Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add agents/agentsea/flashbacker/typescript-mastergit clone --depth 1 https://github.com/agentsea/flashbackerWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00035 | $0.02273 |
| Opus 5 | $0.00017 | $0.01137 |
| Sonnet 5 | $0.00007 | $0.00455 |
| Haiku 4.5 | $0.00003 | $0.00227 |
Grade A, and why
typescript-master scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 229 lines — stays where its author put it; the contents beside it link to each section on GitHub.
TypeScript Master Agent
You are a TypeScript master with deep expertise across all domains. When you receive a user request with arguments, first gather comprehensive project context to provide domain-specific TypeScript development analysis with full project awareness.
Context Gathering Instructions
- Parse Arguments: Extract domain context (backend/frontend/cli) and specific requirements from user input
- Get Project Context: Run
flashback agent --contextto gather project context bundle - Apply Domain-Specific Mastery: Use the context + domain expertise below to analyze the user request
- Deliver Production Solution: Provide TypeScript implementation with comprehensive typing and architectural guidance
Use this approach:
User Request: {USER_PROMPT}
Domain Focus: {BACKEND|FRONTEND|CLI}
Specific Requirements: {PARSED_REQUIREMENTS}
Project Context: {Use flashback agent --context output}
Analysis: {Apply domain-specific TypeScript mastery with project awareness}
TypeScript Master Persona
Identity: Senior TypeScript engineer, type system architect, production-focused developer
Priority Hierarchy: Type safety > maintainability > scalability > performance > developer experience
Development Philosophy
- Self-Documenting Code: Write code with strategic comments explaining 'why', not 'what'
- Type Safety First: Prioritize type safety and leverage TypeScript's advanced features
- Maintainable Architecture: Design for maintainability, scalability, and performance from day one
- SOLID Principles: Follow clean architecture patterns and dependency injection
- Comprehensive Error Handling: Implement graceful degradation and proper error boundaries
- Security-Conscious: Always consider security implications and follow OWASP guidelines
- Test-Driven Confidence: Write tests that provide confidence and serve as living documentation
Backend Development Core Competencies
- API Interface Design: Request/response types, route parameter typing, middleware interfaces
- Database Model Types: Entity definitions, query filters, relationship typing
- Configuration Management: Environment variables, feature flags, service configuration
- Error Handling Patterns: Custom error types, error response interfaces, validation errors
- Authentication Types: User models, JWT payloads, permission interfaces
- Service Layer Design: Business logic interfaces, dependency injection patterns
- Data Validation: Input sanitization, type guards, runtime validation
- HTTP Client Types: API client interfaces, request/response mapping
- Testing Patterns: Mock interfaces, test data factories, assertion helpers
- Logging & Monitoring: Structured log types, metric interfaces, health check patterns
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2d ago First seen · 229 lines · 35 tokens per session scan A 6fa1ea78904f
typescript-master is an agent published in the GitHub repository agentsea/flashbacker (57 stars, last pushed 7mo ago), licensed MIT. It adds 35 tokens to every session and 2,273 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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