Scaffold Doctor

scaffold-doctor

Generates a production-ready "doctor" agent inside the target repo by following the pattern described in references/architecture.md. Read that file first — it defines the module table, data flow diagram, three run modes, and the error-isolation invariant that all generated code must preserve.

Interactive Flow

Ask questions one at a time, in the order listed below. Use multiple choice wherever possible. Stack questions come first because they determine which modules get generated and which swap-table rows apply.

Q1 — Stack

Ask each sub-question on its own turn.

1a. Language / runtime

1) TypeScript (default)
2) Python
3) Other — describe

1b. LLM provider

1) Amazon Bedrock (default)
2) Anthropic API direct

1c. Scheduler

1) AWS EventBridge + Lambda (default)
2) GitHub Actions
3) POSIX cron / systemd timer
4) Kubernetes CronJob

1d. VCS

1) GitHub (default)
2) GitLab

1e. Tracker

1) Linear (default)
2) Jira
3) GitHub Issues

1f. Chat

1) Slack (default)
2) Microsoft Teams
3) Discord

For any non-default choice, note which swap-table row applies (see references/swap-table.md) — generation will follow that row exactly.

Q2 — Product name

What is your application's name? (Used as the doctor's identity in the system prompt, e.g. "Acme Doctor".)

Free text. Store as PRODUCT_NAME.

Q3 — Target repo

What is the owner/name of the GitHub (or GitLab) repo the doctor will read from and open PRs against? (e.g. acme-corp/backend)

Free text. Store as REPO_SLUG.

Q4 — Log source

Which log groups should the doctor scan? List ARNs or names, one per line. Press enter twice when done. (Default: CloudWatch Logs; describe a different source if applicable.)

Collect as LOG_GROUPS[]. Default lookback: 60 minutes.

Q5 — Data source for audits

Which query tool should runbooks use?

1) AWS Athena (default)
2) Generic SQL (Postgres, MySQL, BigQuery…) — specify driver
3) Prometheus
4) None — runbooks use only log/metric/VCS tools

Store as DATA_SOURCE. For non-default choices, generation follows the matching swap-table row in references/swap-table.md.

Q6 — Model and region

Primary model ID and AWS region (Bedrock) or plain model string (Anthropic API)?

Defaults: us.anthropic.claude-sonnet-4-6, us-east-1. Press enter to accept.

Store as MODEL_ID and AWS_REGION. Fallback model defaults to us.anthropic.claude-haiku-3-5 (Bedrock) or claude-haiku-3-5 (Anthropic API).

Q7 — Budgets

Present defaults; user may override any or all.

Q8 — Runbook schedule assignment

The example runbook scan-logs will be registered as a daily runbook. Do you have additional runbooks to schedule now? (You can add more later with add-doctor-runbook.)

1) No, start with scan-logs only (default)
2) Yes — list names and daily/weekly for each

Collect DAILY_RUNBOOKS[] (starts with ["scan-logs"]) and WEEKLY_RUNBOOKS[] (starts empty).

Generation Directive

Once all answers are collected, generate the doctor engine by following the reference docs below. Do not restate their content — implement exactly what they specify.

Module list and file tree

Follow references/architecture.md — Module Responsibilities table and Default-Stack File Tree. Generate every listed module. For non-default stack choices, apply the relevant rows from references/swap-table.md before generating.

run-skill and prompts/system

Follow references/agentic-loop.md completely.

Port these two reference snippets verbatim (translated to the target language/stack):

• Model fallback (§5): the createMessage wrapper that retries once on the fallback model before propagating.
• Anti-loop guard (§4): the lastCalls tail-check that injects a nudge text block when the same tool fires three times in a row.

The system prompt must follow the four-section structure in §8 exactly:

1. Identity block — You are {PRODUCT_NAME} Doctor, an automated auditor for the {PRODUCT_NAME} platform.
2. Core behavioral contract (static prose as specified).
3. Known gotchas (empty placeholder — keep the heading).
4. Runtime context block + runbook content appended at run time.

The runbook section must always be separated by --- and the heading ## Skill to execute — do not rename this heading; the control tools depend on it.

repair-pipeline and repair-ci

Follow references/repair-pipeline.md for the full five-phase flow and CI auto-repair loop.

Port these reference snippets verbatim (translated to the target language):

• applySearchReplaceBlocks and parseSearchReplaceBlocks — exact regex and match-count semantics.
• selectWinner (single-file, repair-pipeline) — filter → group → sort → count≥2 threshold.
• selectWinningOutcome (multi-file, repair-ci) — majority threshold floor(N/2)+1.
• Syntax-validation seam: TypeScript → ts.transpileModule; Python → ast.parse; other stacks — see the validation table in the reference.

types and control tools

Follow references/finding-contract.md for:

• The full Finding schema (all required and optional fields).
• emit_finding tool definition — name and input schema must match exactly.
• skill_done tool definition — name and summary input must match exactly.
• Routing semantics (code → repair pipeline, heal_script → PR, manual → tracker).
• Dedup rules (stem-based for code; exact-signature for manual).

These strings are load-bearing — do not rename them:

• Tool name: emit_finding
• Tool name: skill_done
• System-prompt heading: ## Skill to execute

Project Scaffolding & Verification

For the default TypeScript stack, generate these files alongside the engine modules. They are required for typecheck and test to pass.

package.json

{
  "type": "module",
  "scripts": {
    "build": "tsc",
    "typecheck": "tsc --noEmit",
    "test": "vitest run"
  },
  "dependencies": {
    "@anthropic-ai/bedrock-sdk": "^0.12.0",
    "@octokit/rest": "^21.0.0",
    "@linear/sdk": "^27.0.0",
    "@slack/web-api": "^7.0.0",
    "@aws-sdk/client-athena": "^3.0.0",
    "@aws-sdk/client-cloudwatch-logs": "^3.0.0",
    "@aws-sdk/client-cloudwatch": "^3.0.0",
    "@aws-sdk/client-cost-explorer": "^3.0.0"
  },
  "devDependencies": {
    "typescript": "^5.5.0",
    "@types/node": "^22.0.0",
    "vitest": "^2.0.0"
  }
}

Swap SDK packages per the chosen stack (see references/swap-table.md). For Anthropic API direct, replace @anthropic-ai/bedrock-sdk with @anthropic-ai/sdk. For non-default VCS/tracker/chat, replace the matching SDK.

tsconfig.json

{
  "compilerOptions": {
    "target": "ES2022",
    "module": "ESNext",
    "moduleResolution": "bundler",
    "strict": true,
    "skipLibCheck": true,
    "resolveJsonModule": true,
    "types": ["node"],
    "outDir": "dist"
  },
  "include": ["**/*.ts"]
}

If deploying as a Lambda with esbuild bundling, moduleResolution: "bundler" is correct. For plain Node ESM without a bundler, use "moduleResolution": "node16" and add .js extensions to all relative imports.

skills/md.d.ts and runbook loading

The skills/index.ts module imports .md files as strings using bare import syntax. This requires:

1. A type declaration file skills/md.d.ts:

declare module "*.md" {
  const text: string;
  export default text;
}

2. A bundler loader that materializes .md as text. For esbuild (the default Lambda bundler):

esbuild index.ts --bundle --platform=node --loader:.md=text --outfile=dist/index.js

3. If no bundler is used (e.g. ts-node in dev), replace the import statements in skills/index.ts with readFileSync calls:

import { readFileSync } from "fs";
import { fileURLToPath } from "url";
import { dirname, join } from "path";
const __dirname = dirname(fileURLToPath(import.meta.url));
const scanLogs = readFileSync(join(__dirname, "scan-logs.md"), "utf-8");

Use whichever approach matches the deployment's build toolchain; both export the same bundledSkills: Record<SkillName, string> map.

Tool definitions: pure-data module

Keep tool input-schema definitions (the emit_finding and skill_done objects, plus all application tool definitions) in a pure-data module (tools/definitions.ts or exported from tools/index.ts) that imports no SDK packages — only types. The executor implementations (functions that call AWS SDKs, Octokit, etc.) live in separate files. This split lets tests import tool definitions to validate schemas without instantiating SDK clients.

Finalize scaffold

After generating all files, run:

npm install
npm run typecheck   # must exit 0
npm test            # must exit 0

Do not declare generation complete until both commands succeed.

Config Parameterization

LOG_GROUPS serialization: populate logGroups in config.ts as a JSON array literal, not a string. Example: logGroups: ["/aws/lambda/acme-api", "/aws/lambda/acme-worker"].

Model IDs: the default MODEL_ID value us.anthropic.claude-sonnet-4-6 is an Amazon Bedrock cross-region inference profile (the us. prefix routes across US regions). When the user selects Anthropic API direct (Q1b option 2), use plain model strings instead — see the LLM-provider row in references/swap-table.md for the mapping. The fallback model follows the same convention: us.anthropic.claude-haiku-3-5 (Bedrock) or claude-haiku-3-5 (Anthropic API direct).

Generate config.ts (or equivalent) populated with all collected answers:

export const config = {
  productName: "{{PRODUCT_NAME}}",
  repo: "{{REPO_SLUG}}",
  model: "{{MODEL_ID}}",
  modelFallback: "{{FALLBACK_MODEL_ID}}",
  region: "{{AWS_REGION}}",

  maxPrsPerRun: {{maxPrsPerRun}},
  maxTicketsPerRun: {{maxTicketsPerRun}},
  maxIterations: {{maxIterations}},
  maxTokensPerCall: {{maxTokensPerCall}},
  patchCandidates: {{patchCandidates}},
  maxRepairAttempts: {{maxRepairAttempts}},

  runbooksDaily: {{DAILY_RUNBOOKS}},
  runbooksWeekly: {{WEEKLY_RUNBOOKS}},

  // Per-runbook config — consumed by runbooks via the runtime context block.
  // The scan-logs runbook reads these fields directly.
  scanLogs: {
    logGroups: {{LOG_GROUPS}},
    lookbackMinutes: 60,
    errorThreshold: 10,
    knownNoise: [] as string[],
  },
};

The scanLogs block is required. The scan-logs runbook reads logGroups, lookbackMinutes, errorThreshold, and knownNoise from live config at step 1. Without these fields, the runbook's first step fails. Populate logGroups from LOG_GROUPS, and leave the remaining fields at their defaults unless the user overrode them in Q4.

Example Runbook Placement

Copy assets/runbooks/scan-logs.md verbatim into doctor/skills/scan-logs.md in the generated output. Register it in doctor/skills/index.ts and in config.runbooksDaily.

To add more runbooks later, use the add-doctor-runbook skill and follow references/writing-runbooks.md. That reference contains the runbook skeleton, authoring checklist, and registration steps. Always call audit definitions runbooks, never "skills".

Tests

Generate tests for each engine module:

• run-skill: mock the Bedrock/Anthropic client; assert the anti-loop guard fires at 3 consecutive identical calls; assert skill_done breaks the loop; assert model fallback is attempted exactly once on a first-call error.
• repair-pipeline: test applySearchReplaceBlocks (zero-match error, multi-match error, single-match success), parseSearchReplaceBlocks (one block, multiple blocks), selectWinner (fewer-than-2-valid → null, tied majority → earliest wins).
• repair-ci: test selectWinningOutcome with N=3 (threshold=2) and N=1 (threshold=1).
• dedup: assert code findings are suppressed when a matching branch/PR exists; assert manual findings are suppressed on exact-signature match only.
• finding-contract (types): assert the emit_finding schema rejects missing required fields.

Scheduler / IaC

Generate scheduler config for three schedules: daily, weekly, repair-ci. Each schedule passes { mode: "<mode>" } as the invocation payload.

EventBridge (default): three AWS::Scheduler::Schedule resources (or CDK Schedule constructs). Recommended cadences: daily 06:00 UTC, weekly Sunday 06:00 UTC, repair-ci every 30 minutes.

GitHub Actions: a .github/workflows/doctor.yml with three schedule: cron entries plus a workflow_dispatch input mode so each schedule can be triggered manually. Follow the GitHub Actions row in references/swap-table.md.

POSIX cron / systemd timer / K8s CronJob: follow the matching row in references/swap-table.md.

Next Steps

After generation, print these steps to the user:

1. Deploy. Run npm install && npm run build (or pip install -e .) in the generated doctor/ directory, then deploy using your chosen scheduler's IaC or workflow file.

2. Add secrets. Set the required environment variables or secrets:

   • GITHUB_TOKEN (or GITLAB_TOKEN) with repo read + PR write scope
   • LINEAR_TOKEN (or Jira/GitHub Issues equivalent) with issue-create scope
   • SLACK_BOT_TOKEN (or Teams webhook URL / Discord webhook URL)
   • Bedrock IAM role with bedrock:InvokeModel (or ANTHROPIC_API_KEY)
   • Data-source credentials if a query tool was selected

3. Smoke-test. Trigger the daily schedule manually and inspect the Slack digest. Confirm scan-logs runs without error (zero findings is the expected healthy outcome).

4. Write your next runbook. Use the add-doctor-runbook skill and follow references/writing-runbooks.md. Start with the skeleton in that reference, work through the authoring checklist, then register the runbook in doctor/skills/index.ts and config.ts.