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Memory Server MCP

Memory Server MCP

by hridaya423
OverviewSchemaSourceRelated ServersDiscussionsAdmin
JavaScript
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save_memory

Store key-value pairs in persistent memory with optional tags and expiration settings to organize and manage data efficiently.

Instructions

Save a value with a key to memory, optionally with tags and expiration

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "key": "<key>",
      "value": "<value>"
    },
    "name": "save_memory"
  }
}

Input Schema

NameRequiredDescriptionDefault
keyYesThe key to store the value under
valueYesThe value to store
tagsNoOptional tags for categorization
expires_in_secondsNoOptional expiration time in seconds

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.2

TDQS

C2.9/5.0
Behavior2/5

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 implies a write/mutation operation ('Save') but doesn't specify if this overwrites existing keys, requires permissions, has rate limits, or what happens on success/failure. The optional features (tags, expiration) are mentioned but without details on their effects or defaults.

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 a single, efficient sentence that front-loads the core purpose and succinctly lists optional features. Every word serves a purpose with no redundancy or unnecessary elaboration, making it easy to parse quickly.

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

Completeness2/5

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

For a mutation tool with no annotations and no output schema, the description is incomplete. It doesn't explain what the tool returns, error conditions, or behavioral nuances like overwrite behavior. Given the complexity of memory operations and lack of structured data, more context is needed for effective use.

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 schema fully documents all 4 parameters. The description adds minimal value by naming the optional features ('tags' and 'expiration'), but doesn't provide additional context beyond what's in the schema descriptions. This meets the baseline for high schema coverage.

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

Purpose4/5

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

The description clearly states the action ('Save a value with a key to memory') and resource ('memory'), making the purpose immediately understandable. It distinguishes from siblings like 'delete_memory' or 'recall_memory' by specifying a save/write operation. However, it doesn't explicitly contrast with tools like 'link_memories' or 'search_memory_content', which slightly reduces differentiation.

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

Usage Guidelines2/5

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

The description provides no guidance on when to use this tool versus alternatives. It mentions optional features (tags and expiration) but doesn't indicate scenarios where this is preferred over other memory tools like 'list_memories' or 'search_memory_content'. There's no mention of prerequisites, constraints, or typical use cases.

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

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