# Symfonyapi Platform Versioning > Deliver robust API Platform contracts in Symfony with explicit operations, mapping, and policy-safe behavior. Use for api platform versioning tasks. Use when this capability is needed. - Skill: `tomevault-io/symfonyapi-platform-versioning` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/symfonyapi-platform-versioning` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/symfonyapi-platform-versioning/raw - Safety review: pending - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Integrations & APIs - Author: tomevault-io (https://skillmd.com/u/tomevault-io) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/tomevault-io/symfonyapi-platform-versioning --- # Api Platform Versioning (Symfony) ## Use when - Designing or evolving API Platform contracts and operations. - Aligning serialization, validation, and security behavior. ## Default workflow 1. Define operation-level contract and payload boundaries. 2. Implement resource/DTO/provider/processor changes with explicit mapping. 2. Apply operation-specific validation and security constraints. 2. Validate functional behavior across happy and negative paths. ## Guardrails - Keep API contract explicit and version-aware. - Avoid exposing internal entity fields implicitly. - Prevent drift between docs and actual serialization. ## Progressive disclosure - Use this file for execution posture and risk controls. - Open references when deep implementation details are needed. ## Output contract - API artifacts changed (resource/DTO/provider/processor). - Contract/security decisions and rationale. - Functional verification results. ## References - `reference.md` - `docs/complexity-tiers.md` --- > Converted and distributed by [TomeVault](https://tomevault.io/claim/makfly) — claim your Tome and manage your conversions.