devenv — environment wizard (often hybrid, not “all-local”)

Use as a wizard: confirm what runs where, then align .env / .env.local and Compose accordingly.

What “devenv” usually means here

• devenv ≠ “everything in Docker Compose.” Many setups use real or shared backends via .env only: e.g. RDS (Postgres), managed Kafka, hosted ClickHouse, Temporal Cloud.
• devenv = “run the FlexPrice binaries / processes you care about locally” while credentials and endpoints live in .env / .env.local (FLEXPRICE_POSTGRES_*, FLEXPRICE_KAFKA_BROKERS, etc.). Treat those files as the source of truth for hosts, ports, SSL, IAM-style wiring the app understands.
• Only spin up Docker (or localhost services) for pieces the user names as local. Example: Postgres on RDS + only Kafka + Temporal in Compose → docker compose up -d kafka temporal temporal-ui (and anything else they list); do not insist on postgres containers or §E1 blindly.
• §C “127.0.0.1 + Compose defaults” is one recipe — the RDS / cloud variant is: omit or comment conflicting lines, set FLEXPRICE_POSTGRES_HOST (and reader, SSL mode, passwords) to the managed endpoints from .env, and verify connectivity with their toolchain (psql, VPN, bastion docs) rather than docker compose exec postgres.

If the user hasn’t said what’s local vs remote, ask once: Which deps are localhost/Compose vs RDS or other hosted?

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§L — Local-first creds for migrations, seeds, make migrate-*, and local processes

Unless the human explicitly said Postgres/ClickHouse/Temporal are remote (RDS, hosted CH, Temporal Cloud):

1. Treat .env.local as the safety rail for anything that runs Go on the host (API, worker, make run-local-*, go run cmd/migrate/main.go / migrate-ent, codegen that opens DB if applicable). Base .env often repeats staging or shared URLs from onboarding. migrate-ent reads FLEXPRICE_* like the server — before running it against Compose Postgres, ensure §C1 is in .env.local (later wins after sourcing .env then .env.local with set -a) or override in the invoking shell. Hosts must be 127.0.0.1, Kafka localhost:29092, SSLMODE=disable — never Compose DNS names (postgres, kafka:9092, clickhouse:9000) from macOS/Linux host processes.

2. Makefile targets that only docker compose exec into Postgres/ClickHouse/Kafka (this repo typically includes migrate-postgres, migrate-clickhouse, seed-db, init-kafka) execute inside Compose with the Compose image defaults (flexprice / flexprice123, exec via service names). Those are implicitly local as long as the stack is docker compose up — they ignore stray FLEXPRICE_POSTGRES_* in .env for the psql / clickhouse-client invocation (still harmless to keep §C1 in .env.local).

3. Before migrate-ent or run-local-*, run rg probes from §B. If FLEXPRICE_POSTGRES_HOST resolves to postgres (Docker-only hostname) or any non-local host while intending Compose-backed local DB, fix .env.local first (§C1**)** — do not rely on .env alone.**

4. Pattern for shell one-liners when any step uses host Go + env files:

   set -a && [ -f .env ] && . ./.env; [ -f .env.local ] && . ./.env.local; set +a && make migrate-ent
   

   (Use migrate-postgres / migrate-clickhouse / seed-db as written in the Makefile; those targets use Compose exec against the container. Add §C1 overrides in .env.local whenever you combine with migrate-ent or app servers in the same session.)

5. When Postgres/ClickHouse/Temporal are intentionally RDS/managed (§C0), §L does not apply — migrations and binaries must target those FLEXPRICE_* values and never §C1 unless explicitly requested.

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§M — Effort gauge & Cursor model tier (dynamic)

Before (and while) running devenv, estimate effort so the session uses the lightest sensible model—and rescales upward when evidence shows deeper work.

Workload tiers (snap once, revise after failures)

Tier	Signal	Typical devenv examples
S · light	Single known-good path, cookbook steps, shallow logs	docker info, docker compose ps, pg_isready, one-shot curl health, rg §B read-only probes, confirm §C1 snippets exist
M · medium	Few services in dependency order; .env/Compose nuance (§L, migrate-ent vs Compose-exec migrate-*)	§E1 converge + migrations + seed-db, topic prompt (§0.K), consumer-group tweaks (§D), run-local-* sanity
L · heavy	Ambiguous topology (RDS + Compose + Temporal split), flaky cross-network (VPN/IP allowlists), obscure migration/offset/topic interplay, §F loops without convergence across several rounds	Debugging “host vs container DNS”, wrong-cluster risk, Temporal visibility DB vs app Postgres divergence, §C0 stacks

Escalate S → M → L as soon as a step fails unexpectedly or stakes rise (anything that might touch production-adjacent creds ⇒ treat as ≥ M, often L).

Matching Cursor Agent / Composer models (names drift by product UI)

Treat “model” labels as capability tiers, not exact marketing strings (Settings → Models in Cursor picks the SKU).

Tier goal	Typical pick	Reserve for
Fast / economical	Composer (Fast) — or your default fast slot	S checklists only
Balanced	Composer, GPT-5-class, or baseline Sonnet	M most sessions
Strongest reasoning (ceiling)	Claude Sonnet 4.x — Sonnet 4.7 (or newer in the 4.x line) when Cursor lists it as the strongest Sonnet tier; Opus / thinking variants if heavier than Sonnet per UI	L only — multi-hypothesis infra, RDS/staging bleed, Temporal + Kafka + env correlation

Rules:

1. Start at S staffing (fast) if user said “bring stack up” and shape is Compose-only + §L locked.
2. Jump to balanced immediately whenever editing .env.local, interpreting migrate-ent errors, or coordinating Kafka + Temporal + Postgres.
3. Tier L (strongest reasoning): Prefer Claude Sonnet 4.x capped at Sonnet 4.7 when that is the strongest Sonnet in Cursor Settings → Models; switch to Opus / thinking-heavy tiers only if UI marks them heavier than Sonnet. Use L for hybrid RDS/managed, security-group/VPN uncertainty, contradictory signals after §B probes, or explicit risk review before commands.
4. Subagents & parallelism: follow §N — fork Cursor Task subagents when workloads are independent; keep cheap tiers on scripted subagents and tier L on parent for integration / contradictions (§N).
5. Never burn top tier on rote docker compose ps without a blocker—rescope down once green.

Tell the human when tier bump pays off (“open a new Composer with Sonnet 4.7 for RDS + Temporal triage”). If the Cursor UI exposes automatic routing, brief them on tier target (S/M/L) so presets align.

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§N — Subagents (Task tool) & safe parallelism

Use Cursor subagents (the Task tool: generalPurpose, explore, shell, etc.) when work splits cleanly — better wall-clock latency and sharper focus if prompts are complete (subagents do not see prior chat turns).

When to deploy subagents (do parallelize here)

Launch multiple subagents in one message (same round) only when branches are orthogonal:

Parallel tracks	Typical prompt shape
§F probes split	One agent: Postgres pg_isready + Compose postgres logs tail hint; another: kafka-topics --list; another: curl ClickHouse :8123/ping / HTTP; fourth: Temporal UI / 7233 reachability (read-only probes). Merge in parent → single green/red matrix
Read-only codebase + ops	explore: grep/find how migrate-ent or FLEXPRICE_* bind in cmd/migrate + internal/config; sibling explore or shell: docker compose ps + image pull progress (if heavy, shell + run_in_background: true for long pulls
L‑tier investigations	Parent stays Sonnet ceiling (§M); children run cheap explore/shell for evidence gathering (no rewriting .env.local concurrently from two writers — serialize edits)

Background long jobs: docker compose up, image pulls, make migrate-* waits → shell run_in_background: true; parent continues planning or launches other probes that do not contend on Docker lock.

When not to parallelize (serialization required)

• Stateful env: one owner edits .env / .env.local (§L); subagents report recommended lines, parent applies once.
• Order-sensitive DB: migrate-postgres / migrate-clickhouse → migrate-ent → seed-db (§L, §E1) unless Makefile explicitly proves independence — assume pipeline order.
• Single Docker daemon storms: avoid four simultaneous docker compose build --no-cache; cap concurrent heavy Compose mutations.
• Kafka topic creation (§0.K**):** one decision-maker — never duplicate make init-kafka against shared clusters.

Prompt hygiene for Task subagents

Each subagent prompt must embed: repo path, intent (“read‑only probe” vs “run X if safe”), exit criteria (“return stdout + last exit code”), forbidden actions (no secrets in reply, no init-kafka without YES). Use readonly: true for explore when edits are out of scope.

Parent-agent merge checklist

After parallel returns: reconcile contradictions (Postgres UP but migrate-ent DSN mismatch ⇒ §L/§B), bump §M tier (L) if triage spikes, avoid double-counting success from duplicate probes.

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0. Idempotent Docker preflight (when Compose is in play)

Goals: avoid useless failures, redundant pulls, or duplicate work when infra is already fine. Skip heavy Compose paths when the stack is fully remote except app processes on the laptop.

0.1 Docker daemon

docker info >/dev/null 2>&1 && echo OK || echo NO_DOCKER

• If NO_DOCKER: stop — instruct the human to start Docker Desktop, OrbStack, Colima, Rancher Desktop, etc. (their platform). Optionally: colima status / docker context ls hints. Do not loop forever; wait for confirmation.

0.2 What is already running? (reuse healthy stack)

Repo root (docker-compose.yml present):

docker compose ps -a --format json
# Human-readable shorthand:
docker compose ps

• Check only services the user relies on locally — e.g. if DB is RDS, ignore postgres in Compose for “ready” semantics (still fine if an old postgres container exists unused).
• If each Compose-backed dependency they use (kafka, clickhouse, temporal, etc.) already running (+ healthy/ready per compose): skip duplicate docker compose up -d unless they asked for recreate / compose changed materially.
• Idempotent converge: docker compose up -d … for that subset remains safe — prefer checking first to reduce chat noise.

0.3 App images (flexprice-api stack)

Before make build-image / make dev-setup:

docker images flexprice-app:local --format '{{.Repository}}:{{.Tag}}'

• Missing image:** expected before first build — OK to docker compose build flexprice-build or make build-image once daemon is UP.
• Caches: rebuild only if Dockerfile / deps / user requests –no-cache — avoid needless full rebuild declarations.

0.4 When user wants “reset” vs “soft start”

Intent	Typical action
Soft idempotent	docker compose up -d … reconcile only
Nuclear	make clean-docker / down -v — destructive, warn first

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0.K Kafka broker choice (Compose default vs lighter alternatives)

Supported default (this repo)

• docker-compose.yml wires Confluent cp-kafka with EXTERNAL listener localhost:29092 and make init-kafka/docker compose exec kafka … kafka-topics CLIs assumed.
• FLEXPRICE_KAFKA_BROKERS for hybrid host binaries:** localhost:29092 (matches advertised listener).

“Can I use Redpanda / Kafka KRaft / other lightweight Kafka-compatible broker?”

• Prefer real Kafka-compat + same listener story until you validated Sarama/Watermill against the substitute.
• Redpanda (or embedded KRaft): possible locally only if:
  • Network & listener reach localhost:29092 (or you change .env.local brokers consistently everywhere).
  • Topic/partition tooling equivalents exist — make init-kafka is kafka-specific CLI paths; swapping broker ⇒ adapt or run topic creation manually against the new tooling.
  • Auto-create OFF replicated — topics must still exist (kafka.auto.create.topics.enable: false pattern).
• Agent stance:** Recommend stock Compose Kafka unless user explicitly commits to maintaining alternate compose.** Document lightweight swap as advanced / unsupported upstream parity.

Default Kafka topics (ask, then maybe create)

When bringing Kafka online or finishing a Compose Kafka setup (not assumed):

1. Ask explicitly: “Create the repo’s default FlexPrice topics (same names as make init-kafka)?” Yes / no — never run topic creation silently against shared clusters.
2. If Compose kafka and yes → from repo root, after Kafka responds to kafka-topics --list:

make init-kafka

3. If managed / non-Compose broker | yes → make init-kafka will not run (docker compose exec kafka …). Recreate the same topic names with their toolchain (MSK console, kafka-topics against SASL/SSL bootstrap, IaC). Mirror Makefile’s init-kafka list: events, events_lazy, events_dlq, events_backfill, events_post_processing, events_post_processing_backfill, system_events, wallet_alert, onboarding_events, staging_benchmarking, prod_events_v4, staging_events_backfill, staging_events (partitions/replication/placement policy per their policy, not blindly 1/local).
4. If no → skip; user may rely on IaC / existing topics. Warn if app logs complain unknown topic / UNKNOWN_TOPIC_OR_PARTITION.
5. Webhook naming: config.yaml may expect flexprice_system_events while make init-kafka creates system_events — align topic name with config or extend creation list (§G).

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A. Natural language → intent (maps user chatter to actions)

First clarify stack shape when they mention RDS, staging DB, “only Kafka local”, etc.: map each dependency to .env vars vs Compose service name.

Interpret phrases like:

User says	Interpret as
start local server / API only / run API	Hybrid, FLEXPRICE_DEPLOYMENT_MODE=api — use make run-local-api (or Compose flexprice-api)
start consumer / run consumer	Hybrid, FLEXPRICE_DEPLOYMENT_MODE=consumer — make run-local-consumer
start Temporal worker / temporal mode	Hybrid, FLEXPRICE_DEPLOYMENT_MODE=temporal_worker — go run fragment in §C4 (no dedicated Makefile alias today)
everything in one process	mode=local — make run-local (needs Kafka infra)
full Docker / dev-setup	make dev-setup
change consumer group for local testing	Edit .env.local — §D (pick the right FLEXPRICE_* key)

When Kafka is part of setup, follow §0.K “Default Kafka topics” — prompt before make init-kafka unless the user already said yes to creating default topics in the same turn.

If unclear, confirm: binary on host vs Docker, which backends are Compose vs RDS/managed, and whether infra is already reachable (VPN, SSO, IP allowlists).

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B. Inspect .env / .env.local with grep (required technique)

Before telling the user to paste secrets:

1. Repo root. Prefer read-only probes:

# Keys only-ish: still may show assignment values — summarize carefully
rg '^[[:space:]]*FLEXPRICE_(DEPLOYMENT_MODE|POSTGRES_|KAFKA_|CLICKHOUSE_|TEMPORAL_|EVENTPROCESSING_|WEBHOOK_)' .env .env.local 2>/dev/null || true

# Lines that MUST be commented/disabled when app runs ON HOST against Docker infra:
rg '^[[:space:]]*FLEXPRICE_(POSTGRES_(HOST|READER_HOST)|KAFKA_BROKERS|CLICKHOUSE_ADDRESS|TEMPORAL_ADDRESS)' .env .env.local 2>/dev/null || true

2. When reporting in chat, redact values after = for PASSWORD, SECRET, KEY, TOKEN, DSN (show first/last 2 chars only or ***).

3. Edit strategy: use apply_patch/search_replace to comment problematic lines (prefix # ) rather than deleting history. Add correct host-oriented lines under a banner in .env.local:

# --- Managed by Cursor devenv skill: hybrid (host app) ---

Never commit .env / .env.local secrets; .gitignore usually excludes them.

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C. Hybrid host binaries — .env.local correctness

Local-first migrations & services: §L (host Go → always §C1 in .env.local when Postgres is Compose on localhost).

Use rg §B before editing. Makefile run-local-* sources .env then .env.local — set -a; later wins.

C0 RDS / managed Postgres (no local postgres container)

• Set FLEXPRICE_POSTGRES_HOST / FLEXPRICE_POSTGRES_READER_* / FLEXPRICE_POSTGRES_SSLMODE (often require) / password from .env or .env.local per your org’s RDS doc — never paste secrets into chat.
• Comment out Compose-only aliases (postgres) in .env if they hijack run-local-* precedence.
• Do not require docker compose exec postgres for “green” — use app startup, psql to their endpoint, or DBA-approved checks.

C1 Lines to enable when Go runs on macOS and Postgres/Kafka/ClickHouse/Temporal are Compose on localhost

FLEXPRICE_POSTGRES_HOST=127.0.0.1
FLEXPRICE_POSTGRES_PORT=5432
FLEXPRICE_POSTGRES_USER=flexprice
FLEXPRICE_POSTGRES_PASSWORD=flexprice123
FLEXPRICE_POSTGRES_DBNAME=flexprice
FLEXPRICE_POSTGRES_SSLMODE=disable
FLEXPRICE_POSTGRES_READER_HOST=127.0.0.1
FLEXPRICE_POSTGRES_READER_PORT=5432

FLEXPRICE_KAFKA_BROKERS=localhost:29092

FLEXPRICE_CLICKHOUSE_ADDRESS=127.0.0.1:9000

FLEXPRICE_TEMPORAL_ADDRESS=127.0.0.1:7233

C2 Lines to #-comment out when they point at Docker DNS (wrong on host)

Typical killers:

# FLEXPRICE_POSTGRES_HOST=postgres
# FLEXPRICE_POSTGRES_READER_HOST=postgres
# FLEXPRICE_KAFKA_BROKERS=kafka:9092
# FLEXPRICE_CLICKHOUSE_ADDRESS=clickhouse:9000
# FLEXPRICE_TEMPORAL_ADDRESS=temporal:7233

C3 Don’t confuse make run-server

Runs go run cmd/server/main.go without sourcing .env / .env.local. Prefer make run-local-*.

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C4 Commands per deployment mode (host / hybrid)

Mode	Meaning	Command (host)
api	HTTP API only; ingestion handlers gated off in router	make run-local-api
consumer	Kafka-heavy process; make dev-setup’s flexprice-consumer equivalent	make run-local-consumer
temporal_worker	Temporal workers + minimal router (see cmd/server/main.go)	Same env loading pattern; Makefile has no alias → run: (set -a && [ -f .env ] && . ./.env; [ -f .env.local ] && . ./.env.local; set +a && FLEXPRICE_DEPLOYMENT_MODE=temporal_worker go run cmd/server/main.go)
local	Single process (API + consumer path + Temporal where applicable) — Kafka mandatory per cmd/server/main.go	make run-local

Explain Temporal worker rarely needs :8080 — §F pings differ.

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D. Consumer groups for local experimentation

Goals: avoid clashing teammates’ offsets or isolate consumers against the same topics.

Nested YAML overrides use FLEXPRICE_<SECTION>_<FIELD> (upper snake). When ambiguous, grep consumer_group in internal/config/config.yaml and match mapstructure in internal/config/config.go.

Pipeline (YAML)	Typical env
kafka.consumer_group	FLEXPRICE_KAFKA_CONSUMER_GROUP=<unique>
event_processing.consumer_group	FLEXPRICE_EVENTPROCESSING_CONSUMER_GROUP=<unique>
event_processing_lazy.consumer_group	Often FLEXPRICE_EVENTPROCESSINGLAZY_CONSUMER_GROUP — confirm via startup logs
meter_usage_tracking, wallet_balance_alert, webhook.consumer_group, etc.	Derive FLEXPRICE_<PARENT_CAPS>_CONSUMER_GROUP from nesting

Practical discipline:

1. Change only the groups you need to isolate.
2. kafka-consumer-groups / startup logs prove the effective id.
3. If ineffective, grep BindEnv in config.go for explicit binds.

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E. Recipes — Docker infra (minimal practical)

Run §0 first (daemon + docker compose ps) only when the user wants some Compose services. RDS for Postgres: use C0 + start Kafka/ClickHouse/Temporal subsets as needed; repo Temporal often still wants Postgres somewhere — if entirely off Compose, confirm Temporal + visibility DB story (managed Temporal Cloud vs local Temporal + remote DB vs full Compose).

Compose Temporal depends_on: postgres — cannot drop Postgres from this Compose file if using bundled Temporal unless you intentionally run Postgres elsewhere compatible with that compose Temporal config.

E1 Hybrid infra (postgres kafka clickhouse temporal temporal-ui)

Prerequisite (§L**): .env.local must provide Compose-on-host Postgres/ClickHouse (and Temporal if needed for commands) §C1 so make migrate-* / seed-db hit local containers, not any staging/RDS values left in .env.

docker compose up -d postgres kafka clickhouse temporal temporal-ui
make migrate-postgres migrate-clickhouse generate-ent migrate-ent seed-db

Kafka topics: make init-kafka is optional — §0.K (ask first). If yes: make init-kafka once Kafka is reachable from Compose.

E2 Fully Docker apps

make dev-setup

Rebuild when Dockerfile / image deps shift: docker compose build flexprice-build then make restart-flexprice.

Kafka UI (--profile dev): docker compose --profile dev up -d kafka-ui → http://localhost:8084

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F. Verification loop (bounded; run until OK or escalate)

Pick MAX_ROUNDS (default 8) and SLEEP_SECONDS (default 4 unless hot path).

Build a minimal checklist from the user’s stack (RDS → skip Compose postgres checks; managed Kafka → skip docker compose exec kafka unless they still use Compose broker).