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Memstate AI - Agent Memory System

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Memstate AI - MCP

npm version License: MIT MCP Node memstate-mcp MCP server

Memoria versionada para agentes de IA. Almacena hechos, detecta conflictos y realiza un seguimiento de cómo cambian las decisiones con el tiempo, expuesto como un servidor MCP alojado.

Panel de control · Documentación · Precios


¿Por qué Memstate?

RAG (la mayoría de los otros sistemas de memoria)

Memstate AI

Uso de tokens por conversación

~7,500

~1,500

Visibilidad del agente

Caja negra

Transparencia total

Versionado de memoria

Ninguno

Historial completo

Crecimiento de tokens a medida que la memoria escala

O(n)

O(1)

Infraestructura requerida

Sí

Ninguna — SaaS alojado

Otros sistemas de memoria vuelcan todo en tu ventana de contexto y esperan lo mejor. Memstate le da a tu agente una base de conocimientos estructurada y versionada que navega con precisión: carga solo lo que necesitas, sabe qué cambió y sabe cuándo los hechos entran en conflicto.


Related MCP server: BuildAutomata Memory MCP Server

Benchmarks

Creamos un conjunto de pruebas de referencia de código abierto que evalúa lo que realmente importa para la memoria de un agente: ¿puede tu sistema almacenar hechos, recordarlos con precisión entre sesiones, detectar conflictos cuando las cosas cambian y mantener el contexto a medida que un proyecto evoluciona?

Comparativa: Memstate AI vs Mem0

Ambos sistemas fueron probados bajo condiciones idénticas usando el mismo agente (Claude Sonnet 4.6, temperatura 0), los mismos escenarios y la misma rúbrica de puntuación.

Métrica

Memstate AI

Mem0

Ganador

Puntuación Global

69.1

15.4

Memstate

Precisión (recuerdo de hechos)

74.1

12.6

Memstate

Detección de conflictos

85.5

19.0

Memstate

Continuidad del contexto

63.7

10.1

Memstate

Eficiencia de tokens

22.3

30.6

Mem0

Pesos de puntuación: Precisión 40%, Detección de conflictos 25%, Continuidad del contexto 25%, Eficiencia de tokens 10%.

Desglose por escenario

El benchmark ejecuta cinco escenarios del mundo real que simulan flujos de trabajo de agentes en múltiples sesiones:

Escenario

Memstate AI

Mem0

Evolución de la arquitectura de la aplicación web

43.2

55.6

Migración del sistema de autenticación

66.2

10.2

Evolución del esquema de base de datos

72.7

7.0

Conflictos de versionado de API

86.5

0.9

Reversión de decisiones del equipo

77.2

3.3

Mem0 ganó el primer escenario (seguimiento simple de arquitectura), pero tuvo serias dificultades en escenarios que requerían manejo de contradicciones, contexto entre sesiones y seguimiento de reversión de decisiones, obteniendo una puntuación cercana a cero en tres de los cinco escenarios.

Por qué gana Memstate

El benchmark revela una diferencia arquitectónica fundamental:

Mem0 utiliza búsqueda semántica basada en embeddings. Los hechos se fragmentan, se convierten en embeddings y se recuperan por similitud. Esto funciona para búsquedas simples, pero falla cuando:

  • Los hechos contradicen hechos anteriores (el sistema no puede distinguir lo actual de lo obsoleto)

  • Se necesita una recuperación precisa (los embeddings devuelven resultados "similares", no exactos)

  • La latencia de escritura a lectura importa (las nuevas memorias tardan segundos en ser buscables)

Memstate utiliza almacenamiento clave-valor estructurado y versionado. Cada hecho vive en una ruta de clave explícita con un historial de versiones completo. Esto significa:

  • La detección de conflictos está integrada: cuando un nuevo hecho contradice uno antiguo, el sistema lo sabe y conserva ambas versiones

  • La recuperación es determinista: obtienes exactamente lo que se almacenó, no una coincidencia aproximada

  • La continuidad entre sesiones es fiable: el agente navega por un árbol estructurado en lugar de esperar que la búsqueda semántica muestre el contexto correcto

  • El costo de tokens se mantiene en O(1): el agente carga resúmenes primero y profundiza en los detalles solo cuando es necesario, en lugar de volcar todos los embeddings potencialmente relevantes en la ventana de contexto

Notas sobre la imparcialidad

  • Ambos sistemas utilizaron el mismo modelo de agente, temperatura y rúbrica de evaluación

  • A Mem0 se le dio un retraso de ingesta de 10 segundos entre escrituras y lecturas para tener en cuenta su canalización de embedding asíncrona

  • Mem0 obtiene una puntuación más alta en eficiencia de tokens, pero esta métrica debe leerse en contexto: un menor uso de tokens puede simplemente reflejar que se devuelve menos información. Un sistema que recupera hechos incompletos o incorrectos utiliza menos tokens por respuesta, pero puede requerir más llamadas de seguimiento, lo que en última instancia cuesta más tokens para llegar a la misma respuesta

  • El código fuente del benchmark se incluye en este repositorio para una reproducibilidad total

  • Mem0 puede funcionar de manera diferente con una configuración personalizada o un modelo de embedding diferente


Inicio rápido

Obtén tu clave API en memstate.ai/dashboard, luego agrégala a la configuración de tu cliente MCP:

{
  "mcpServers": {
    "memstate": {
      "command": "npx",
      "args": ["-y", "@memstate/mcp"],
      "env": {
        "MEMSTATE_API_KEY": "YOUR_API_KEY_HERE"
      }
    }
  }
}

Sin Docker. Sin base de datos. Sin infraestructura. Ejecutándose en 60 segundos.


Configuración del cliente

Claude Desktop

Ubicación de la configuración:

  • macOS: ~/Library/Application Support/Claude/claude_desktop_config.json

  • Windows: %APPDATA%\Claude\claude_desktop_config.json

{
  "mcpServers": {
    "memstate": {
      "command": "npx",
      "args": ["-y", "@memstate/mcp"],
      "env": { "MEMSTATE_API_KEY": "YOUR_API_KEY_HERE" }
    }
  }
}

Claude Code

claude mcp add memstate npx @memstate/mcp -e MEMSTATE_API_KEY=YOUR_API_KEY_HERE

Cursor

En Configuración de Cursor → MCP → Agregar servidor: el mismo formato JSON que Claude Desktop arriba.

Cline / Windsurf / Kilo Code / Roo Code

Todos admiten el mismo formato de configuración MCP stdio. Agrégalo al archivo de configuración MCP de tu cliente.


Herramientas principales

Herramienta

Cuándo usarla

memstate_remember

Almacena markdown, resúmenes de tareas, decisiones. El servidor extrae rutas de clave y detecta conflictos automáticamente. Úsala para la mayoría de las escrituras.

memstate_set

Establece una ruta de clave única a un valor corto (ej. config.port = 8080). No para prosa.

memstate_get

Explora todas las memorias de un proyecto o subárbol. Úsala al inicio de cada tarea.

memstate_search

Búsqueda semántica por significado cuando no conoces la ruta de clave exacta.

memstate_history

Mira cómo cambió una pieza de conocimiento con el tiempo: cadena de versiones completa.

memstate_delete

Eliminación lógica de una ruta de clave. Crea una marca de eliminación; se conserva el historial completo.

memstate_delete_project

Eliminación lógica de un proyecto completo y todas sus memorias.

Cómo funcionan las rutas de clave (keypaths)

Las memorias se organizan en notación de puntos jerárquica:

project.my_app.database.schema
project.my_app.auth.provider
project.my_app.deploy.environment

Las rutas de clave tienen prefijo automático: keypath="database" con project_id="my_app" → project.my_app.database. Tu agente puede profundizar exactamente en lo que necesita: sin volcados de contexto completo.


Cómo funciona

Agent: memstate_remember(project_id="my_app", content="## Auth\nUsing SuperTokens...")
         ↓
Server extracts keypaths:  [project.my_app.auth.provider, ...]
         ↓
Conflict detection:  compare against existing memories at those keypaths
         ↓
New version stored — old version preserved in history chain
         ↓
Next session: memstate_get(project_id="my_app") → structured summaries only
         ↓
Agent drills into project.my_app.auth only when it needs auth details

El costo de tokens se mantiene constante independientemente de cuántas memorias totales existan.


Agregar a las instrucciones de tu agente

Copia esto en tu AGENTS.md o prompt del sistema:

## Memory (Memstate MCP)

### Before each task
- memstate_get(project_id="my_project") — browse existing knowledge
- memstate_search(query="topic", project_id="my_project") — find by meaning

### After each task
- memstate_remember(project_id="my_project", content="## Summary\n- ...", source="agent")

### Tool guide
- memstate_remember — markdown summaries, decisions, task results (preferred)
- memstate_set — single short values only (config flags, status)
- memstate_get — browse/retrieve before tasks
- memstate_search — semantic lookup when keypath unknown
- memstate_history — audit how knowledge evolved
- memstate_delete — remove outdated memories (history preserved)

Variables de entorno

Variable

Predeterminado

Descripción

MEMSTATE_API_KEY

(requerido)

Clave API de memstate.ai/dashboard

MEMSTATE_MCP_URL

https://mcp.memstate.ai

Sustitución para implementaciones autohospedadas

Verifica tu conexión

MEMSTATE_API_KEY=your_key npx @memstate/mcp --test

Imprime todas las herramientas disponibles y confirma que tu clave API funciona.

Creado para agentes de IA que merecen saber lo que saben.

Available Tools

7 tools
memstate_deleteA

Soft-delete a memory by keypath. Creates a tombstone version preserving full history. The memory can be un-deleted by setting a new value at the same keypath.

USE THIS WHEN: You need to remove outdated or incorrect memories, clean up a keypath subtree, or mark memories as no longer relevant. NOT FOR: Updating content (use memstate_set or memstate_remember to overwrite with new content instead).

memstate_delete(project_id="myapp", keypath="config.old_setting") memstate_delete(project_id="myapp", keypath="config", recursive=true) → deletes config and all children

History is preserved. Use memstate_history to see the deletion in the version chain. Keypath is auto-prefixed.

NameRequiredDescriptionDefault
project_idYesRequired. Project containing the memory.
keypathYesRequired. Keypath to delete (auto-prefixed with 'project.{project_id}.').
recursiveNoIf true, delete the entire keypath subtree. Default: false.

Output Schema

NameRequiredDescription
resultYes

TDQS

A4.5/5.0
Behavior4/5

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It effectively describes key behavioral traits: soft-deletion (not permanent), tombstone creation, history preservation, undeletion capability, and auto-prefixing behavior. It also references memstate_history for viewing deletions. The only minor gap is lack of explicit mention about permissions or error conditions.

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?

The description is well-structured with clear sections, uses bold headings for emphasis, includes practical examples, and every sentence adds value. It's appropriately sized for a tool with important behavioral nuances and sibling distinctions.

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

Completeness5/5

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

Given the tool's complexity (soft-deletion with history preservation), the description provides comprehensive context. With no annotations but an output schema present, it covers behavioral aspects thoroughly while appropriately deferring return value details to the output schema. It addresses key sibling relationships and usage scenarios.

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

Parameters3/5

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

Schema description coverage is 100%, so the baseline is 3. The description adds some value by providing concrete examples with project_id='myapp' and showing recursive behavior, but doesn't significantly enhance the parameter understanding beyond what the schema already documents clearly.

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 specific action ('soft-delete a memory by keypath') and distinguishes it from siblings by explaining it creates tombstone versions and preserves history. It explicitly contrasts with memstate_set and memstate_remember for updating content.

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

Usage Guidelines5/5

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

The description includes explicit 'USE THIS WHEN' and 'NOT FOR' sections that provide clear guidance on when to use this tool versus alternatives. It mentions specific scenarios (removing outdated memories, cleaning up subtrees) and names alternative tools for different use cases.

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

memstate_delete_projectA

Soft-delete an entire project and all its memories. Creates tombstone versions for every memory, preserving full history. The project is hidden from listings but can be restored by creating a new project with the same ID.

USE THIS WHEN: You want to remove all memories for a project, e.g. cleaning up test data or decommissioning a project.

memstate_delete_project(project_id="old-project")

All memories get individual tombstone versions. History is preserved via memstate_history.

NameRequiredDescriptionDefault
project_idYesRequired. Project ID to soft-delete.

Output Schema

NameRequiredDescription
resultYes

TDQS

A4.6/5.0
Behavior4/5

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

With no annotations provided, the description carries the full burden and does so well. It discloses key behavioral traits: it's a soft-delete (not permanent), creates tombstone versions for all memories, preserves history, hides the project from listings, and can be restored by creating a new project with the same ID. It doesn't mention rate limits or auth needs, but covers the essential destructive nature and recovery mechanism adequately.

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

Conciseness4/5

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

The description is appropriately sized and front-loaded with the core action. The 'USE THIS WHEN' section is helpful but slightly repetitive of the purpose. The example usage is concise and adds clarity. Minor improvements could tighten it, but overall it's efficient with minimal waste.

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

Completeness5/5

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

Given the tool's complexity (destructive operation with recovery), no annotations, and an output schema (which handles return values), the description is complete. It covers purpose, usage, behavior, and parameters adequately, providing all necessary context for an agent to invoke it correctly without over-explaining.

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 schema description coverage is 100%, so the baseline is 3. The description adds value by providing an example usage (memstate_delete_project(project_id='old-project')) which clarifies the parameter's role in context, though it doesn't add deep semantic details beyond what the schema already states ('Required. Project ID to soft-delete.').

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 specific action ('soft-delete an entire project and all its memories') and distinguishes it from siblings like memstate_delete (which likely deletes individual memories) by specifying it affects the entire project. It explains the outcome (creates tombstone versions, preserves history, hides from listings) which clarifies the scope beyond just the name.

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

Usage Guidelines5/5

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

It includes an explicit 'USE THIS WHEN' section that provides clear guidance: 'You want to remove all memories for a project, e.g. cleaning up test data or decommissioning a project.' This directly tells the agent when to use this tool versus alternatives, with practical examples.

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

memstate_getA

Browse and retrieve memories. Use BEFORE starting tasks to fetch existing knowledge.

USE THIS WHEN: You need to read what's already stored — list projects, browse a project tree, or get content at a keypath. NOT FOR: Saving new content (use memstate_remember for markdown/summaries, memstate_set for one keypath value).

memstate_get() → list all projects memstate_get(project_id="myapp") → full project tree memstate_get(project_id="myapp", keypath="database") → subtree memstate_get(project_id="myapp", keypath="db", include_content=true) → with full content memstate_get(memory_id="mem_abc123") → single memory by ID

Keypath is auto-prefixed. Default recursive=true.

NameRequiredDescriptionDefault
project_idNoProject to retrieve from. If omitted, lists all projects.
keypathNoSubkeypath within project. If omitted with project_id, returns the full project tree.
memory_idNoAlternative: get a single memory by its UUID
recursiveNoInclude subtree (default: true)
include_contentNoIf true, include full memory content in response (not just keypaths)
at_revisionNoOptional revision number for time-travel queries
content_limitNoMax memories to hydrate when include_content=true (default: 200, max: 1000)

Output Schema

NameRequiredDescription
resultYes

TDQS

A4.5/5.0
Behavior4/5

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

With no annotations provided, the description carries full burden and adds valuable behavioral context. It explains that 'Keypath is auto-prefixed' and 'Default recursive=true', which are important behavioral traits not evident from the schema alone. It also provides example usage patterns showing different parameter combinations and their effects.

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?

The description is well-structured with clear sections, bullet points for examples, and zero wasted text. Every sentence serves a purpose: establishing context, providing usage guidelines, showing examples, and noting important defaults. It's appropriately sized for a tool with 7 parameters and complex usage patterns.

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

Completeness5/5

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

Given the tool's complexity (7 parameters, multiple usage patterns) and the presence of an output schema, the description is complete. It covers purpose, guidelines, behavioral traits, and provides concrete examples. The output schema existence means the description doesn't need to explain return values, and it adequately addresses the tool's scope and limitations.

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

Parameters3/5

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

Schema description coverage is 100%, so the baseline is 3. The description adds some value through the usage examples that show how parameters combine (e.g., project_id alone vs. with keypath, include_content=true), but doesn't provide significant additional semantic meaning beyond what's already documented in the schema descriptions.

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's purpose: 'Browse and retrieve memories' with specific verbs and resources. It distinguishes from siblings by explicitly contrasting with memstate_remember (for saving markdown/summaries) and memstate_set (for one keypath value), making the distinction clear.

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

Usage Guidelines5/5

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

The description provides explicit guidance: 'Use BEFORE starting tasks to fetch existing knowledge' and includes dedicated 'USE THIS WHEN:' and 'NOT FOR:' sections. It names specific alternatives (memstate_remember, memstate_set) and gives concrete scenarios for when to use this tool (list projects, browse project tree, get content at keypath).

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

memstate_historyA

View version history for a keypath or memory chain. Use when you need to see how a value changed over time.

USE THIS WHEN: Debugging past state, auditing changes, or recovering a previous value. NOT FOR: Reading current content (use memstate_get) or saving (use memstate_remember or memstate_set).

memstate_history(project_id="myapp", keypath="config.database.port") memstate_history(memory_id="mem_abc123")

Returns all versions with timestamps; latest is marked is_latest=true.

NameRequiredDescriptionDefault
project_idNoRequired with keypath
keypathNoGet history for this keypath
memory_idNoOr get history for a specific memory chain by ID

Output Schema

NameRequiredDescription
resultYes

TDQS

A4.7/5.0
Behavior4/5

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It effectively describes the tool's behavior: it returns 'all versions with timestamps' and marks the latest with 'is_latest=true.' However, it lacks details on potential limitations like rate limits, pagination, or error conditions, which would be helpful for a read operation with historical data.

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?

The description is well-structured and front-loaded: it starts with the core purpose, followed by usage guidelines, examples, and return details. Every sentence adds value—no waste. The use of bold headers and code examples improves readability without unnecessary verbosity.

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

Completeness5/5

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

Given the tool's moderate complexity (3 parameters, no annotations, but with an output schema), the description is complete enough. It covers purpose, usage, parameters, and return values. Since an output schema exists, the description doesn't need to explain return values in detail, and it adequately addresses the context provided by sibling tools and schema coverage.

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 input schema has 100% description coverage, so the baseline is 3. The description adds value by clarifying parameter semantics: it explains that 'project_id' is 'Required with keypath' (though this is also in the schema) and provides example usage with both 'keypath' and 'memory_id', showing how they are used alternatively. This enhances understanding beyond the schema's basic descriptions.

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's purpose: 'View version history for a keypath or memory chain.' It specifies the verb ('view') and resource ('version history'), and distinguishes it from siblings by explicitly naming alternatives (memstate_get for current content, memstate_remember/memstate_set for saving). This is specific and avoids tautology.

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

Usage Guidelines5/5

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

The description provides explicit usage guidelines with dedicated sections: 'USE THIS WHEN:' lists debugging, auditing, and recovery scenarios, and 'NOT FOR:' explicitly names when not to use it (reading current content or saving) and specifies alternative tools (memstate_get, memstate_remember, memstate_set). This gives clear context and exclusions.

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

memstate_rememberA

Save markdown, task summaries, or any text. Server extracts keypaths and creates structured memories automatically. This is the PREFERRED way to save information.

USE THIS WHEN: Saving task summaries, meeting notes, docs, or any text with multiple facts. The server handles organization, conflict detection, and versioning. NOT FOR: Setting one specific keypath to a short value (e.g. config.port = "8080") — use memstate_set for that.

memstate_remember(project_id="myapp", content="## Task Summary\n- Added OAuth\n- Files: auth.go, middleware.go", source="agent") memstate_remember(project_id="myapp", content="Architecture decision: migrated to JWT tokens for session management")

Content limit: 100,000 chars. Processing is async (~15-18s); returns job_id immediately.

NameRequiredDescriptionDefault
project_idYesRequired. Project to store in (e.g. 'myapp'). Auto-creates if new.
contentYesMarkdown or text to remember (max 100,000 chars). Server extracts keypaths and creates structured memories automatically.
sourceNoSource type: agent, readme, docs, meeting, code
contextNoOptional hint to guide keypath extraction

Output Schema

NameRequiredDescription
resultYes

TDQS

A4.5/5.0
Behavior4/5

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

With no annotations provided, the description carries full burden and does well by disclosing key behavioral traits: content limit (100,000 chars), async processing with timing (~15-18s), immediate job_id return, automatic project creation, and server-side organization/conflict detection/versioning. It doesn't mention error conditions or retry behavior, keeping it from a perfect score.

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?

The description is efficiently structured with clear sections, front-loaded key information, and every sentence adds value. It uses bold headings for guidance, includes practical examples, and provides critical constraints without unnecessary elaboration.

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

Completeness5/5

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

Given the tool's complexity (async processing, automatic extraction), 100% schema coverage, and presence of an output schema, the description provides excellent context. It covers purpose, usage guidelines, behavioral traits, constraints, and examples, making it complete enough for an agent to understand when and how to use this tool effectively.

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

Parameters3/5

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

Schema description coverage is 100%, so the baseline is 3. The description adds minimal parameter semantics beyond the schema: it reinforces content limits and provides example values in the code snippets, but doesn't significantly enhance understanding of parameters beyond what the schema already documents well.

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's purpose: 'Save markdown, task summaries, or any text' with server-side extraction of keypaths and structured memory creation. It explicitly distinguishes from sibling tools by stating this is the 'PREFERRED way to save information' and contrasting with memstate_set for specific keypath assignments.

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

Usage Guidelines5/5

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

The description provides explicit guidance with dedicated 'USE THIS WHEN:' and 'NOT FOR:' sections, listing specific use cases (task summaries, meeting notes, docs) and clear exclusions (setting one specific keypath to short values). It names the alternative tool (memstate_set) for excluded scenarios.

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

memstate_setA

Set one keypath to a short value. Only for simple key=value facts like config, status, or version numbers.

USE THIS WHEN: You need to store ONE specific value at a known keypath (e.g. a port number, a status flag, a version string). NOT FOR: Task summaries, markdown, or text with multiple facts — use memstate_remember instead.

memstate_set(project_id="myapp", keypath="config.database.port", value="5432") memstate_set(project_id="myapp", keypath="status.deployment", value="production") memstate_set(project_id="myapp", keypath="version.current", value="2.1.0")

Value limit: 2,000 chars. If longer, use memstate_remember instead. Keypath is auto-prefixed.

NameRequiredDescriptionDefault
project_idYesRequired. Project to store in (e.g. 'myapp'). Auto-creates if new.
keypathYesRequired. Hierarchical path like 'config.port' or 'status'. Auto-prefixed with 'project.{project_id}.'
valueYesThe value to store (max 2,000 chars). Short, simple values only — not markdown.
categoryNoCategory: decision, preference, fact, task, context, requirement, note, code, learning
topicsNoOptional additional topics/tags

Output Schema

NameRequiredDescription
resultYes

TDQS

A4.5/5.0
Behavior4/5

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

With no annotations provided, the description carries full burden and delivers well. It discloses key behavioral traits: value limit (2,000 chars), auto-prefixing of keypath, and that it's for storage/mutation (implied by 'set'). It doesn't mention error conditions, permissions, or rate limits, but provides substantial operational context beyond basic function.

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?

The description is perfectly structured and concise. It opens with the core purpose, provides clear usage guidelines in dedicated sections, includes practical examples, and adds important constraints. Every sentence earns its place with no wasted words, and information is front-loaded appropriately.

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

Completeness5/5

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

Given the tool's moderate complexity (storage operation with 5 parameters), 100% schema coverage, and presence of an output schema, the description is complete. It covers purpose, usage guidelines, constraints, and provides examples. The output schema means return values don't need explanation in the description.

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

Parameters3/5

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

Schema description coverage is 100%, so the baseline is 3. The description adds minimal parameter semantics beyond the schema: it reinforces that value should be 'short, simple values only' and provides concrete examples of keypath usage. However, it doesn't explain the optional 'category' parameter's purpose or provide guidance on when to use topics.

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's purpose: 'Set one keypath to a short value' with specific examples of what to store (config, status, version numbers). It explicitly distinguishes from sibling memstate_remember by stating 'Only for simple key=value facts' and 'NOT FOR: Task summaries, markdown, or text with multiple facts.'

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

Usage Guidelines5/5

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

The description provides explicit usage guidance with dedicated sections: 'USE THIS WHEN:' for appropriate scenarios (storing one specific value at known keypath) and 'NOT FOR:' for exclusions (task summaries, markdown, multi-fact text). It names the alternative tool (memstate_remember) and includes a value length threshold (2,000 chars) for when to switch tools.

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 updatev1.0.2
    • Changedmemstate_search1 field changed
      • changedInput schema / properties / query / description
        Previous value: -"Natural language search query"New value: +"Natural language search query. Leave empty to explore/list all memories ordered by keypath."
  2. 7 tool updatesv1.0.1
    • First observedmemstate_delete
    • First observedmemstate_delete_project
    • First observedmemstate_get
    • First observedmemstate_history
    • First observedmemstate_remember
    • First observedmemstate_search
    • First observedmemstate_set

TDQS

A4.7/5.0

Scored across 7 tools

Disambiguation5/5

Each tool has a clearly distinct purpose with minimal overlap. The descriptions explicitly differentiate tools (e.g., memstate_remember vs. memstate_set, memstate_get vs. memstate_search) and include 'USE THIS WHEN' and 'NOT FOR' sections that prevent confusion. The tools cover different aspects of memory management without redundancy.

Naming Consistency5/5

All tools follow a consistent 'memstate_verb' naming pattern (e.g., memstate_delete, memstate_get, memstate_search). This uniformity makes it easy to identify the server's tools and their functions at a glance, with no deviations in style or structure across the set.

Tool Count5/5

With 7 tools, the server is well-scoped for an agent memory system. Each tool serves a specific, necessary function (e.g., create, read, update, delete, search, history, project management), and there are no extraneous tools. The count aligns with the domain's complexity without being overwhelming or insufficient.

Completeness5/5

The tool set provides comprehensive coverage for memory management, including CRUD operations (memstate_remember/set for create/update, memstate_get for read, memstate_delete for delete), search (memstate_search), version history (memstate_history), and project-level management (memstate_delete_project). There are no obvious gaps; agents can handle full memory lifecycles and workflows effectively.

Maintenance

ActivityInactive
ResponsivenessNo issues

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