push-to-registry

Q: How do I install push-to-registry?

Run npx skills add https://github.com/hashicorp/agent-skills --skill push-to-registry in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/push-to-registry/ (personal) or .claude/skills/push-to-registry/ (project).

Q: Which AI agents can use push-to-registry?

Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.

Q: Is push-to-registry safe to install?

No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.

Q: Who maintains push-to-registry?

It is published by hashicorp in hashicorp/agent-skills, and it is an official skill from the maker of the technology it covers. It has 3,000 recorded installs.

by hashicorp OfficialAI & Agents

Push Packer build metadata to HCP Packer registry for tracking and managing image lifecycle. Use when integrating Packer builds with HCP Packer for version control and governance.

Installs: 3K
Last 24h: +16
Trending rank: #6757
Security: Not audited

Install

Works with every agent the skills CLI supports.

npx skills add https://github.com/hashicorp/agent-skills --skill push-to-registry

01
Install
Run the command in your project. The CLI asks which agents to install for.
02
Describe the task
Ask your agent for something this skill covers. It loads push-to-registry automatically when relevant.
03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.

SKILL.md

The instructions your agent reads when the skill is triggered.

Push to HCP Packer Registry

Configure Packer templates to push build metadata to HCP Packer registry.

Reference: HCP Packer Registry

Note: HCP Packer is free for basic use. Builds push metadata only (not actual images), adding minimal overhead (<1 minute).

Basic Registry Configuration

packer {
  required_version = ">= 1.7.7"
}

variable "image_name" {
  type    = string
  default = "web-server"
}

locals {
  timestamp = regex_replace(timestamp(), "[- TZ:]", "")
}

source "amazon-ebs" "ubuntu" {
  region        = "us-west-2"
  instance_type = "t3.micro"

  source_ami_filter {
    filters = {
      name = "ubuntu/images/*ubuntu-jammy-22.04-amd64-server-*"
    }
    most_recent = true
    owners      = ["099720109477"]
  }

  ssh_username = "ubuntu"
  ami_name     = "${var.image_name}-${local.timestamp}"
}

build {
  sources = ["source.amazon-ebs.ubuntu"]

  hcp_packer_registry {
    bucket_name = var.image_name
    description = "Ubuntu 22.04 base image for web servers"

    bucket_labels = {
      "os"   = "ubuntu"
      "team" = "platform"
    }

    build_labels = {
      "build-time" = local.timestamp
    }
  }

  provisioner "shell" {
    inline = [
      "sudo apt-get update",
      "sudo apt-get upgrade -y",
    ]
  }
}

Authentication

Set environment variables before building:

export HCP_CLIENT_ID="your-service-principal-client-id"
export HCP_CLIENT_SECRET="your-service-principal-secret"
export HCP_ORGANIZATION_ID="your-org-id"
export HCP_PROJECT_ID="your-project-id"

packer build .

Create HCP Service Principal

Navigate to HCP → Access Control (IAM)
Create Service Principal
Grant "Contributor" role on project
Generate client secret
Save client ID and secret

Registry Configuration Options

bucket_name (required)

The image identifier. Must stay consistent across builds!

bucket_name = "web-server"  # Keep this constant

bucket_labels (optional)

Metadata at bucket level. Updates with each build.

bucket_labels = {
  "os"        = "ubuntu"
  "team"      = "platform"
  "component" = "web"
}

build_labels (optional)

Metadata for each iteration. Immutable after build completes.

build_labels = {
  "build-time" = local.timestamp
  "git-commit" = var.git_commit
}

CI/CD Integration

GitHub Actions

name: Build and Push to HCP Packer

on:
  push:
    branches: [main]

env:
  HCP_CLIENT_ID: ${{ secrets.HCP_CLIENT_ID }}
  HCP_CLIENT_SECRET: ${{ secrets.HCP_CLIENT_SECRET }}
  HCP_ORGANIZATION_ID: ${{ secrets.HCP_ORGANIZATION_ID }}
  HCP_PROJECT_ID: ${{ secrets.HCP_PROJECT_ID }}

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: hashicorp/setup-packer@main

      - name: Build and push
        run: |
          packer init .
          packer build \
            -var "git_commit=${{ github.sha }}" \
            .

Querying in Terraform

data "hcp_packer_artifact" "ubuntu" {
  bucket_name  = "web-server"
  channel_name = "production"
  platform     = "aws"
  region       = "us-west-2"
}

resource "aws_instance" "web" {
  ami           = data.hcp_packer_artifact.ubuntu.external_identifier
  instance_type = "t3.micro"

  tags = {
    PackerBucket = data.hcp_packer_artifact.ubuntu.bucket_name
  }
}

Common Issues

Authentication Failed

Verify HCP_CLIENT_ID and HCP_CLIENT_SECRET
Ensure service principal has Contributor role
Check organization and project IDs

Bucket Name Mismatch

Keep bucket_name consistent across builds
Don't include timestamps in bucket_name
Creates new bucket if name changes

Build Fails

Packer fails immediately if can't push metadata
Prevents drift between artifacts and registry
Check network connectivity to HCP API

Best Practices

Consistent bucket names - Never change for same image type
Meaningful labels - Use for versions, teams, compliance
CI/CD automation - Automate builds and registry pushes
Immutable build labels - Put changing data (git SHA, date) in build_labels

References

FAQ

What does the push-to-registry skill do?

Push Packer build metadata to HCP Packer registry for tracking and managing image lifecycle. Use when integrating Packer builds with HCP Packer for version control and governance.

How do I install push-to-registry?

Run npx skills add https://github.com/hashicorp/agent-skills --skill push-to-registry in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/push-to-registry/ (personal) or .claude/skills/push-to-registry/ (project).

Which AI agents can use push-to-registry?

Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.

Is push-to-registry safe to install?

No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.

Who maintains push-to-registry?

It is published by hashicorp in hashicorp/agent-skills, and it is an official skill from the maker of the technology it covers. It has 3,000 recorded installs.

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push-to-registry

Install

Install

Describe the task

Review the result

SKILL.md

Push to HCP Packer Registry

Basic Registry Configuration

Authentication

Create HCP Service Principal

Registry Configuration Options

bucket_name (required)

bucket_labels (optional)

build_labels (optional)

CI/CD Integration

GitHub Actions

Querying in Terraform

Common Issues

Best Practices

References

FAQ

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