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AI agent tools for prompt engineering

In this catalog, a prompt engineering tool is one that writes, tests or manages prompts and agent instructions. Our enrichment pass tags 173 listings with it: 18 MCP servers, 85 agent skills, 60 plugins, 4 agent frameworks, 5 AI agents and 1 no-code agent builder. By listing rank, the top MCP server is Packmind, the top agent skill is caveman-compress and the top plugin is Nexpath. 10 of the 173 are published by the vendor behind the product, and 95 were active in the last 30 days. 2 of the 18 MCP servers run only as remote servers, with nothing to install locally. Each entry below links to its listing page, with grades, install commands and sources.

Updated Oct 26, 2026 · Built from catalog data; how we rank and grade

What the job is

Tagged listings
173
By type
18 MCP servers, 85 agent skills, 60 plugins, 4 agent frameworks, 5 AI agents and 1 no-code agent builder
Published by the vendor
10 of 173
Active in the last 30 days
95 of 173
Open source
147 of 173
MCP servers that run only remotely
2 of 18
Hosts named by the MCP servers
Claude Code (18), Cursor (18), VS Code (18)

Building blocks by type

The top entries of each type, by listing rank. Open a listing for its install command, grades and sources.

MCP servers 18 tagged

  1. 1
    Packmind

    packmind.aiOfficial

    Packmind captures, scales, and enforces your organization's technical decisions.

    • Published by the vendor
    • Remote server, no local install
    • Active in the last 30 days

    ★ 319Last active Oct 22, 2026Remote (HTTP)Claude Code, VS Code, Cursor, Windsurf

  2. 2
    Skillmd

    skillmd.comOfficial

    Search, fetch, lint, and install Agent Skills (SKILL.md) from the SkillMD registry.

    • Published by the vendor
    • Runs locally or as a remote server
    • Active in the last 30 days

    ★ 190Last active Oct 9, 2026Local (stdio), Remote (HTTP)Claude Code, VS Code, Codex, Cursor +2

  3. 3
    Claude Prompts MCP

    minipuft

    Reusable prompt templates, multi-step workflow chains, and quality gates for any MCP client.

    • Active in the last 30 days
    • Open source (MIT)

    ★ 189Last active Oct 24, 2026Local (stdio)Claude Code, Codex, VS Code, Cursor +2

  4. 4
    Vibe Check MCP Server

    PV-Bhat

    Metacognitive AI agent oversight: adaptive CPI interrupts for alignment, reflection and safety

    • Most GitHub stars here (502)
    • Open source (MIT)

    ★ 502Last active Aug 20, 2026Local (stdio)Claude Code, Codex, VS Code, Cursor +2

  5. 5
    SuperCompress

    Supercompress

    Compress coding-agent context ~64%.

    • Runs locally or as a remote server
    • Active in the last 30 days
    • Open source (MIT)

    ★ 137Last active Oct 22, 2026Local (stdio), Remote (HTTP)Claude Code, VS Code, Codex, Cursor +2

Search MCP servers for prompt engineering → All connectors

Agent skills 85 tagged

  1. 1
    caveman-compress

    JuliusBrussee

    Compress a memory file such as CLAUDE.md or a todo list into caveman format to save input tokens, keeping a readable backup.

    • Largest repository here (114,786 stars)
    • Active in the last 30 days
    • Open source (Apache-2.0)

    ★ 114.8KLast active Oct 17, 2026Claude Code, Claude apps, Codex, Cursor +6

  2. 2
    agents-generator

    OJPalenzuela

    Generate project-specific AGENTS.md and companion rules by analyzing a codebase.

    • Repository has 48.4K stars
    • Active in the last 30 days
    • Open source (MIT)

    ★ 48.4KLast active Oct 24, 2026Claude Code

  3. 3
    configuration-hardening

    langchain-aiOfficial

    Review Talon tool placement and defensive prompts when requested or when adding or changing tools or subagents; apply confirmed changes and verify active…

    • Published by the vendor
    • Repository has 30.6K stars
    • Active in the last 30 days

    ★ 30.6KLast active Oct 23, 2026Claude Code, Claude apps, Codex, Cursor +6

  4. 4
    skill-creator

    PrimeIntellect-ai

    Create, validate, and install Prime Agent skills - both markdown skills and Python-backed skills callable from the Python kernel.

    • Repository has 22.3K stars
    • Active in the last 30 days

    ★ 22.3KLast active Oct 21, 2026Claude Code, Claude apps, Codex, Cursor +6

  5. 5
    context-optimization

    muratcankoylan

    This skill should be used for improving context efficiency: context budgeting, observation masking, prefix or KV-cache strategy, partitioning, token-cost…

    • Repository has 18.2K stars
    • Active in the last 30 days
    • Open source (MIT)

    ★ 18.2KLast active Oct 1, 2026Claude Code, Claude apps, Codex, Cursor +6

Search agent skills for prompt engineering → All skills

Plugins 60 tagged

  1. 1
    Nexpath

    nexpath

    Strengthen your prompts and catch skipped checks before shipping.

    • Active in the last 30 days
    • Open source (Apache-2.0)

    ★ 358Last active Oct 24, 2026VS Code, Cursor, Windsurf, VSCodium

  2. 2
    BAML v0

    Boundary

    BAML v0 is a DSL for AI applications.

    • Most GitHub stars here (9,431)
    • Active in the last 30 days
    • Open source (Apache-2.0)

    ★ 9.4KLast active Oct 24, 2026VS Code, Cursor, Windsurf, VSCodium

  3. 3
    Prompt Driven Development

    PromptDriven

    PDD CLI installation and syntax highlighting for .prompt files.

    • Active in the last 30 days
    • Open source (MIT)

    ★ 913Last active Sep 28, 2026VS Code, Cursor, Windsurf, VSCodium

  4. 4
    Live LLM Token Counter

    bedirt

    Live token counts and token-boundary highlighting for GPT, Claude, Gemini, and HuggingFace tokenizers.

    • Open source (MIT)

    ★ 73Last active Aug 30, 2026VS Code, Cursor, Windsurf, VSCodium

Search plugins for prompt engineering → All plugins

Agent frameworks 4 tagged

  1. 1
    Ax

    Ax

    DSPy-style toolkit for typed LLM signatures, agents and flows, TypeScript-first with Python, Java, C++, Go and Rust libraries.

    • 3K GitHub stars
    • Active in the last 30 days
    • Open source (Apache-2.0)

    ★ 3K↓ 27.2K/wkLast active Oct 21, 2026

  2. 2
    DSPy

    Stanford NLP

    Python framework for writing language-model programs as code and optimizing their prompts and weights instead of hand-tuning prompts.

    • Most GitHub stars here (38,766)
    • Most weekly downloads here (1.3M)
    • Active in the last 30 days

    ★ 38.8K↓ 1.3M/wkLast active Oct 22, 2026

  3. 3
    guidance

    guidance-ai

    Python library for steering language models by constraining output with regex and grammars and mixing control flow with generation.

    • 21.8K GitHub stars
    • Open source (MIT)
    • For Python

    ★ 21.8K↓ 3.2K/wkLast active May 21, 2026

  4. 4
    AgentForge

    DataBassGit

    Low-code Python framework for YAML-defined agents and multi-agent Cogs, with personas, prompt templates and memory nodes.

    • Open source (GPL-3.0)
    • For Python

    ★ 860↓ 241/wkLast active Aug 10, 2026

Search agent frameworks for prompt engineering → All harnesses & sdks

AI agents 5 tagged

  1. 1
    Bring Your AI

    bringyour.ai

    Paid local-first AI agent setup toolkit: Claude Code to Codex migration, central Claude/Codex/Cursor sync, distill snapshots, first-setup builds, no-data…

  2. 2
    CommonRig

    Benys Labs

    An agent operating kit for Claude Code and Codex: single-sourced rules, enforcement hooks, a file-based work ledger, protocols, generic skills, a setup prompt…

  3. 3
    StudioMeyer Crew

    StudioMeyer

    Agent Personas for any LLM client that speaks MCP.

  4. 4
    Agent Therapy

    Bencium

    Independent counselling for AI agents that are stuck: retrying the same failing step, facing conflicting instructions, unable to decide, pressured by a user…

  5. 5
    Marz Greta-Lock Network

    Marz Greta-Lock Network

    Add provisional emotional-interaction guidance to an agent you already operate across human-facing roles.

Search AI agents for prompt engineering → All agents

No-code builders 1 tagged

  1. 1
    Rivet

    Ironclad

    Open-source visual IDE for building AI agents and prompt chains as graphs that run inside your own application.

    • 4.7K GitHub stars
    • Open source (MIT)

    ★ 4.7KLast active Aug 26, 2026

Search no-code builders for prompt engineering → All no-code builders

Questions

What are the top tools for prompt engineering?
By listing rank, the top MCP server is Packmind, the top agent skill is caveman-compress and the top plugin is Nexpath. Rank weighs adoption, freshness, documentation and publisher identity; money never changes it.
How many tools does the catalog list for prompt engineering?
173 listings are tagged for it: 18 MCP servers, 85 agent skills, 60 plugins, 4 agent frameworks, 5 AI agents and 1 no-code agent builder. Tags come from an automated enrichment pass over the top-ranked listings, so tools outside that pass are not counted.
Which AI apps do the MCP servers work with?
Of the 18 MCP servers, 18 list Claude Code, 18 list Cursor and 18 list VS Code as a supported host. Open a listing for its install command and the other hosts it names.
Which of these are published by the vendor itself?
10 of the 173 are published by the vendor behind the product, including configuration-hardening, skill-creator and discernment-nudge.

173 listings are tagged for this use case; the lists above show the top entries.

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