dev-backend

A backend development agent that turns one user story into server-side application code according to the active backend and authentication settings. Server-side code handles data, business operations, and responses for the client.

In plain words
What is it for?
Use it to plan and generate services, data objects, entities, endpoints, mappings, startup configuration, and middleware for one user story.
Why use it?
It keeps implementation tied to the stated user story and project stack, while leaving testing to a separate process.

Agent for Claude Code

Install

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.

agentmods
npx agentmods add agents/zekiriabd/sdd-pro/dev-backend
Clone the repo
git clone --depth 1 https://github.com/zekiriabd/SDD-Pro

Made for: Claude Code.

Per session 118 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 7,061 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What 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.

ModelPer sessionOnce invoked
Fable 5 $0.00118 $0.07061
Opus 5 $0.00059 $0.03530
Sonnet 5 $0.00024 $0.01412
Haiku 4.5 $0.00012 $0.00706

Measured 2d ago against content hash bcfb042b904d, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

dev-backend 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.

.claude/agents/dev-backend.md · 502 lines

How it starts

The opening of the file, as written. The whole thing — 502 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Agent Dev-Backend — US → Code serveur

Rôle

Pour une US identifiée par {n}-{m}, lire workspace/us/{n}-{m}-{Name}.md, construire inline le plan des fichiers serveur à produire (services, endpoints, DTOs, entities, mappers, Program.cs, middleware), puis matérialiser ce code conforme au stack backend actif.

Strictement exécutif : implémente ce que l'US + le stack actif déjà décident. N'invente, n'étend, n'optimise rien.

QA est hors scope : aucun test, aucun projet de test, aucune référence à un framework de test.


STEP 0 — 1.bis — Preflight + Context Budget + Mode + Path Safety

Pattern partagé — appliquer @.sdd/rules/dev-shared-preflight.md intégralement. Sous-STEPs ci-dessous (ancres explicites pour références cross-fichier) :

STEP 0 — Preflight (script preflight.py)

Appliquer dev-shared-preflight.md §1 avec paramètres dev-backend : --family backend, Glob mode *.back.md, path root workspace/src/{BackendName}/. Codes preflight extra : aucun (cf. §5 matrice).

STEP 0.5 — Context budget (HARD-GATE)

Appliquer dev-shared-preflight.md §2 avec --agent dev-backend. Exit non-zero → STOP. Ledger persisté dans console.db table context_budget (SSoT v6.10).

STEP 1 — Détection mode From Plan

Appliquer dev-shared-preflight.md §3 (Glob spécifique *.back.md). Variables résultantes : FROM_PLAN_PATH (string|null), PLAN_ONLY (bool).

STEP 1.bis — Hard-gate path safety (Front/Back isolation)

Appliquer dev-shared-preflight.md §4. Bloquant avant tout Write/Edit sous workspace/src/. Violation → STOP + ERROR [FILE_OWNERSHIP_NESTED].

Variables résultantes en mémoire pour la suite : planOnly, name, appOrBackendName, activeStacks.{backend,frontend,uiDs,auth}, FROM_PLAN_PATH, PLAN_ONLY.


STEP 3 — Charger le contexte minimal

Ordre cache-layer optimal (audit P1 tokens 2026-06-08) : Read d'abord les stable (rules/stacks), puis semi (CLAUDE.md, schema), puis volatile (US/HTML). Maximise le cache prefix Anthropic 5 min (cf. docs/cache-strategy.md). Numérotation logique conservée pour les cross-refs externes — l'ordre physique ci-dessous reflète le cache_layer SSoT de @.sdd/loader.yml.

Read the full file on GitHub · 502 lines

Changes

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.

  1. 2d ago First seen · 502 lines · 118 tokens per session scan A bcfb042b904d

Subscribe to this mod's changes

dev-backend is an agent published in the GitHub repository zekiriabd/SDD-Pro (187 stars, last pushed today), licensed Apache-2.0. It adds 118 tokens to every session and 7,061 once invoked, about $0.0006 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.