MCP Memory SQLite

by spences10

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Server Quality Checklist

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Latest release: v0.0.4
Disambiguation5/5
Each tool has a clearly distinct purpose: create_entities and create_relations handle creation of different graph components, delete_entity and delete_relation handle deletion of different components, get_entity_with_relations focuses on a specific entity's context, read_graph provides a general overview, and search_nodes enables text-based discovery. There is no overlap in functionality that would cause confusion.
Naming Consistency5/5
All tools follow a consistent verb_noun pattern with snake_case: create_entities, create_relations, delete_entity, delete_relation, get_entity_with_relations, read_graph, and search_nodes. The naming is predictable and readable throughout the set.
Tool Count5/5
With 7 tools, this is well-scoped for a knowledge graph management server. Each tool earns its place by covering essential operations like creation, deletion, retrieval, and search, without being overly sparse or bloated.
Completeness5/5
The tool set provides complete CRUD/lifecycle coverage for entities and relations in a knowledge graph domain: create, read (via get_entity_with_relations, read_graph, search_nodes), update (implied via create_entities for updates), and delete. There are no obvious gaps that would hinder agent workflows.
Average 1.9/5 across 7 of 7 tools scored. Lowest: 1.3/5.
See the Tool Scores section below for per-tool breakdowns.
- No community issues in the last 6 months
- 0 commits in the last 12 weeks
- No stable releases found
- No critical vulnerability alerts
- No high-severity vulnerability alerts
- No code scanning findings
- CI status not available
This repository is licensed under MIT License.
This repository includes a README.md file.
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How is the quality score calculated?

The overall quality score combines two components: Tool Definition Quality (70%) and Server Coherence (30%).

Tool Definition Quality measures how well each tool describes itself to AI agents. Every tool is scored 1–5 across six dimensions: Purpose Clarity (25%), Usage Guidelines (20%), Behavioral Transparency (20%), Parameter Semantics (15%), Conciseness & Structure (10%), and Contextual Completeness (10%). The server-level definition quality score is calculated as 60% mean TDQS + 40% minimum TDQS, so a single poorly described tool pulls the score down.

Server Coherence evaluates how well the tools work together as a set, scoring four dimensions equally: Disambiguation (can agents tell tools apart?), Naming Consistency, Tool Count Appropriateness, and Completeness (are there gaps in the tool surface?).

Tiers are derived from the overall score: A (≥3.5), B (≥3.0), C (≥2.0), D (≥1.0), F (<1.0). B and above is considered passing.

Tool Scores

Behavior1/5
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 but provides none. It omits idempotency, error handling (e.g., duplicate relations), side effects, and return values.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Conciseness2/5
Is the description appropriately sized, front-loaded, and free of redundancy?
While brief (4 words), this represents under-specification rather than efficient conciseness. As with the calibration example 'Process', brevity here signals inadequacy, not clarity.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Completeness1/5
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Completely inadequate for a tool with nested object parameters and no output schema. Missing essential context: whether entities must exist first, valid relation types, and what the operation returns.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Parameters1/5
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 0%, and the description fails to compensate. It does not explain the 'relations' array structure or the semantics of 'source', 'target', and 'type' fields, leaving critical parameters undocumented.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Purpose2/5
Does the description clearly state what the tool does and how it differs from similar tools?
Tautological: description restates name/title.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Usage Guidelines1/5
Does the description explain when to use this tool, when not to, or what alternatives exist?
No guidance provided on when to use this tool versus alternatives (e.g., 'create_entities'), prerequisites (whether source/target entities must exist), or expected workflow. The description offers zero usage context.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
Behavior1/5
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, so the description must carry full disclosure burden for this destructive operation. It fails to mention whether deletion is permanent, if it cascades to related entities, required permissions, or rate limits. The word 'Delete' implies mutation but lacks critical safety context.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Conciseness2/5
Is the description appropriately sized, front-loaded, and free of redundancy?
While brief at only four words, this represents under-specification rather than effective conciseness. The single sentence fails to earn its place because it adds no information beyond what is already in the tool name, offering no value to the agent.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Completeness1/5
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a destructive graph operation with three parameters, no annotations, and no output schema, the description is grossly incomplete. It lacks explanation of the relation model (source-target-type triplet), deletion behavior, return values, or error conditions.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Parameters1/5
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
With 0% schema description coverage, the description must compensate by explaining the parameter semantics. It completely omits what 'source', 'target', and 'type' represent (likely entity IDs and relation type), leaving all three parameters undocumented and ambiguous.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Purpose2/5
Does the description clearly state what the tool does and how it differs from similar tools?
Tautological: description restates name/title.
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 like 'delete_entity' or how it interacts with the graph structure. There are no prerequisites, warnings about orphaned entities, or references to the creation tool 'create_relations' mentioned.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
Behavior2/5
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Without annotations, the description carries the full burden of behavioral disclosure. It mentions 'associated data' will be deleted (implying cascade), but fails to disclose critical safety information: whether deletion is permanent, what happens to relations (orphaned vs cascade), or required permissions for a destructive operation.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Conciseness2/5
Is the description appropriately sized, front-loaded, and free of redundancy?
While brief at only five words, this is under-specification rather than effective conciseness. For a destructive tool with zero annotation coverage, the description fails to earn its place by providing necessary safety and usage context within a compact form.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Completeness1/5
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Completely inadequate for a destructive operation. No annotations, no output schema, 0% parameter coverage, and a 5-word description provides insufficient context for safe invocation. Missing: irreversibility warnings, relation handling behavior, and parameter semantics.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Parameters1/5
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
With 0% schema description coverage for the 'name' parameter, the description fails to compensate by explaining what 'name' refers to (entity ID, display name, or unique identifier), its expected format, or how to obtain it. The parameter is completely undocumented.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Purpose2/5
Does the description clearly state what the tool does and how it differs from similar tools?
Tautological: description restates name/title.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Usage Guidelines1/5
Does the description explain when to use this tool, when not to, or what alternatives exist?
No guidance provided on when to use this tool versus alternatives like 'delete_relation' or whether to use 'get_entity_with_relations' first to inspect the entity. No prerequisites or warnings about irreversibility are mentioned.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
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 but offers minimal details. It mentions retrieving 'all' relations but does not specify traversal depth (immediate neighbors only? transitive closure?), response format, or error behavior when the named entity does not exist.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Conciseness3/5
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is a single sentence that efficiently restates the title. While not verbose, it is underspecified for the complexity of graph traversal operations—every sentence earns its place, but critical information is missing that should have been included.
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?
Given the complexity of knowledge graph traversal, zero schema descriptions, no annotations, and no output schema, the description is inadequate. It does not hint at the return structure (e.g., nested entity objects vs. edge lists), pagination behavior, or relation depth limits.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Parameters1/5
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 0% for the single 'name' parameter, and the description completely fails to compensate. It does not indicate whether 'name' refers to a unique identifier, display label, or URI format, leaving the agent without guidance on how to construct valid inputs.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Purpose2/5
Does the description clearly state what the tool does and how it differs from similar tools?
Tautological: description restates name/title.
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?
Provides no guidance on when to use this tool versus alternatives like 'search_nodes' (for finding entities) or 'read_graph' (for bulk access). Does not mention prerequisites such as needing to know the entity name in advance, nor does it warn about performance implications of fetching 'all' relations.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
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. While 'Create or update' suggests upsert semantics, it fails to specify merge behavior (observations appended or replaced?), side effects, return values, or authorization requirements.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Conciseness3/5
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is extremely brief (6 words), but this conciseness results from under-specification rather than efficient information density. It wastes the opportunity to provide essential context.
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?
Given the nested object structure (entities with name/entityType/observations), zero schema descriptions, and no output schema, the description is inadequate. It omits critical details about the data model and operation results.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Parameters2/5
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 0%, yet the description does not compensate by explaining the entities array structure, the semantic meaning of observations, or valid values for entityType. It merely mentions 'observations' without elaborating.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Purpose2/5
Does the description clearly state what the tool does and how it differs from similar tools?
Tautological: description restates name/title.
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?
No guidance provided on when to use this tool versus alternatives (e.g., when to create entities vs. relations), nor any prerequisites or conditions for the update behavior.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
Behavior2/5
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries full disclosure burden but offers minimal behavioral context. It does not specify the return format, pagination limits, what 'recent' quantifies, or whether this is a safe read-only operation despite the 'Get' verb implying so.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Conciseness3/5
Is the description appropriately sized, front-loaded, and free of redundancy?
While the single-sentence structure avoids verbosity, the extreme brevity constitutes under-specification rather than efficient communication. The sentence fails to earn its place by adding value beyond the tool name.
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 graph query tool with no output schema, the description inadequately explains return values. It mentions 'entities and their relations' but omits structure, depth of relation traversal, result count limits, and the definition of 'recent'—critical gaps for a retrieval tool.
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?
Input schema contains zero parameters. Per scoring guidelines, zero-parameter tools receive a baseline score of 4 since there are no parameter semantics to describe beyond the schema itself.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Purpose2/5
Does the description clearly state what the tool does and how it differs from similar tools?
Tautological: description restates name/title.
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?
No guidance provided on when to use this versus alternatives. Given siblings include specific entity retrieval (get_entity_with_relations) and search (search_nodes), the description should clarify that this returns unfiltered recent activity rather than targeted queries.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
Behavior3/5
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 successfully communicates pagination constraints (default 10, max 50) and result ordering (by relevance), but omits safety profile information (e.g., read-only status) or side effects.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Conciseness3/5
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is a single efficient sentence, but it is identical to the title, adding zero new information. This redundancy prevents a higher score despite the lack of fluff.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Completeness3/5
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
The description explains return behavior (result count limits and ordering) which partially compensates for the missing output schema. However, it lacks details on the structure of returned entities/relations or filtering capabilities, leaving gaps for a tool with 0% schema coverage.
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 0%, requiring the description to compensate. It implicitly documents the 'query' parameter as a 'text query' and the 'limit' parameter with specific bounds (default 10, max 50), providing adequate but not comprehensive semantic context.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Purpose2/5
Does the description clearly state what the tool does and how it differs from similar tools?
Tautological: description restates name/title.
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 like 'get_entity_with_relations' or 'read_graph'. It fails to indicate that text-based search is appropriate when the entity ID is unknown.
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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