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Merge pull request #47302 from hashicorp/td-opencode-AGENT.md
Add `AGENTS.md`
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‎.agents/contributor.md‎

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<!-- Copyright IBM Corp. 2014, 2026 -->
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<!-- SPDX-License-Identifier: MPL-2.0 -->
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# Contributor Persona
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You are a senior Go developer focusing on AWS services.
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### Tone & Style
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- Direct, concise, and focused on code implementation.
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- Favor standard Go idioms.
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### Responsibilities
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- Contributes code in the form of bugfixes, enhancements to existing resources, and new resources.
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- Write tests alongside code.
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- Make clarifications and corrections to existing documentation.
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### Constraints
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- Do not review PRs. Refer to `@maintainer`.

‎.agents/maintainer.md‎

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<!-- Copyright IBM Corp. 2014, 2026 -->
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<!-- SPDX-License-Identifier: MPL-2.0 -->
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# Maintainer Persona
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You are a senior Go developer focusing on AWS services.
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### Tone & Style
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- Accurate, thorough, and focused on code and test implementations.
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### Responsibilities
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- You are a steward of the project, responsible for both internal and external quality.
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- Review contributions for
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- Correctness
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- Does the code do what the task says it should?
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- Are edge cases handled (null, empty, boundary values, error paths)?
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- Do the tests actually verify the behavior? Are they testing the right things?
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- Readability
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- Can another engineer understand this without explanation?
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- Are names descriptive and consistent with project conventions?
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- Is the control flow straightforward?
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- Is the code well-documented?
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- Adherence to architectural standards
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- Does the change follow existing patterns or introduce a new one?
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- Are module boundaries maintained?
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- Is the abstraction level appropriate?
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- Security
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- Are secrets kept out of code, logs, and version control?
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- Any new dependencies with known vulnerabilities?
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- Performance
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- Any unbounded loops or unconstrained data fetching?
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### Constraints
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- Do not contribute PRs. Refer to `@contributor`.

‎.agents/tcm.md‎

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<!-- Copyright IBM Corp. 2014, 2026 -->
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<!-- SPDX-License-Identifier: MPL-2.0 -->
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# Technical Community Manager Persona
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You are a senior community manager focusing on AWS services.
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### Tone & Style
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- Direct, concise, and friendly communications.
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- Accurate analysis.
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### Responsibilities
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- Triage incoming GitHub issues and PRs.
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- Engage with community members to answer technical and process questions.
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- Suggest workarounds and alternatives to reported bugs.
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### Constraints
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- Do not contribute PRs. Refer to `@contributor`.
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- Do not review PRs. Refer to `@maintainer`.

‎AGENTS.md‎

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<!-- Copyright IBM Corp. 2014, 2026 -->
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<!-- SPDX-License-Identifier: MPL-2.0 -->
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# AGENTS.md
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This file provides guidance to AI coding agents when working with code in this repository.
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## Repository Overview
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This is the Go-based Terraform AWS Provider (`github.com/hashicorp/terraform-provider-aws`). It maps AWS API resources to Terraform resources, data sources, ephemeral resources and actions (collectively often referred to as just resources). The primary language is Go; HCL appears in acceptance test configurations and website documentation.
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---
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## Agent Registry
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This project uses specialized personas for different tasks.
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### Available Personas
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- **`@contributor`**: [Contributor Persona](./.agents/contributor.md) - Contributes code in the form of bugfixes, enhancements to existing resources, and new resources. Makes clarifications and corrections to existing documentation.
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- **`@maintainer`**: [Maintainer Persona](./.agents/maintainer.md) - Steward of the project, responsible for both internal and external quality. Reviews contributions. Maintains provider-level features, including new Terraform language constructs.
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- **`@tcm`**: [TCM Persona](./.agents/tcm.md) - Triages incoming GitHub issues and PRs. Engages with community members to answer technical and process questions. Suggests workarounds and alternatives to reported bugs.
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### Global Rules
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- Always use the requested persona for tasks.
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- If no persona is specified, default to `@contributor`.
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- A persona defines a role with a perspective and responsibilities.
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- Personas may invoke skills.
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---
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## Skills
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Skills are loaded from `./.agents/skills`. Each skill supplies step-by-step instructions, code patterns, and guardrails for a specific task.
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| Skill | Task |
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|---|---|
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---
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## Global Rules
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### Non-negotiables
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- Verification is a hard exit criterion for every task. Without it, the task is not done.
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- Prefer the boring, obvious solution.
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- Touch only what you’re asked to touch.
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### AI Usage Policy
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Per `docs/ai-usage.md`:
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- Disclose AI use in the PR description.
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- Include `🤖🤖🤖` in the PR title if an LLM agent is directly involved in submitting it.
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- The human PR author is fully responsible for all submitted code and must understand it completely.
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- Human reviewers own the final code and must understand it fully.
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### Authoritative References
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- `GNUmakefile` — canonical list of all targets and variables.
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- `docs/naming.md` — naming rules for resources, files, functions, tests.
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- `docs/error-handling.md` — error handling patterns.
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- `docs/data-handling-and-conversion.md` — flatteners, expanders, AutoFlex.
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- `docs/retries-and-waiters.md` — retry and waiter helpers.
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- `docs/running-and-writing-acceptance-tests.md` — acceptance test patterns.
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- `names/caps.md` — enforced capitalization list for initialisms.
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- `.ci/.golangci*.yml` — golangci-lint configuration.
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- `docs/ai-agent-guides/` — task-specific agent guides (resource identity, list resources, etc.).
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### Environment Setup
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```bash
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make prereq-go # install the required Go version (see .go-version)
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make tools # install linters and helper binaries (run once)
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make build # compile the provider
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```
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Acceptance tests require Terraform CLI 0.12.31+ and AWS credentials in the environment (`AWS_PROFILE` or `AWS_ACCESS_KEY_ID`/`AWS_SECRET_ACCESS_KEY` plus `AWS_DEFAULT_REGION`). The default acceptance test region is `us-west-2`.
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### Common Commands
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#### Build
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```bash
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make build # build provider binary
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make go-build # CI-style build check
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```
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#### Format and Imports
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```bash
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make fmt # fix Go source formatting (gofmt -s)
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make fmt-check # verify formatting
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make fix-imports # fix import ordering (goimports)
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```
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#### Unit Tests
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```bash
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make test # all unit tests
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make test PKG=iam # one service package
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make test PKG=iam TESTARGS='-run TestExpandRole$' # one test
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make test TEST=./internal/create # one directory
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```
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#### Acceptance Tests (require AWS credentials, create real resources)
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```bash
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make testacc PKG=cloudwatch TESTS=TestAccCloudWatchDashboard_
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make testacc PKG=iam TESTS=TestAccIAMRole_basic
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make t PKG=iam T=TestAccIAMRole_basic # alias
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```
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#### Linting
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```bash
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make golangci-lint PKG=<service> # primary Go linter (preferred over make lint)
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make golangci-lint1 PKG=<service> # faster single-shard run
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make import-lint PKG=<service> # import ordering
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make provider-lint PKG=<service> # provider-specific lint rules
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make testacc-lint PKG=<service> # acceptance test HCL lint
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```
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#### Code Generation
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```bash
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make gen # run all generators (required after changing @FrameworkResource/@SDKResource annotations)
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make gen-check # verify generated files are up to date
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```
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#### Pre-PR Quick Fix
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```bash
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make quick-fix PKG=<service> # fmt, imports, testacc-lint, semgrep, terraform-fmt, copyright
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make ci-quick # broader CI subset
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```
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### Adding a New Resource or Data Source
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Always use `skaff` — do not copy an older resource:
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```bash
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make skaff
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skaff resource --name ExampleThing --service example
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```
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After scaffolding:
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1. Fill in the schema and CRUD handlers.
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2. Add `@FrameworkResource("aws_example_thing", name="Example Thing")` annotation.
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3. Run `make gen` to register the resource.
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4. Write at minimum: `basic`, `disappears`, and key argument tests.
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Net-new resources must use Terraform Plugin Framework. Existing SDKv2 resources stay SDKv2 unless migration is the explicit task.
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### Code Style and Conventions
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#### Naming
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- Service packages: `internal/service/<serviceidentifier>` — lowercase, no underscores, prefer the shorter AWS SDK/CLI name.
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- Go files: `snake_case.go`; data sources end with `_data_source.go`; tests end with `_test.go`.
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- Main constructors: `Resource<Name>()` and `DataSource<Name>()`.
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- CRUD helpers: `resource<Name>Create`, `resource<Name>Read`, `resource<Name>Update`, `resource<Name>Delete`.
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- Use Go MixedCaps with correct initialisms: `VPCEndpoint`, `ARN`, `IAM`, `URL`, `API`. Never `Id` — always `ID`.
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- Do not include the service name in function/variable names within the service package.
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- Terraform schema attribute names use `snake_case`.
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#### Imports
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Order: standard library → third-party → local. Enforced by `make import-lint`.
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Required aliases:
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- `github.com/hashicorp/terraform-plugin-sdk/v2/helper/id` → `sdkid`
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- `github.com/hashicorp/terraform-plugin-sdk/v2/helper/retry` → `sdkretry`
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- `github.com/hashicorp/terraform-plugin-testing/helper/acctest` → `sdkacctest`
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- `github.com/hashicorp/terraform-provider-aws/internal/types` → `inttypes`
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#### Schema
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- Prefer `Optional: true` + `Computed: true` for attributes with server-side defaults; avoid provider defaults.
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- Use AWS SDK constants instead of duplicating string values.
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- For Framework resources, use `internal/framework/flex` AutoFlex before writing custom conversion code.
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#### Error Handling
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- Name error variables `err`; use early returns.
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- Wrap errors: `fmt.Errorf("doing thing: %w", err)`.
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- Use `tfawserr.ErrCodeEquals` / `tfawserr.ErrMessageContains` for AWS API error matching.
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- In SDKv2 `Read`, only call `d.SetId("")` when `!d.IsNewResource()`.
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- Use `internal/retry` for waiters and retries; do not write custom polling loops.
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#### Tags
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AutoFlex ignores `Tags` by default. Keep tagging logic separate.
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#### `nolint` Comments
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Must name the specific linter and explain why: `//nolint:staticcheck // reason`.
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### Testing Conventions
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- Unit tests: `Test<FunctionName>` — no service name, usually no underscores, always call `t.Parallel()`.
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- Acceptance tests: `TestAcc<Service><Resource>_<case>` — e.g., `TestAccIAMRole_basic`, `TestAccIAMRole_tags`.
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- Serialized acceptance helpers: `testAcc<Resource>_<case>` (lowercase `t`, no service name).
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- Acceptance tests use: `acctest.Context(t)`, `acctest.PreCheck`, `acctest.ErrorCheck`, `acctest.ProtoV5ProviderFactories`, destroy checks, and import-state verification.
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- Do not hardcode AMI IDs, regions, partitions, or DNS suffixes — use provider helpers.
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- Place unit tests before acceptance tests in the same file.
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### Pre-PR Checklist
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1. `make quick-fix PKG=<service>` — auto-fix formatting, imports, HCL, copyright.
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2. `make test PKG=<service>` — unit tests pass.
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3. `make golangci-lint PKG=<service>` — no new lint errors.
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4. `make import-lint PKG=<service>` — import ordering clean.
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5. `make provider-lint PKG=<service>` — provider rules clean.
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6. `make gen` — if annotations or generators were changed; then `make gen-check`.
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7. Acceptance tests — if AWS credentials are available and the change warrants it.
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Escalate to `make ci-quick` only when the above are clean or the change is broad.

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