT_ROUTING bypasses<br/>• Default route via SWP ILB IP<br/>• Exclude PSC-I from manual Cloud NAT"]Phase 1 — Scope Verification and Architecture Discovery:
Scope Boundaries and Single-Region Discovery: Decline generic Google Cloud IAM/Compute/Storage debugging unrelated to the Gemini platform stack or requests to run broad multi-region live project scanning loops, pointing instead to
gcloud ai reasoning-engines list --region={region}.Architecture Design and Engineering: Identify the project hierarchy (
Host,Governance Hub,Runtime Spoke,Tool/MCP Spoke), egress mode (ALL_TRAFFICvsPRIVATE_RANGES_ONLY), policy plane (UAP V2, SGP, Model Armor), and target output format (topology specification,gcloudCLI commands, or REST/YAML manifests).
Phase 2 — Draft Architecture Plan and Resource Mapping:
Synthesize the topology diagram, project/VPC layout, IAM bootstrap matrix, and security controls using the Domain Router and Symptom Matrix, and map each manual's canonical REST/YAML schema and CLI commands into the target deployment artifacts.
Phase 3 — Post-Deployment and Audit Log Verification:
Pair every architecture design with the Post-Deployment and Cloud Audit Log Verification checklist (
references/topologies_and_project_layouts.md) and runtime query validation (references/agent_runtime_and_identity.md).
Domain Router and Symptom Matrix
Each reference manual in references/ is the single source of truth for its
domain's CLI commands, REST/YAML schemas, quotas, and CEL expressions. Always
read the corresponding reference manual before generating configurations or
answering domain-specific questions:
| Architecture Domain | Topics and Architectural Decisions Covered | Symptoms and Failure Modes Routed Here | Canonical Reference Manual |
|---|---|---|---|
| 1. Project Hierarchy, Shared VPC, VPC-SC, and Custom Routing | Multi-project separation (Host, Governance Hub, Runtime Spoke, Tool/MCP Spoke), PSC-I subnet sizing, cross-project Service Agent IAM bootstrap, VPC-SC perimeters, non-RFC 1918 PUPI/peered custom route exchange, and post-deployment Cloud Audit Log verification. | PSC-I IP exhaustion, cross-project attachment or addressGroup permission denials, VPC-SC perimeter blocks, dropped non-RFC 1918 internal routes, or post-deployment verification. | references/topologies_and_project_layouts.md |
| 2. Agent Connectivity Template (ACT) and Agent Gateway | Choosing ALL_TRAFFIC vs PRIVATE_RANGES_ONLY, ACT and Agent Gateway REST/YAML schemas, control-plane URI formatting, registry attachment limits, and container custom Root CA bundle trust. | Control-plane URI validation errors, registry attachment limit errors, or container TLS verification failures ([SSL: UNEXPECTED_EOF_WHILE_READING]). | references/agent_gateway_and_act.md |
| 3. Outbound Routing, Next-Hop SWP, PBR, and Hybrid mTLS | Source-range Policy-Based Routes (PBR) for PSC-I subnets, Next-Hop Secure Web Proxy (NEXT_HOP_ROUTING_MODE), swg-autogen-nat vs manual Cloud NAT coexistence, gRPC/A2A/WebSocket routing, Spanner SA impersonation, and Cross-Cloud mTLS Egress Hubs (Hybrid NEG). | Asymmetric return-routing drops between manual Cloud NAT and swg-autogen-nat, outbound URL filtering on PSC-I interfaces, or cross-cloud mTLS origination over Cloud Interconnect/VPN. | references/egress_routing_and_swp.md |
| 4. Ingress ALB, URL Rewrites, Private CA, and 3P IdP STS | Two-Tier and Single-Tier ALB ingress with URL Map hostRewrite/pathPrefixRewrite, Private CA TrustConfig with Regional Internal ALB + Serverless NEG for Cloud Run MCP servers, and 3P IdP (EntraID/Ping/Okta) token exchange via LbTrafficExtension (ext_proc + STS). | WebPKI root stripping (NO_ADDITIONAL_ROOTS), empty :authority drops on Serverless NEGs, *.run.app Google-managed certificate mismatches, or OAuth/IAP header collisions. | references/ingress_patterns_and_rewrites.md |
| 5. UAP Policy V2, IAP V1, SGP, and Model Armor Governance | Organization/Folder/Project UAP Policy V2 and IAP V1 CEL authorization rules, Semantic Governance Policy (SGP CONTENT_AUTHZ), custom AuthzExtension / AuthzPolicy targets, and fail-closed Model Armor Floor Settings, templates, and ADK callbacks. | Egress request is not authorized (HTTP 403 / status.code=7) on MCP initialize or tools/list, failed to parse the service URL on AuthzExtension, binary gRPC parser crashes, or fail-open safety bypasses. | references/governance_security_policies.md |
6. Agent Registry, Consolidated googleapis, and Federation | Consolidating core Google APIs FQDNs into a single googleapis service (ALL_TRAFFIC), registering MCP/A2A/REST services, extracting server-generated registryResource UUIDs for roles/iap.egressor, and Event-Driven Spoke-to-Hub Registry Federation. | ALL_TRAFFIC agent startup or telemetry blackholing, IAM binding target mismatches on Registry resources, OpenAPI/MCP spec size rejections, or multi-project catalog drift. | references/registry_and_federation.md |
| 7. ADK Runtime Packaging, Agent Identity, and Day-2 Operations | Packaging ADK agents with AGENT_IDENTITY (SPIFFE) and Auth Manager, regional residency, BigQuery pre-execution cost guards, in-place ACT updates, reverse-dependency teardown, and external Cloud NAT IP verification. | Raw credential exposure, HTTP 409 ABORTED control-plane mutex locks, HTTP 400 FAILED_PRECONDITION (FROM_AGENT_GATEWAY* or contains child resources: sessions), or X-Forwarded-For: 0.0.0.0 when probing *.run.app. | references/agent_runtime_and_identity.md |
Supporting Public Documentation Links
Files
- ATTRIBUTION.mdAdded by AutoGineer852 B
- LICENSELicence file added by AutoGineer11.1 KiB
- SKILL.md14.4 KiB
- references/agent_gateway_and_act.md14.7 KiB
- references/agent_runtime_and_identity.md27.8 KiB
- references/attribution.md1.9 KiB
- references/egress_routing_and_swp.md22.2 KiB
- references/governance_security_policies.md30.2 KiB
- references/ingress_patterns_and_rewrites.md25.5 KiB
- references/registry_and_federation.md19.6 KiB
- references/topologies_and_project_layouts.md31.6 KiB
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Requirements and compatibility
Works with: Claude Code, Claude apps, OpenAI Codex, GitHub Copilot, Cursor, Gemini CLI, Kiro, OpenCode, Goose, Amp, Roo Code, JetBrains Junie, Factory Droid, Devin (ex-Windsurf), Mistral Vibe, OpenHands, Letta
“Works with” means the tool reads the open Agent Skills format; a skill written for one tool may use features others lack.
Needs: Needs an MCP server, Needs a command-line tool
Security
What our scanner noticed· Low risk
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Attribution and licence
- Published by
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- Source
- google/skills · skills/cloud/agent-platform-architecture · commit 2194d3b
- Licence
- Apache License 2.0 (redistribution allowed)
- LICENSE (added by AutoGineer from LICENSE)
- ATTRIBUTION.md (written by AutoGineer)
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