Token efficiency: tools for developers

Tools that reduce token costs, compress context or cache LLM requests. An entry can appear under several use cases when its topics or description provide several explicit signals.

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101 entries in this view.

Tool ranking

Ranked by creation date, newest first; undated entries come last. Raw values keep their source-specific window, shown under each tool; a change requires at least two snapshots from the last 7 days.

  1. 1

    Skill
    Active

    The Agent Knowledge Kit & Architecture System — 10–32x token-efficient architecture discovery for AI coding agents

    TypeScript
    • agentic-ai
    • ai-agents
    • antigravity
    • bun
    • claude-code

    githubestimated momentumOpen source ↗

    Install git clone https://github.com/chama-x/quiv ~/.claude/skills/quiv

    3GitHub stars—
  2. 2

    MCP
    Active

    Context optimization for LLM agents: tool registry, result masking, budgeting, compaction.

    RustLicense: NOASSERTION

      mcpmeasured growthOpen source ↗

      Install claude mcp add distil -- npx @munhq/distil

      1GitHub starsstable
    • 3

      Skill
      Active

      A Claude Code hook that routes each Read on a PDF to the path that actually works: text layer to UTF-8 text, scans to vision, and neither one through poppler.

      PythonLicense: MIT
      • claude-code
      • claude-code-hooks
      • claude-code-plugin
      • pdf
      • poppler

      githubmeasured growthOpen source ↗

      Install /plugin marketplace add WatsonTsai/pdf-text-router

      7GitHub starsstable
    • 4

      Skill
      Active

      Profile Claude Code context, discover repeated workflows, and regression-test your skills. Local-only, zero-dependency.

      PythonLicense: MIT
      • agent-skills
      • anthropic
      • claude-code
      • claude-code-plugin
      • claude-code-plugins

      githubmeasured growthOpen source ↗

      Install /plugin marketplace add nks0614/harnessay

      5GitHub stars+2 (+66.7 %)
    • 5

      Skill
      Active

      Cut Claude Code token costs by delegating bulk LLM work to cheap models. 600+ models via NanoGPT, OpenRouter, Groq or local Ollama — batched, resumable, with real per-call cost tracking.

      PythonLicense: MIT
      • ai-agents
      • batch-processing
      • cheap-llm
      • claude-code
      • claude-code-agents

      githubmeasured growthOpen source ↗

      Install /plugin marketplace add bicced/sidequest

      1GitHub starsstable
    • 6

      Agent
      Active

      Experimental no-install semantic language for AI agents: typed action/state, safe NL/JSON fallback, and falsifiable public evals. Try the one-file probe.

      PythonLicense: Apache-2.0
      • a2a
      • agent-communication
      • agent-protocol
      • agentic-ai
      • ai-agents

      githubestimated momentumOpen source ↗

      1GitHub stars—
    • 7

      MCP
      Active

      Lossless context compression: 2-8x fewer tokens, byte-exact recovery, search inside payloads

      PythonLicense: MIT

        mcpmeasured growthOpen source ↗

        Install claude mcp add densely -- uvx densely

        6GitHub starsstable
      • 8

        Skill
        Active

        Claude Code skill: caveman-style token efficiency, spoken with a real Spanish regional accent

        JavaScriptLicense: MIT
        • agent-skills
        • ai-agents
        • anthropic
        • claude-code
        • claude-code-plugin

        githubmeasured growthOpen source ↗

        Install /plugin marketplace add Mun1to/SpanishCaveMan

        2GitHub starsstable
      • 9

        Skill
        Active

        A skill that shrink noisy log/output 60-90% before read — filter, group, dedupe, truncate. Cut token, cut cost, keep signal. By Dhayalan (aka Joy).

        PythonLicense: MIT
        • claude
        • claude-ai
        • claude-code
        • claude-code-plugin
        • claude-code-skill

        githubmeasured growthOpen source ↗

        Install /plugin marketplace add Da-ya7/PromptCompressor-skill

        1GitHub starsstable
      • 10

        Skill
        Active

        Installable agentic skills (SKILL.md) for Claude Code, Cursor, Codex, Gemini & Antigravity — 292+ product, efficiency, and common-sense skills. npx major-ai-skills

        HTMLLicense: MIT
        • agent-skills
        • agentic-skills
        • ai-agent-skills
        • ai-agents
        • ai-coding

        githubestimated momentumOpen source ↗

        Install git clone https://github.com/alivirgo/Major-AI-Skills ~/.claude/skills/Major-AI-Skills

        1GitHub stars—
      • 11

        CLI
        Active

        Measure and shrink the token cost of Claude Code skills, tier by tier: the always-on system-prompt tax, the per-invocation body, and on-demand references, each priced at the rate it is actually billed.

        PythonLicense: MIT
        • claude
        • claude-code
        • claude-code-skills
        • cli
        • cost-optimization

        githubmeasured growthOpen source ↗

        1GitHub starsstable
      • 12

        MCP
        Active

        Reversible context compression for AI agents: cut token usage up to 94%, originals retrievable

        ↓ 13 downloads/weekPythonLicense: Apache-2.0

          mcpmeasured growthOpen source ↗

          Install claude mcp add token_optimizer -- uvx slimctx

          1GitHub starsstable
        • 13

          MCP
          Active

          Statically audits MCP tool surfaces for token cost, schema quality, and design issues.

          TypeScript

            mcpmeasured growthOpen source ↗

            Remote server, to be declared in the MCP configuration https://mcplint-web.vercel.app/api/mcp

            0GitHub starsstable
          • 14

            MCP
            Active

            Verifies token/cost savings claimed by AI context-reduction proxies via MCP tools.

            TypeScriptLicense: Apache-2.0

              mcpmeasured growthOpen source ↗

              Install claude mcp add tokentrust -- uvx tokentrust-cli

              0GitHub starsstable
            • 15

              MCP
              Active

              Token cost math for LLM API calls: verified per-1M-token rates for 69 models, 17 providers.

              ↓ 27 downloads/weekJavaScriptLicense: MIT

                mcpmeasured growthOpen source ↗

                Install claude mcp add comparedge-llm-cost -- npx @comparedge/llm-cost-mcp

                2GitHub starsstable
              • 16

                Skill
                Active

                Claude Code plugin: Fable 5 as a token-frugal orchestrator with tiered Opus/Sonnet/Haiku agents

                HTMLLicense: MIT
                • anthropic
                • claude-code
                • claude-code-plugin
                • fable
                • hooks

                githubmeasured growthOpen source ↗

                Install /plugin marketplace add realgarit/fable-baton

                22GitHub stars+1 (+4.8 %)
              • 17

                Skill
                Active

                🪒 YAGNI enforcement at the harness level, nudges toward the simplest solution and gates against unnecessary dependencies, file sprawl, and unchecked build growth.

                JavaScriptLicense: MIT
                • ai
                • anthropic
                • claude
                • claude-code
                • claude-code-plugin

                githubmeasured growthOpen source ↗

                Install /plugin marketplace add V-Songbird/razor

                8GitHub stars+1 (+14.3 %)
              • 18

                Skill
                Active

                🤫 Token-lean sessions at the harness level. An easy to grasp output style, output-shrinking hooks, and log compression cut both input and output tokens.

                JavaScriptLicense: MIT
                • agent-skills
                • ai
                • anthropic
                • claude
                • claude-code

                githubmeasured growthOpen source ↗

                Install /plugin marketplace add V-Songbird/hush

                47GitHub stars+5 (+11.9 %)
              • 19

                Skill
                Active

                Lossless context compression plugin for Claude Code & OpenCode.

                TypeScriptLicense: BSD-3-Clause
                • anthropic
                • chatgpt
                • claude
                • claude-code
                • claude-code-plugin

                githubmeasured growthOpen source ↗

                Install /plugin marketplace add aerovato/magic-compact

                146GitHub stars+2 (+1.4 %)
              • 20

                Agent
                Active

                Control plane for AI coding agents: route tasks, reduce token spend, run multi-agent workflows, fallback executors, and track cost per task.

                PythonLicense: Apache-2.0
                • a2a
                • ag-ui
                • agentic-ai
                • ai-agents
                • ai-coding

                githubmeasured growthOpen source ↗

                16GitHub starsstable
              • 21

                Skill
                Active

                Eco mode for Claude Code. /eco: -31% to -73% output tokens with critical findings intact; /eco-max: up to -75% with lowered effort. Measured hardest on Claude Fable 5 (fable5), deep-studied on Sonnet 5, works on Opus 4.8 too. We publish our…

                JavaScriptLicense: MIT
                • ai-agents
                • anthropic
                • claude
                • claude-ai
                • claude-code

                githubmeasured growthOpen source ↗

                Install /plugin marketplace add sup3x/claude-code-eco

                33GitHub starsstable
              • 22

                Skill
                Active

                Tech-lead orchestration for Claude Code — the top-tier model (Fable) keeps architecture & decisions, cheap subagents (Sonnet/Opus) do the routine and the digging. Save tokens without losing quality.

                License: MIT
                • agent-skills
                • ai-agents
                • anthropic
                • claude
                • claude-code

                githubmeasured growthOpen source ↗

                Install /plugin marketplace add AndyShaman/senior-fable

                23GitHub starsstable
              • 23

                MCP
                Active

                Pay-per-call agent APIs over x402: web scraping, token compression, and semantic cache.

                JavaScriptLicense: MIT

                  mcpmeasured growthOpen source ↗

                  Install claude mcp add gate402-mcp -- npx gate402-mcp

                  2GitHub stars+1 (+100.0 %)

                Learning resources

                Ranked by creation date, newest first; undated entries come last. These resources remain available separately and do not take part in the main tool ranking.

                1. 1

                  mcp-agent-skills-hub

                  MCP
                  ActiveOpen source ↗

                  Molavi Agent Skills: Curated AI agent skills and MCP configs for Antigravity, Cursor, Codex & Claude — by Taghi Molavi

                  JavaScriptLicense: MIT
                  • agentic-workflows
                  • ai-agents
                  • ai-skills
                  • antigravity
                  • awesome-list
                  githubResourcemeasured growth
                  8GitHub starsstable
                2. 2

                  outsourcerer

                  Skill
                  ActiveOpen source ↗

                  Make the most out of your subscriptions. Delegate work to other harnesses and models, while keeping your main session the orchestrator. Nothing new to learn. Keep working like you do, but better.

                  Shell
                  • agent-skills
                  • agentic-workflow
                  • claude-code
                  • codex
                  • fable
                  github

                  Install git clone https://github.com/alexgreensh/outsourcerer ~/.claude/skills/outsourcerer

                  Resourcemeasured growth
                  142GitHub stars+4 (+2.9 %)