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+# AGENTS.md
+
+## 0. Agent scope & identity
+
+You are an AI coding agent working inside this repository only.
+
+Your primary goals:
+- Implement features and fixes as requested.
+- Preserve existing architecture and public contracts.
+- Maintain reliability, security, and performance.
+
+You must:
+- Prefer small, reviewable changes.
+- Explain non-trivial decisions in comments or commit messages.
+- Ask for clarification when a change would break explicit constraints below.
+
+## 1. Project overview
+
+**Purpose of this repo:**
+- Public-facing GitHub repository for Kiro, an agentic IDE built by AWS
+- Contains public documentation (README, contributing guidelines, user docs)
+- Houses TypeScript automation scripts for GitHub issue management using AWS Bedrock AI
+
+**Core domains / bounded contexts:**
+- Issue Triage: Automatic classification and labeling of new issues using Claude Sonnet 4.5
+- Duplicate Detection: Semantic similarity analysis to find duplicate issues
+- Stale Issue Management: Auto-closing issues pending user response after 7 days
+- Duplicate Closure: Auto-closing confirmed duplicates after 3 days
+
+**Critical invariants:**
+- All new issues must receive the `pending-triage` label by default
+- Duplicate detection threshold must remain at 0.80 similarity score
+- Input sanitization must be applied to all user-provided content before AI processing
+- Prompt injection patterns must be detected and redacted
+- Label assignments must be validated against the defined taxonomy
+
+## 2. Environment & assumptions
+
+**Runtime:**
+- Node.js: 20.x (as specified in GitHub Actions workflows)
+- TypeScript: ^5.3.3 (ES2022 target, strict mode)
+
+**Package manager:**
+- npm (stay consistent, do not switch to yarn or pnpm)
+
+**Local services:**
+- None required for local development
+- AWS Bedrock access required for AI classification (Claude Sonnet 4.5)
+- GitHub API access required for issue management
+
+**Network access:**
+- Scripts require internet access to communicate with AWS Bedrock and GitHub APIs
+- Do not assume internet access for other purposes
+
+## 3. Setup & commands
+
+Always use these commands when working with the project. All commands run from the `scripts/` directory:
+
+**Install dependencies:**
+```bash
+cd scripts && npm install
+```
+
+**Build TypeScript:**
+```bash
+cd scripts && npm run build
+```
+
+**Run unit tests:**
+```bash
+cd scripts && npm test
+```
+
+**Run local integration test:**
+```bash
+cd scripts && npm run test:local
+```
+
+**Clean build artifacts:**
+```bash
+cd scripts && npm run clean
+```
+
+**Rule:** Before you propose final changes, run `npm run build` and `npm test` from the `scripts/` directory to ensure compilation succeeds and tests pass.
+
+## 4. Repository & architecture map
+
+**High-level structure:**
+```
+/                           — Repository root (docs, README, contributing guidelines)
+├── .github/workflows/      — GitHub Actions for issue automation
+├── scripts/                — TypeScript automation code (core logic)
+│   ├── data_models.ts      — Interfaces and classes (LabelTaxonomy, etc.)
+│   ├── bedrock_classifier.ts — AWS Bedrock AI integration
+│   ├── assign_labels.ts    — GitHub label assignment logic
+│   ├── detect_duplicates.ts — Semantic duplicate detection
+│   ├── retry_utils.ts      — Exponential backoff retry logic
+│   ├── rate_limit_utils.ts — GitHub API rate limiting
+│   ├── workflow_summary.ts — GitHub Actions summary generation
+│   ├── triage_issue.ts     — Main triage orchestration script
+│   ├── close_duplicates.ts — Duplicate issue closer script
+│   ├── close_stale.ts      — Stale issue closer script
+│   └── test/               — Test files
+├── docs/                   — User-facing documentation
+├── assets/                 — Images and branding
+└── .kiro/                  — Kiro IDE configuration (specs, steering)
+```
+
+**Key entrypoints:**
+- Main triage script: `scripts/triage_issue.ts`
+- Duplicate closer: `scripts/close_duplicates.ts`
+- Stale issue closer: `scripts/close_stale.ts`
+- GitHub Actions: `.github/workflows/issue-triage.yml`, `.github/workflows/close-stale.yml`, `.github/workflows/close-duplicates.yml`
+
+## 5. Coding conventions
+
+**Language:**
+- TypeScript strict mode: true (do not weaken typings)
+- ES2022 target with ES modules (`"type": "module"` in package.json)
+
+**Style:**
+- Quotes: double quotes for strings
+- Semicolons: required
+- Import order: Node.js built-ins, external packages, local modules
+- All imports must use `.js` extension for ES module compatibility (e.g., `import { LabelTaxonomy } from "./data_models.js"`)
+- Prefer pure functions where possible; side effects in main scripts and handlers
+- Use named exports for functions and classes
+
+**Error handling:**
+- Use try/catch blocks with detailed error logging
+- Implement retry logic with exponential backoff for external API calls (use `retryWithBackoff` from `retry_utils.ts`)
+- Return boolean success indicators rather than throwing for non-critical failures
+- Log errors with context (issue number, step name, etc.)
+
+**Logging:**
+- Use `console.log` for informational messages
+- Use `console.error` for error messages
+- Use `console.warn` for warnings
+- Do not log secrets, tokens, or PII
+
+## 6. Testing strategy
+
+When you change code:
+- Always add or update tests covering:
+  - Happy path scenarios
+  - Relevant edge cases
+  - Regressions you are fixing
+
+**Test locations:**
+- Unit tests: `scripts/test/*.test.ts`
+- Integration tests: `scripts/test/test-*.ts` (non-.test.ts files)
+
+**Test patterns:**
+- Test files use `.test.ts` suffix for Jest discovery
+- Use `describe` and `it` blocks for test organization
+- Use `beforeEach` for test setup
+
+**Commands:**
+- Unit tests: `cd scripts && npm test`
+- Local integration: `cd scripts && npm run test:local`
+
+If tests fail, fix them or revert the change. Do not silence or delete failing tests without explicit justification.
+
+## 7. Workflow rules
+
+**Branching:**
+- Use branches like `feature/...`, `fix/...`, `chore/...`
+
+**Commits:**
+- Keep commits small and focused
+- Use conventional commit format:
+  - `feat: add new label category`
+  - `fix: correct duplicate detection threshold`
+  - `chore: update dependencies`
+  - `docs: improve README`
+
+**Pull requests:**
+- Title format: `[scope] short description` (e.g., `[scripts] fix retry logic`)
+- PR must include:
+  - Summary of changes
+  - Risks and mitigations
+  - How to test (commands + steps)
+
+## 8. Safety, secrets & destructive operations
+
+**Never hardcode secrets, tokens, or passwords.**
+
+**Do not read or modify:**
+- `.env*` files or `scripts/.env.example` (except to document new required variables)
+- GitHub Secrets configuration
+- AWS credentials in any form
+
+**Required environment variables (set externally, never committed):**
+- `GITHUB_TOKEN` — GitHub API access
+- `AWS_ACCESS_KEY_ID` — AWS Bedrock access
+- `AWS_SECRET_ACCESS_KEY` — AWS Bedrock access
+- `AWS_REGION` — AWS region (defaults to us-east-1)
+
+**Destructive operations are forbidden unless explicitly requested:**
+- Closing issues programmatically (only via the designated scripts)
+- Removing labels from issues
+- Modifying GitHub repository settings
+- Altering AWS IAM policies or Bedrock configurations
+
+**Security requirements:**
+- All user input (issue titles, bodies) must be sanitized before AI processing
+- Prompt injection patterns must be detected and redacted
+- Input length limits must be enforced (title: 500 chars, body: 10,000 chars)
+
+If you are unsure whether a change might be destructive, ask before proceeding.
+
+## 9. Tooling & integrations
+
+**AWS Bedrock:**
+- Model: Claude Sonnet 4.5 (`us.anthropic.claude-sonnet-4-20250514-v1:0`)
+- Used for issue classification and duplicate detection
+- Always use `retryWithBackoff` for API calls
+
+**GitHub API (Octokit):**
+- Used for issue management (labels, comments, closing)
+- Always use `retryWithBackoff` for API calls
+- Respect rate limits using utilities in `rate_limit_utils.ts`
+
+**GitHub Actions:**
+- Workflows trigger on issue events and schedules
+- Node.js 20 runtime
+- Secrets provided via GitHub Secrets
+
+Do not introduce new external services or tools without clear justification and minimal footprint.
+
+## 10. Constraints / do-not-touch areas
+
+**Do not change, unless a task explicitly requires it:**
+
+**Label taxonomy (in `data_models.ts`):**
+- The `LabelTaxonomy` class defines all valid labels
+- Adding/removing labels affects classification and validation
+- Changes require coordination with GitHub repository label configuration
+
+**AI model configuration:**
+- Model ID: `us.anthropic.claude-sonnet-4-20250514-v1:0`
+- Temperature: 0.3
+- Max tokens: 2048
+- Similarity threshold: 0.8
+
+**Threshold values:**
+- Duplicate closure: 3 days
+- Stale issue closure: 7 days
+- Duplicate similarity: 0.80
+
+**Security patterns:**
+- Input sanitization functions in `bedrock_classifier.ts` and `detect_duplicates.ts`
+- Prompt injection detection patterns
+- Input length limits
+
+**Generated or vendor files — do not manually edit:**
+- `scripts/dist/` (compiled output)
+- `scripts/package-lock.json` (unless updating dependencies via npm)
+- `scripts/node_modules/`
+
+## 11. Performance & resource guidelines
+
+**Performance-critical paths:**
+- Bedrock API calls (10-15 seconds per issue classification)
+- Duplicate detection batch processing (5-10 seconds per batch of 10)
+- GitHub API rate limits (respect limits, use batching)
+
+**Optimization strategies already in place:**
+- Batch processing for duplicate detection (BATCH_SIZE = 10)
+- Retry logic with exponential backoff (max 3 retries, 1-8 second delays)
+- Rate limit monitoring for GitHub API
+
+**Guidelines:**
+- Avoid algorithms worse than O(n log n) for processing issue lists
+- Be mindful of additional Bedrock API calls (each costs time and money)
+- When modifying duplicate detection, consider the 90-day search window and batch size
+
+If a task touches Bedrock integration or batch processing, summarize your reasoning and trade-offs.
+
+## 12. Monorepo & nested AGENTS.md
+
+This repository is not a monorepo. There are no nested AGENTS.md files currently in use.
+
+**Rule:** If nested AGENTS.md files are added in the future, follow the instructions of the closest AGENTS.md to the file you are editing.
+
+**Global constraints that always apply regardless of location:**
+- Security requirements (input sanitization, no hardcoded secrets)
+- Secrets handling (environment variables only)
+- Destructive operation restrictions
+
+## 13. Multi-agent / personas
+
+If you are a specialized agent, follow your persona rules in addition to this file:
+
+**@dev-agent:**
+- Focus on implementation and tests
+- Ensure all changes compile and pass tests
+
+**@test-agent:**
+- Focus on test coverage and edge cases
+- Do not change runtime code unless fixing test flakiness
+
+**@security-agent:**
+- Focus on security review and hardening
+- Verify input sanitization and prompt injection protection
+- Minimize functional changes
+
+**Priority ordering:** security > correctness > convenience
+
+## 14. Definition of Done (checklist)
+
+Before considering a task complete, ensure:
+
+- [ ] Code compiles: `cd scripts && npm run build` succeeds
+- [ ] Tests pass: `cd scripts && npm test` succeeds
+- [ ] No constraints from section 10 are violated
+- [ ] New/changed behavior is covered by tests
+- [ ] Input sanitization is applied to any new user input handling
+- [ ] Retry logic is used for any new external API calls
+- [ ] Changes are documented (PR description, code comments)
+- [ ] No secrets or sensitive data added to the repo
+- [ ] Import statements use `.js` extension for ES module compatibility
+
+If any item is not satisfied, the task is not done.