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# The Developer Experience

### Agentic Cloud Delivery Platform

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# Two consumer paths, one safety envelope

![w:1100](assets/png/developer-experience-01b-scope-boundary.png)

- **Technical developer** — owns app code + a contract + a thin CI definition
- **Citizen developer** — declares intent; an AI agent produces a contract that passes the **same** safety envelope
- **Upstream is anything** — IDE, agentic SDLC, or vibe coding. ACDL doesn't care how the contract was produced
- **ACDL is infrastructure only** — provisions and governs AWS resources. Application deployment is upstream

---

# The platform at a glance

![w:1100](assets/png/platform-architecture.png)

- **You own the left edge** — app code and a contract. That is the entire consumer surface
- **The platform owns the middle** — pipeline, catalog, adapter, environments, gates, evidence
- **Two surfaces, one pipeline, one evidence stream** — senior engineer and citizen dev converge on the same safety envelope
- **The bar rises automatically** — confidence signal + HITL gates scale with the target environment, not a ticket

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# Three things. The entire consumer surface.

<img src="assets/png/developer-experience-02-what-dev-does.png" style="float: right; width: 38%; margin-left: 20px; margin-bottom: 10px;" />

- **1. App code** — the consumer's service, at the top level of the repo
- **2. A contract** — a single YAML file: id, name, environment, infrastructure

```yaml
id: msvc
name: microservice
environment: dev
infrastructure:
  microservice:
    version: "1.0.0"
    inputs:
      cpu: 256
      memory: 512
      desired_count: 2
      port: 8080
```

- **3. A one-line CI definition** — a thin `uses:` wrapper pointing at a versioned platform workflow
- The developer does **not**: write modules, clone the platform repo, hold cloud credentials, or maintain a state backend

---

# See what the platform does, in real time

- **Streamed output by default** — the plan, policy results, and each check record flow to stdout
- **PR comments after every successful pipeline stage** — always know where you stand
- **Clear, explainable halt reasons** — a policy violation, an insufficient signal, or a missing attestation. **Never opaque.**
- **Connection strings posted as PR comments** — human-readable, no hunting. Runtime secrets go to encrypted Parameter Store, never to logs
- **Errors become GitHub issues, automatically** — a failed deploy opens an issue on the platform repo

---

# Pick from pre-built, security-reviewed blocks

![w:1100](assets/png/developer-experience-05-catalog.png)

- **Primitives** — single-purpose resources (S3, VPC, ECS, IAM, ALB, ECR, CloudFront, WAF, RDS)
- **Modules** — composed patterns (static site with CDN + WAF; microservice with VPC + ECS + ALB + ECR)
- **Validated examples per module** — `simple.yaml` + `complex.yaml`, validated against the contract schema in CI
- **Auto-promotion of patterns** — after 3 observed usages <span class="badge planned">Planned</span>

---

# The bar rises automatically with sensitivity

![w:1000](assets/png/developer-experience-04-promotion-journey.png)

| Environment | What the platform adds | Maturity |
|---|---|---|
| dev | Confidence ≥ 0.50, fully autonomous | — |
| qa | QA human attestation + confidence ≥ 0.75 | <span class="badge planned">Planned</span> |
| prod | SRE human attestation + confidence ≥ 0.90 | <span class="badge planned">Planned</span> |
| dr | SRE human attestation + confidence ≥ 0.95 + DR drill | <span class="badge planned">Planned</span> |

- **No staging environment** — dev is the only autonomous environment
- **Separation of duties** — the QA approver cannot be the prod approver

---

# Tearing down is as gated as deploying

![w:1100](assets/png/developer-experience-07-decommission.png)

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```yaml
uses: acdl/.github/workflows/deploy.yml@v1.12
with:
  contract: .acdl/contract.yml
  mode: decommission
  changeRequestId: "CHG0678912"
```

- **Validate the change request** — platform queries the CMDB; CR must be `approved` and match the consumer repo
- **Two SRE human-attestation gates** — disable protection → SRE approves → zero counts + destroy → second SRE approves
- **Per-stack encryption key enters a grace window** (default 30 days) so encrypted data remains recoverable

---

# You control when you absorb improvements

![w:1100](assets/png/developer-experience-08-semver.png)

- **Floating MAJOR + MINOR tags** (e.g. `@v1.12`) — automatically receive patch updates within the line
- **Semantic versioning with a clear contract:** interface → MAJOR, behavior → MINOR, lifecycle → PATCH
- **Pin to an exact version** for stability, or float on MAJOR only (`@v1`) to absorb new features on your own cadence
- **Unversioned references (`@main`, bare) are discouraged** — the versioned tag is the only immutability lever
- **Automated release job** computes the next semver on merge to main, creates the tag, and updates floating tags

---

# Fails gracefully, not opaquely

First impressions of a platform are made **when it fails for the first time.** The platform fails gracefully.

When no environment is bound, the platform emits a **user-friendly onboarding prompt** instead of failing opaquely:

1. That no environment is bound to their repo yet
2. What the platform will provision on their behalf (account, network, state, role)
3. The expected turnaround for the platform team to grant the environment
4. How to request an environment

The pipeline then **exits without attempting a deployment** — no partial state, no confusing errors.

<span class="badge planned">Citizen developer onboarding path: planned</span>

---

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# The desired outcomes

- **Velocity without sacrificing safety** — speed in ergonomics, safety in unbypassable gates
- **Security, observability, compliance as platform defaults** — not per-team effort, not post-hoc remediation
- **Auditability as a byproduct, not a project** — every change traceable to a human attestation and a tamper-evident evidence event
- **Blast radius contained by design** — OIDC + ABAC, only your own tagged resources
- **The bottleneck moves off the platform team's ticket queue** — a merged change progresses without a platform engineer joining a thread
- **Infrastructure as a utility, not a craft** — consume, don't maintain
- **A path to the citizen developer** — same envelope, senior engineer or non-technical

---

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# Appendix

**Contents:**

1. The Citizen Developer Experience (full)
2. No Platform Code, No Cloning (detail)
3. Local Reproducibility (detail)
4. The Road to the North Star (phased roadmap)
5. Glossary
6. Operating Model & Cost
7. Verified by Construction

---

# A1 — The Citizen Developer Experience

A non-technical consumer ships a production deployment **by declaring intent** — without authoring a workflow, a configuration file, or an infrastructure module.

- The consumer opens an issue describing what they need (e.g. "a web API for the pricing service")
- An AI agent maps the intent to a contract referencing a module from the **reviewed skill catalog**
- The contract enters the **same pipeline** and must clear the **same confidence gate** before promotion

**Guardrails that make this safe:**

- Skills are **versioned, signed, and reviewed for sensitive data before release** (Infra & Ops owns the review)
- Agents are **stateless** — all state lives in the platform; the platform trusts and **always verifies**
- The agent's trace and submission confidence are captured in the contract for review

<span class="badge planned">Skill catalog + real agent runtime: planned</span>

---

# A2 — No Platform Code, No Cloning

Consumers `uses:` a **versioned** central workflow. The platform fetches itself at run time. The consumer **never touches platform internals.**

![w:1000](assets/png/developer-experience-03-no-cloning.png)

- The consumer's CI definition is a thin wrapper — one `uses:` line
- The runner checks out the consumer repo, then checks out the platform repo into the workspace
- The platform installs its own runtime dependencies — the consumer installs nothing
- When the platform ships a fix, every consumer on a floating tag gets it on their next run

---

# A3 — Local Reproducibility

The entire CI pipeline runs **from the shell**, not just in CI.

- `scripts/run_ci.sh` mirrors the CI pipeline locally — the same three stages (lint → test → check-only) in sequence
- `scripts/run_platform.sh --check-only` runs the platform **offline** — no AWS, no policy engine, no outbox required. Validates a contract end-to-end before pushing
- `--plan-only` runs through the infrastructure plan without applying
- The CI and deploy pipelines are defined by **declarative contracts** (YAML instances validated against JSON Schemas) — a single source of truth that both workflows implement

---

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# A4 — The Road to the North Star

*Proposed phasing — not formally planned.*

![w:1100](assets/png/road-to-north-star.png)

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# A5 — Glossary

| Term | Meaning |
|---|---|
| **OIDC** | OpenID Connect — federation protocol for short-lived tokens, no long-lived credentials |
| **ABAC** | Attribute-Based Access Control — access scoped by resource tags + repo identity, not roles |
| **CMK** | Customer-Managed Key — per-stack encryption key, 90-day rotation, no shared keys |
| **CMDB** | Configuration Management Database — validates change requests for decommission |
| **RPO** | Recovery Point Objective — RPO = 0 means evidence is written synchronously, no data loss |
| **HITL** | Human-in-the-Loop — deliberate human attestation required for qa/prod/dr environments |
| **VCS** | Version Control System — the git hosting platform (GitHub, Gitea, GitLab) |
| **NFR** | Non-Functional Requirement — encryption, tagging, observability standards |

---

# A6 — Operating Model & Cost

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ACDL runs at **zero cloud cost** for day-to-day development. AWS spend was measured via Cost Explorer (`COST.md`, 2026-07-28):

| Metric | Value |
|--------|-------|
| Total spend (8 days) | **$0.001883** |
| Daily average | $0.000235 |
| Projected monthly | ~$0.007 |
| Peak day | 2026-07-27 ($0.000867) |

- **Local emulators are the primary tier** — the full pipeline runs in-process, no AWS credentials
- **Live-AWS verification is milestone-scoped, then torn down.** The pipeline now **defaults to plan-only** on every PR; `ACDL_LIFECYCLE_MODE=full` overrides to apply→destroy for milestone verification (REQ-134, v1.12).
- **Cost drivers** are spike-scoped: Terraform plan reads (free), S3 state storage (cents), DynamoDB outbox (cents). No running infrastructure between milestones.

**Pre-mortem (`PRE_MORTEM.md`):** the v1.10 decay incident (diff-scoped VERIFY missed 7 adapter defects) is the root pattern: *a claim outruns the verification that backs it.* Four forward failure modes + structural mitigations (regression-tested IAM baseline, mandatory teardown, verified-only deck claims, honest scope).

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# A7 — Verified by Construction

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Two architectural pillars make "Verified" a structural property, not a claim:

- **The stateless adapter (918 → ~80 lines).** The Terraform adapter was a 918-line monolith with 3 constant tables and 39 type-specific branches. It is now a ~80-line **stateless assembler**: it owns no module content — no resource shape, no nested HCL blocks, no defaults. Each L1 module ships a real `terraform/` module dir owning its shape, nested blocks, and defaults. The adapter reads the registry and emits `module "x" { source = ... }` blocks. A new module is a new terraform dir, not a code change. *(The v1.12 P67 fix closed a dedup defect for multi-resource L1s — ecs-service, alb; CAP-013 now Verified.)*
- **Pipeline-driven lifecycle testing.** A `modules-lifecycle` pipeline matrix-runs each L1 and L2 module's contracts through apply→modify→destroy against live AWS. **The "test" = the pipeline cell going green.** Defaults to **plan-only** on every PR (fast, no AWS mutation, no cost); `ACDL_LIFECYCLE_MODE=full` overrides to the real apply→destroy for milestone verification (REQ-134, v1.12). The regression gate (D-091) re-runs all 22 capabilities at milestone completion — **22/22 Verified** as of v1.12.

The v1.10 lesson is the negative space: a 918-line adapter with type-specific branches decayed silently. The ~80-line stateless adapter + the milestone regression gate are the structural fix.