Ephemeral Buffer

k-rister4stars

Ephemeral in-memory command output capture and hybrid search MCP server for coding agents.

1# Ephemeral Buffer

README.mdMCP server

Transport: stdio
Status: Local

Power your agent

Add this server

Install from the publisher. Not a PlugMCP endpoint.

Run on PlugMCP

Host a copy with our keys and logs.

No packaged release in the registry yet. Follow the repository README.

RepositoryPublisher installStep-by-step: add this in Claude

Remote URL or a command on your machine? How the two installs differ

Run on PlugMCP

Host a copy with our keys and logs.

A new server you create. It is not this listing's official endpoint. Use the publisher install when you want their URL and their credentials.

Launch

Server facts

Local

Transport: stdio
License: Apache-2.0
Last checked: 2026-10-28

Stars: 4
Tools: —
Uptime: —

Tools

No tool list yet. Remote servers get one after the first health check.

FAQ

Questions

How do I install Ephemeral Buffer?

Copy the stdio config for Cursor, Claude Desktop, Claude Code, or VS Code on this page. It uses the publisher's install, not a PlugMCP proxy.

Does Ephemeral Buffer need an API key?

No required environment variable is listed on this record.

What transport does Ephemeral Buffer use?

Ephemeral Buffer runs locally over stdio.

When was Ephemeral Buffer last checked?

Last checked 2026-10-28. Ephemeral in-memory command output capture and hybrid search MCP server for coding agents.

From the publisher

Documentation

Ephemeral Buffer MCP Server (`ephemeral-buffer`)

Ephemeral Buffer is an MCP server and command-line client for capturing command output in a bounded, searchable buffer. Coding agents can search captures and retrieve relevant portions instead of carrying entire build and test logs in their conversation context.

Quick start

Requires Python 3.10 or newer. Install the package in an isolated environment.

macOS and Linux

python3 -m venv .venv
.venv/bin/python -m pip install --upgrade pip
.venv/bin/python -m pip install ephemeral-buffer-mcp

The default distribution includes BM25, semantic, and hybrid search. To explicitly choose the smaller lexical-only install, use ephemeral-buffer-mcp-lexical; it supports BM25 while semantic and hybrid search require the full distribution.

Configure your MCP client using the user guide. For an isolated server, the server and ephbuf must use the same unique session ID. On macOS/Linux, export the ID before starting Codex with the launcher installed in the virtual environment:

export EPHEMERAL_SESSION_ID=quick-start-session
.venv/bin/codex-ephemeral

Set the same value in another MCP client's server environment. Then capture command output with ephbuf, passing the same ID.

macOS and Linux

.venv/bin/python -c 'print("Hello from a captured command")' 2>&1 |
  EPHEMERAL_SESSION_ID=quick-start-session .venv/bin/ephbuf --label "quick start"

Windows installation steps are in the user guide's Windows support section. Windows runtime behavior isn't covered by CI; that section describes the unverified CLI capture and process-control paths.

The agent can then search the capture and retrieve bounded slices through the MCP tools.

Context reduction in one agent comparison

In a five-repetition gpt-6-luna comparison run on 2026-10-09, mean MCP tool-response bytes fell from 6,681 to 1,501 (77.5%); the Codex context proxy fell from 23,910 to 17,643 bytes (26.2%). This is a result from one workload, not a general savings guarantee. The context figure is a prompt/event-envelope proxy, not the model's internal context size. See the benchmark methodology and comparison details.

Documentation

Topic	Document
Installation, client setup, and privacy	User guide
MCP tools and advanced workflows	Tool reference
Data flow	Architecture
Benchmark commands, metrics, and comparisons	Benchmarks
Runtime configuration and operations	Operations guide
Development setup and contribution workflow	Contributing
Release history	Changelog

Ephemeral Buffer

k-rister4stars

Ephemeral in-memory command output capture and hybrid search MCP server for coding agents.

Knowledge Memory

Install Run on PlugMCP

GitHub Website

Run on PlugMCP

1# Ephemeral Buffer

README.mdMCP server

Transport: stdio
Status: Local

Power your agent

Add this server

Install from the publisher. Not a PlugMCP endpoint.

Run on PlugMCP

Host a copy with our keys and logs.

No packaged release in the registry yet. Follow the repository README.

RepositoryPublisher installStep-by-step: add this in Claude

Remote URL or a command on your machine? How the two installs differ

Run on PlugMCP

Host a copy with our keys and logs.

A new server you create. It is not this listing's official endpoint. Use the publisher install when you want their URL and their credentials.

Launch

Server facts

Local

Transport: stdio
License: Apache-2.0
Last checked: 2026-10-28

Stars: 4
Tools: —
Uptime: —

Tools

No tool list yet. Remote servers get one after the first health check.

FAQ

Questions

How do I install Ephemeral Buffer?

Copy the stdio config for Cursor, Claude Desktop, Claude Code, or VS Code on this page. It uses the publisher's install, not a PlugMCP proxy.

Does Ephemeral Buffer need an API key?

No required environment variable is listed on this record.

What transport does Ephemeral Buffer use?

Ephemeral Buffer runs locally over stdio.

When was Ephemeral Buffer last checked?

Last checked 2026-10-28. Ephemeral in-memory command output capture and hybrid search MCP server for coding agents.

From the publisher

Documentation

Ephemeral Buffer MCP Server (`ephemeral-buffer`)

Quick start

Requires Python 3.10 or newer. Install the package in an isolated environment.

macOS and Linux

python3 -m venv .venv
.venv/bin/python -m pip install --upgrade pip
.venv/bin/python -m pip install ephemeral-buffer-mcp

export EPHEMERAL_SESSION_ID=quick-start-session
.venv/bin/codex-ephemeral

Set the same value in another MCP client's server environment. Then capture command output with ephbuf, passing the same ID.

macOS and Linux

.venv/bin/python -c 'print("Hello from a captured command")' 2>&1 |
  EPHEMERAL_SESSION_ID=quick-start-session .venv/bin/ephbuf --label "quick start"

Windows installation steps are in the user guide's Windows support section. Windows runtime behavior isn't covered by CI; that section describes the unverified CLI capture and process-control paths.

The agent can then search the capture and retrieve bounded slices through the MCP tools.

Context reduction in one agent comparison

Documentation

Topic	Document
Installation, client setup, and privacy	User guide
MCP tools and advanced workflows	Tool reference
Data flow	Architecture
Benchmark commands, metrics, and comparisons	Benchmarks
Runtime configuration and operations	Operations guide
Development setup and contribution workflow	Contributing
Release history	Changelog

Add this server

Host a copy with our keys and logs.

Server facts

Tools

Questions

How do I install Ephemeral Buffer?

Does Ephemeral Buffer need an API key?

What transport does Ephemeral Buffer use?

When was Ephemeral Buffer last checked?

Documentation

Ephemeral Buffer MCP Server (ephemeral-buffer)

Quick start

Context reduction in one agent comparison

Documentation

Add this server

Host a copy with our keys and logs.

Server facts

Tools

Questions

How do I install Ephemeral Buffer?

Does Ephemeral Buffer need an API key?

What transport does Ephemeral Buffer use?

When was Ephemeral Buffer last checked?

Documentation

Ephemeral Buffer MCP Server (ephemeral-buffer)

Quick start

Context reduction in one agent comparison

Documentation

Ephemeral Buffer MCP Server (`ephemeral-buffer`)

Ephemeral Buffer MCP Server (`ephemeral-buffer`)