cyanheads/workflows-mcp-server

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SkillsMP catalog refreshed: October 29, 2026 at 18:30

skills collected: 28

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<div align="center"> <h1>@cyanheads/workflows-mcp-server</h1> <p><b>Store, query, and create YAML workflow playbooks for LLM agents via MCP. STDIO or Streamable HTTP.</b> <div>5 Tools</div> </p> </div> <div align="center"> [![Version](https://img.shields.io/badge/Version-0.5.0-blue.svg?style=flat-square)](./CHANGELOG.md) [![License](https://img.shields.io/badge/License-Apache%202.0-orange.svg?style=flat-square)](./LICENSE) [![Docker](https://img.shields.io/badge/Docker-ghcr.io-2496ED?style=flat-square&logo=docker&logoColor=white)](https://github.com/users/cyanheads/packages/container/package/workflows-mcp-server) [![MCP SDK](https://img.shields.io/badge/MCP%20SDK-^2.4.0-green.svg?style=flat-square)](https://modelcontextprotocol.io/) [![npm](https://img.shields.io/npm/v/@cyanheads/workflows-mcp-server?style=flat-square&logo=npm&logoColor=white)](https://www.npmjs.com/package/@cyanheads/workflows-mcp-server) [![TypeScript](https://img.shields.io/badge/TypeScript-^7.0.2-3178C6.svg?style=flat-square)](https://www.typescriptlang.org/) [![Bun](https://img.shields.io/badge/Bun-v1.4.4-blueviolet.svg?style=flat-square)](https://bun.sh/) </div> <div align="center"> [![Install in Claude Desktop](https://img.shields.io/badge/Install_in-Claude_Desktop-D97757?style=for-the-badge&logo=anthropic&logoColor=white)](https://github.com/cyanheads/workflows-mcp-server/releases/latest/download/workflows-mcp-server.mcpb) [![Install in Cursor](https://cursor.com/deeplink/mcp-install-dark.svg)](https://cursor.com/en/install-mcp?name=workflows-mcp-server&config=eyJjb21tYW5kIjoibnB4IiwiYXJncyI6WyIteSIsIkBjeWFuaGVhZHMvd29ya2Zsb3dzLW1jcC1zZXJ2ZXIiXX0=) [![Install in VS Code](https://img.shields.io/badge/VS_Code-Install_Server-0098FF?style=for-the-badge&logo=visualstudiocode&logoColor=white)](https://vscode.dev/redirect?url=vscode:mcp/install?%7B%22name%22%3A%22workflows-mcp-server%22%2C%22command%22%3A%22npx%22%2C%22args%22%3A%5B%22-y%22%2C%22%40cyanheads%2Fworkflows-mcp-server%22%5D%7D) [![Framework](https://img.shields.io/badge/Built%20on-@cyanheads/mcp--ts--core-67E8F9?style=flat-square)](https://www.npmjs.com/package/@cyanheads/mcp-ts-core) </div> --- ## Overview A declarative workflow library for LLM agents, backed by local YAML files. Store, list, and retrieve named, versioned multi-step playbooks — each a sequence of MCP server/tool calls — for permanent reuse or one-shot temporary runs. Edits to the YAML files are picked up automatically. ### Tools | Tool | Description | |:-----|:------------| | `workflow_list` | List all permanent workflows in the index, with optional keyword, category, and tag filters. | | `workflow_get` | Retrieve a complete workflow definition by name, with the library's global instructions included. | | `workflow_create` | Write a new permanent workflow YAML to the library. | | `workflow_create_temp` | Write a temporary workflow draft, indexed but excluded from list results, kept until deleted. | | `workflow_delete` | Remove a permanent workflow or a temporary draft by name and optional version, after the user confirms the resolved target. | ## Capability reference ### `workflow_list` <sub>tool</sub> - Optional `query` (name and description), `category` (substring), and `tags` (all must match) filters, case-insensitive; temporary drafts are never listed - Sorted by name, then highest version first; an empty result carries a `notice` echoing the applied filters - `includeTools: true` adds each workflow's unique `server/tool` pairs --- ### `workflow_get` <sub>tool</sub> - `name` plus an optional semver `version`; omit `version` for the highest available, drafts included - Returns the full workflow, its `source` (`permanent` or `temp`), and `globalInstructions` from `global_instructions.md` (`null` when absent); fails with `not_found` or `version_not_found` - Template placeholders such as `{{input.foo}}` come back verbatim — the server never interpolates them --- ### `workflow_create` <sub>tool</sub> - `name`, semver `version`, `description`, `author`, `category`, and `steps` (plus optional `tags`); stored as one file per `name@version` under `categories/<category>/`, with created and updated dates stamped - Returns the `key` (`name@version`) and `filePath`; fails with `already_exists` when a permanent workflow or a draft holds the key, `invalid_input`, or `write_failed` --- ### `workflow_create_temp` <sub>tool</sub> - The `workflow_create` fields minus `category`; stored under `temp/`, retrievable with `workflow_get`, never listed, and kept until `workflow_delete` removes it - `status` is `created`, or `overwritten` when it replaced the draft of the same key (keeping that draft's `created_date`); a key held by a permanent workflow fails with `already_exists` --- ### `workflow_delete` <sub>tool</sub> - `name` plus an optional `version` (omitted: the highest across permanent workflows and drafts); the user confirms the resolved `name@version`, source, and file before anything is deleted, so a client without elicitation cannot delete - Returns the deleted workflow's `source`, plus a `notice` when another file declaring the same key now takes its place; fails with `cancelled`, `confirmation_invalid` (a prompt never issued, already answered, older than 10 minutes, or issued to another caller), `target_changed` (the file or its content changed after the user saw it), or `not_found` ## Features Built on [`@cyanheads/mcp-ts-core`](https://github.com/cyanheads/mcp-ts-core): stdio and Streamable HTTP transports, pluggable auth (`none` / `jwt` / `oauth`), swappable storage (`in-memory`, `filesystem`, `Supabase`, `Cloudflare KV/R2/D1`), structured logging with optional OpenTelemetry tracing. Workflow library: - YAML files under `categories/` and `temp/` are validated at index time; an invalid file is skipped and logged, never crashes the server - In-memory index keyed by `name@version`, read from each file's content rather than its name and kept fresh by a debounced recursive watcher; a permanent workflow outranks a draft with the same key - Versions are canonical semver everywhere: a leading `v`, surrounding whitespace, and build metadata are dropped, so `v1.0.0+build.5` is stored, keyed, and looked up as `1.0.0` - Creates and deletes run one at a time, so each existence check holds until its write lands; filenames carry a hash of `name@version`, so keys whose slugs coincide never share a file - An `_index.json` snapshot is written on every rebuild for external tooling and debugging Agent-friendly output: - Discriminated output — `source: "permanent" | "temp"` on every `workflow_get` response and typed `reason` codes (`not_found`, `version_not_found`, `already_exists`, `cancelled`, `confirmation_invalid`, `target_changed`, `index_unavailable`, …) on failures, so callers branch on data instead of parsing error strings - No extra round trip — `workflow_get` always returns `globalInstructions` alongside the workflow definition in the same response - Response shaping — `workflow_list`'s optional `includeTools` flag pre-derives the unique `server/tool` pairs used by a workflow, and an empty result echoes the applied filters with a broadening hint instead of returning nothing --- ## Getting started No API keys required. The server reads from a local `workflows-yaml/` directory by default. Add the following to your MCP client configuration file: ```json { "mcpServers": { "workflows-mcp-server": { "type": "stdio", "command": "bunx", "args": ["@cyanheads/workflows-mcp-server@latest"], "env": { "MCP_TRANSPORT_TYPE": "stdio", "WORKFLOWS_DIR": "/absolute/path/to/your/workflows-yaml" } } } } ``` Or with npx (no Bun required): ```json { "mcpServers": { "workflows-mcp-server": { "type": "stdio", "command": "npx", "args": ["-y", "@cyanheads/workflows-mcp-server@latest"], "env": { "MCP_TRANSPORT_TYPE": "stdio", "WORKFLOWS_DIR": "/absolute/path/to/your/workflows-yaml" } } } } ``` Or with Docker: ```json { "mcpServers": { "workflows-mcp-server": { "type": "stdio", "command": "docker", "args": [ "run", "-i", "--rm", "-e", "MCP_TRANSPORT_TYPE=stdio", "-v", "/absolute/path/to/your/workflows-yaml:/workflows-yaml", "-e", "WORKFLOWS_DIR=/workflows-yaml", "ghcr.io/cyanheads/workflows-mcp-server:latest" ] } } } ``` For Streamable HTTP, set the transport and start the server: ```sh MCP_TRANSPORT_TYPE=http MCP_HTTP_PORT=3010 bun run start:http # Server listens at http://localhost:3010/mcp ``` ### Seed workflows The repository ships a `workflows-yaml/` directory with example workflows organized under `categories/`. These are ready to use as a starting point. The `workflows-yaml/global_instructions.md` file contains instructions the server includes in every `workflow_get` response (the `globalInstructions` field) — edit it to set global guidance for your agent. ### Prerequisites - [Bun v1.4.0](https://bun.sh/) or higher (or Node.js v24+). - A local directory containing YAML workflow files (or use the bundled `workflows-yaml/` seed). ### Installation 1. **Clone the repository:** ```sh git clone https://github.com/cyanheads/workflows-mcp-server.git ``` 2. **Navigate into the directory:** ```sh cd workflows-mcp-server ``` 3. **Install dependencies:** ```sh bun install ``` 4. **Configure environment:** ```sh cp .env.example .env # edit .env if needed — most settings have defaults ``` --- ## Configuration | Variable | Description | Default | |:---------|:------------|:--------| | `WORKFLOWS_DIR` | Absolute or relative path to the workflows root directory. | `./workflows-yaml` | | `GLOBAL_INSTRUCTIONS_PATH` | Path to the global instructions markdown file. Derives from `WORKFLOWS_DIR` when not set. | `<WORKFLOWS_DIR>/global_instructions.md` | | `WATCHER_DEBOUNCE_MS` | Integer milliseconds (0–2147483647) to debounce filesystem change events before rebuilding the index. | `500` | | `MCP_TRANSPORT_TYPE` | Transport: `stdio` or `http`. | `stdio` | | `MCP_HTTP_PORT` | Port for HTTP server. | `3010` | | `MCP_SESSION_MODE` | HTTP sessions: `auto` or `stateful`. `workflow_delete`'s confirmation prompt needs a live session, so HTTP startup with `stateless` fails with a configuration error. Ignored over stdio. | `stateful`, declared in `src/index.ts` | | `MCP_AUTH_MODE` | Auth mode: `none`, `jwt`, or `oauth`. | `none` | | `MCP_REQUEST_STATE_KEY` | Seals the `requestState` a confirmation round carries (≥ 32 bytes, the same on every instance, e.g. `openssl rand -base64 32`); any state the server did not seal is rejected before the handler runs. `workflow_delete`'s round carries its confirmation id, so set it for HTTP deployments. | unset | | `MCP_LOG_LEVEL` | Log level (RFC 5424). | `info` | | `LOG_TOOL_FAILURE_PAYLOADS` | Log each failed tool call's arguments and result, redacted by key name and capped at `LOG_TOOL_FAILURE_PAYLOAD_MAX_BYTES` (default `16384`). A secret inside a free-form value is not redacted. | `false` | | `OTEL_ENABLED` | Enable [OpenTelemetry instrumentation](https://github.com/cyanheads/mcp-ts-core/tree/main/docs/telemetry) (spans, metrics, completion logs). | `false` | See [`.env.example`](./.env.example) for the full list of optional overrides. --- ## Running the server ### Local development - **Build and run:** ```sh # One-time build bun run rebuild # Run the built server bun run start:stdio # or bun run start:http ``` - **Run checks and tests:** ```sh bun run devcheck # Lint, format, typecheck, security bun run test # Vitest test suite bun run lint:mcp # Validate MCP definitions against spec ``` ### Docker ```sh docker build -t workflows-mcp-server . docker run --rm \ -v /path/to/workflows-yaml:/workflows-yaml \ -e WORKFLOWS_DIR=/workflows-yaml \ -p 3010:3010 \ workflows-mcp-server ``` The Dockerfile defaults to HTTP transport, stateful session mode (required — see `MCP_SESSION_MODE` above), and logs to `/var/log/workflows-mcp-server`. OpenTelemetry peer dependencies are installed by default — build with `--build-arg OTEL_ENABLED=false` to omit them. --- ## Project structure | Directory | Purpose | |:----------|:--------| | `src/index.ts` | `createApp()` entry point — registers tools and inits the workflow index service. | | `src/config/` | Server-specific environment variable parsing and validation with Zod. | | `src/mcp-server/tools/` | Tool definitions (`*.tool.ts`). | | `src/services/workflow-index/` | `WorkflowIndexService` — YAML parsing, index build, watcher, semver lookup, write helpers. | | `tests/` | Unit and integration tests mirroring `src/`. | | `workflows-yaml/` | Seed workflow library — `categories/` for permanent workflows, `temp/` for temporary drafts, `global_instructions.md` for agent-global guidance. | --- ## Development guide See [`CLAUDE.md`](./CLAUDE.md) for development guidelines and architectural rules. The short version: - Handlers throw, framework catches — no `try/catch` in tool logic - Use `ctx.log` for request-scoped logging - Register new tools via the barrel in `src/mcp-server/tools/definitions/index.ts` - Filesystem operations go through `WorkflowIndexService`, not directly in tool handlers --- ## Contributing Issues are welcome. Run checks and tests before submitting: ```sh bun run devcheck bun run test ``` --- ## License Apache-2.0 — see [LICENSE](LICENSE) for details.

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Catalog of reusable response- and data-shaping techniques for MCP servers built on `@cyanheads/mcp-ts-core` — overflow handling, payload shaping, retrieval patterns. Use when a tool's payload is too large, awkwardly shaped, or expensive to retrieve and you…

2026-09-13

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