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# Knowledge Graph Memory Server | ||
A basic MCP server implementation that provides persistent memory using a knowledge-graph. The server manages entities, their observations, and the relationships between them using a JSON-based file system. | ||
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# Core Concepts | ||
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## Entities | ||
Entities are the primary nodes in the knowledge graph. Each entity has: | ||
- A unique name (identifier) | ||
- An entity type (e.g., "person", "organization", "event") | ||
- A list of observations | ||
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Example: | ||
```json | ||
{ | ||
"name": "John_Smith", | ||
"entityType": "person", | ||
"observations": ["Lives in New York", "Works as a software engineer"] | ||
} | ||
``` | ||
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## Relations | ||
Relations define directed connections between entities. They are always stored in active voice and describe how entities interact or relate to each other. | ||
Example: | ||
```jsonCopy{ | ||
"from": "John_Smith", | ||
"to": "TechCorp", | ||
"relationType": "works_at" | ||
} | ||
``` | ||
## Observations | ||
Observations are discrete pieces of information about an entity. They are: | ||
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- Stored as strings | ||
- Attached to specific entities | ||
- Can be added or removed independently | ||
- Should be atomic (one fact per observation) | ||
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Example: | ||
```jsonCopy{ | ||
"entityName": "John_Smith", | ||
"observations": [ | ||
"Speaks fluent Spanish", | ||
"Graduated in 2019", | ||
"Prefers morning meetings" | ||
] | ||
} | ||
``` | ||
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# Tools | ||
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## Entity Management | ||
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- create_entities: Create new entities in the knowledge graph with names, types, and observations | ||
- delete_entities: Remove entities and their associated relations from the graph | ||
- add_observations: Add new observations to existing entities | ||
- delete_observations: Remove specific observations from entities | ||
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## Relation Management | ||
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- create_relations: Establish relationships between entities in active voice | ||
- delete_relations: Remove specific relationships between entities | ||
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## Query Tools | ||
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- read_graph: Retrieve the entire knowledge graph | ||
- search_nodes: Search for nodes based on names, types, and observation content | ||
- open_nodes: Access specific nodes by their names | ||
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# Prompts | ||
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The prompt for utilizing memory depends on the use case, but here is an example prompt for chat personalization. You could use this prompt in the "Custom Instructions" field of a Project | ||
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``` | ||
Follow these steps for each interaction: | ||
1. User Identification: | ||
- You should assume that you are interacting with default_user | ||
- If you have not identified default_user, proactively try to do so. | ||
2. Memory Retrieval: | ||
- Always begin your chat by saying only "Remembering..." and retrieve all relevant information from your knowledge graph | ||
- Always refer to your knowledge as your "memory" | ||
3. Memory | ||
- While conversing with the user, be attentive to any new information that falls into these categories: | ||
a) Basic Identity (Age, gender, location, Job title, education level, etc.) | ||
b) Behaviors (interests, habits, etc.) | ||
c) Preferences (communication style, preferred language, etc.) | ||
d) Goals/Psychology (Goals, targets, aspirations, etc.) | ||
e) Relationships (personal and professional relationships up to 3 degrees of separation) | ||
4. Memory Update: | ||
- If any new information was gathered during the interaction, update your memory as follows: | ||
a) Create nodes for recurring organizations, people, and significant events, connecting them to the current node. | ||
b) Store most facts as observations within these nodes | ||
- Try to perform all updates in one operation using the create and delete functions. | ||
``` |