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claw-tsaver

by Yang1Bai
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claw-tsaver

Un proxy MCP de ahorro de tokens para usuarios de OpenClaw. Reduce las cargas útiles de llamadas a herramientas en más de un 90% mediante expansión diferida.

Por qué

Las llamadas a herramientas MCP a menudo devuelven miles de tokens de HTML o JSON en una sola respuesta, pero el modelo normalmente utiliza solo el 5% de ellos. El 95% restante consume silenciosamente la ventana de contexto y aumenta el costo. claw-tsaver se sitúa entre OpenClaw y tus servidores MCP descendentes, intercepta las respuestas de gran tamaño y entrega al modelo una vista previa compacta + un manejador bajo demanda.

Related MCP server: TokenSaver MCP

Cómo

sequenceDiagram
    participant U as OpenClaw (Claude)
    participant C as claw-tsaver proxy
    participant F as fetch / puppeteer / etc.
    U->>C: call_tool("fetch", url)
    C->>F: forward call
    F-->>C: 11,507 tokens of HTML
    Note over C: tiktoken count > threshold
    C->>C: store full content in SQLite
    C-->>U: {preview_head, preview_tail, expand_handle}<br/>(only 104 tokens)
    Note over U: model decides if it needs full text
    U->>C: expand_content(handle)
    C-->>U: full 11,507 tokens

Medición real

Prueba

Tokens originales

Tokens devueltos

Ahorro

fetch Wikipedia "Tokenization (data security)"

11,507

104

99.1%

Probado en OpenClaw + Claude Sonnet 4.6 + mcp-server-fetch, 25-04-2026.
Datos brutos: benchmarks/mvp-day1-fetch.jsonl.

Inicio rápido

1. Requisitos previos

Instala uv (configuración única):

curl -LsSf https://astral.sh/uv/install.sh | sh

No se necesita instalación de claw-tsaver: uvx lo buscará y ejecutará bajo demanda.

2. Configurar servidores MCP descendentes

Edita ~/.claw-tsaver/config.json (la primera ejecución de claw-tsaver-mcp creará automáticamente una plantilla):

{
  "downstream_servers": [
    {"name": "fetch", "command": "uvx", "args": ["mcp-server-fetch"]}
  ],
  "compression_threshold_tokens": 500
}

3. Registrar con OpenClaw

Añade este bloque en el nivel superior de ~/.openclaw/openclaw.json:

"mcp": {
  "servers": {
    "claw-tsaver": {
      "command": "uvx",
      "args": ["--from", "git+https://github.com/Yang1Bai/claw-tsaver",
               "claw-tsaver-mcp"]
    }
  }
}

Luego reinicia la puerta de enlace de OpenClaw: openclaw gateway restart

Panel de control

Opcional: una interfaz web local para estadísticas de ahorro de tokens en tiempo real.

uvx --from git+https://github.com/Yang1Bai/claw-tsaver claw-tsaver-dashboard

Abre http://localhost:7878 en tu navegador.

Hoja de ruta

  • [x] Módulo A: proxy de expansión diferida (esta versión)

  • [x] Módulo D: panel de control local (esta versión)

  • [ ] Módulo B: enrutamiento de herramientas (carga automática solo de MCPs relevantes por turno)

  • [ ] Módulo C: compresión del historial de conversación (tarjetas de hechos atómicos)

Licencia

MIT — ver archivo LICENSE.

Contribución

Las incidencias y PRs son bienvenidas.

Available Tools

1 tool
expand_contentA

Retrieve the full content of a previously compressed tool result. Pass the expand_handle returned in the compressed envelope.

ParametersJSON Schema
NameRequiredDescriptionDefault
handleYesThe expand_handle from a compressed result.

TDQS

A4.2/5.0
Behavior3/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations provided; description implies a read operation but does not detail any side effects, auth requirements, or handle expiration.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Two efficient sentences front-load the purpose with no wasted words.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a single-parameter tool with no output schema, the description sufficiently guides usage, though output format is unstated.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The description adds context that the handle comes from a compressed envelope, complementing the schema's parameter description.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool retrieves the full content of a compressed result, using specific verb and resource.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description instructs to pass the expand_handle from a compressed envelope, implying the usage context, but lacks explicit conditions or exclusions.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Tool Schema Changelog

Recent tool additions, removals, and schema changes observed during successful MCP inspections.

  1. 1 tool updatev0.0.1
    • First observedexpand_content
Deploy Server
Shareable, User-Owned Context BackendPeople, applications, and agents read, write, and coordinate together in one context lake. Reach it over MCP, a CLI, a Python SDK, or REST.fulcradynamics.comAd

TDQS

A4.1/5.0

Scored across 1 tool

Disambiguation5/5

Only one tool exists, so there is no potential for confusion between different tools.

Naming Consistency5/5

With a single tool, there is no naming inconsistency to evaluate; the name 'expand_content' is clear and descriptive.

Tool Count2/5

A single tool for expanding compressed results is very thin; the server likely needs additional tools (e.g., for listing handles) to be useful as an MCP server.

Completeness4/5

The tool covers its stated purpose of retrieving full content, but the server lacks any supporting tools for compression or handle management, leaving a minor gap in the overall surface.

Maintenance

ActivityInactive
ResponsivenessNo issues

Resources

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