Fable vs Mcacp
A side-by-side look at the Fable and Mcacp MCP servers: transport, auth, tools, quality signals, and the config to install either one in Claude, Cursor, Windsurf or VS Code.
Verdict: choose Fable for coding agents work over a hosted endpoint; choose Mcacp for coding agents as a local process. You can also run both side by side in one mcpServers block.
Which MCP server should you choose?
Choose Fable when
- You need dedicated capabilities in the Coding Agents domain.
- You prefer a remote HTTP/SSE transport.
- You want tools like
plan, critique, ask.
Choose Mcacp when
- You need dedicated capabilities in the Coding Agents domain.
- You prefer a local stdio subprocess transport.
- You want tools like
list_installed_agents, registry_search, agent_install.
Feature & specification comparison
Rows where the two servers differ are marked.
| Spec | ||
|---|---|---|
| Category | Coding Agents | Coding Agents |
| Quality signal | 52/100 · Good | 52/100 · Good |
| Install command | Confirmed | Confirmed |
| Transport | Remote HTTP/SSE | Local subprocess (stdio) |
| Auth | Not declared | Not declared |
| Pricing | Not declared | Not declared |
| Required env vars | None listed | None listed |
| Verified owner | Community listing | Community listing |
| GitHub stars | 0 | 11 |
| Directory activity | 0 views 0 installs 0 upvotes | 0 views 0 installs 0 upvotes |
| Tools | 13 | 23 |
| Full listing | View Fable | View Mcacp |
Tools & capabilities
Fable tools 13
planFlagship.** Turn a goal (+ optional context) into an executor-ready implementation plan: numbered steps, exact paths/signatures, edge cases, acceptance criteria, out-of-scope notes — written to be handed to a cheaper model and executed verbatim.critiqueCoverage-first review of code, a diff, or a design. Reports every finding with severity + confidence for downstream filtering. Optional `focus`.askRaw one-shot query to Fable. Multi-turn history, system prompt, effort, optional reasoning summary.goalWhat to build or fixcontextRelevant code, file tree, constraints, error output, prior attemptseffortlow`/`medium`/`high`/`xhigh`/`max` (default `high`)max_tokensMax tokens to generate (server default otherwise)contentCode, diff, or design to reviewfocusArea to weight, e.g. `security`, `concurrencypromptThe user messagesystem_promptSystem promptmessagesHistory as a JSON array of `{role, content}` (roles `user`/`assistant` only)- +1 more on the listing page
Mcacp tools 23
list_installed_agentsList locally installed agentsregistry_searchSearch the ACP agent registryagent_installInstall an agent from the registryagent_uninstallRemove an installed agentagent_check_upgradesCheck for available upgradesdiscover_agentsScan editor configs (Zed, JetBrains) for agentsreload_configReload `mcacp.json` from diskinitializeSpawn an agent process and perform the ACP handshakeshutdownGracefully shut down an agentnew_sessionCreate a session with working directory and permission policyload_sessionResume a persisted sessionlist_sessionsList stored sessions for an agent- +11 more on the listing page
Ready-to-paste client configs
Paste either block (or both) into your client config, e.g. claude_desktop_config.json or ~/.cursor/mcp.json. We only show a config when the install command is confirmed.
Fable
{
"mcpServers": {
"fable": {
"url": "https://api.anthropic.com/v1"
}
}
}
Mcacp
{
"mcpServers": {
"mcacp": {
"command": "npx",
"args": [
"-y",
"mcacp"
]
}
}
}
Frequently asked questions
Fable is categorized under Coding Agents and uses a remote HTTP/SSE transport. Mcacp belongs to Coding Agents and uses a local stdio subprocess. Pick Fable for coding agents work and Mcacp for coding agents.
Copy the mcpServers block from the config section on this page into your client's config (for example claude_desktop_config.json or ~/.cursor/mcp.json), then fully restart the client.
Fable has no declared pricing — check the project's own site. Mcacp has no declared pricing — check the project's own site. If a server needs environment variables such as API keys, define them under the env key in your client's MCP config.
Yes. MCP clients support multiple servers: add fable and mcacp as separate keys in the same mcpServers object, and your assistant will call tools from either one.
On AllMCPs, Fable has a quality signal of 52/100 (Good) with 0 views, 0 installs and 0 GitHub stars. Mcacp has 52/100 (Good) with 0 views, 0 installs and 11 GitHub stars.