The request names direnv, so direnv comes first: it is a shell extension that loads and unloads environment variables per directory by checking for a .envrc file before each prompt 1. Its page does not show a documented MCP server, API, or CLI door of its own, and none of the other candidates provide a direnv operation, so the alternatives below only cover related environment-variable management.

1. 1

   direnvdirenv.netwebsite read, tools not yet checked

   Shell extension that loads a directory's .envrc (and optionally .env) file into the current shell, making project-specific environment variables available when you enter the directory 1.

   WebsiteDocs

   +2 community tools built for it

2. 2

   Vercelvercel.comverified and signed

   Vercel's project API lets you create, filter and edit project environment variables, a related way to manage per-project environment settings 5.

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   official:MCP server · com.vercel/vercel-mcpAPI · Vercel APISDK · @vercel/blob+81 community tools built for it

   for agents: createProjectEnv · filterProjectEnvs · editProjectEnv

3. 3

   Dockerdocker.comverified and signed

   Docker Sandboxes can be defined declaratively through an sbxenv.yaml file that sets up the environment for agent sessions, a related approach to per-project environment configuration 4.

   WebsiteDocsPricingGet started

   official:MCP server · @aws/run-mcp-servers-with-aws-lambdaSDK · dockerlibrary · aws-smithy-observabilityCLI · dockerrepository · automated-security-helper+190 community tools built for it

   for agents: docker-sandboxes-env · list_environments · get_environment