---
description: Resource and Tool interaction flows in Model Context Protocol
---
# MCP Resource and Tool Flows
## Resource Management Flow
```mermaid
flowchart TD
subgraph Client ["Client Side"]
direction TB
RC[Resource Client]
subgraph Handlers ["Resource Handlers"]
direction LR
RH[Resource Handler]
Cache[Resource Cache]
Stream[Resource Streamer]
Val[Resource Validator]
end
end
subgraph Server ["Server Side"]
direction TB
RM[Resource Manager]
subgraph Storage ["Resource Storage"]
direction LR
RS[Resource Store]
RV[Resource Validator]
RL[Resource Lock Manager]
RW[Resource Watcher]
end
end
RC -->|1. Request Resource| RH
RH -->|2. Validate Request| Val
Val -->|3. Check Cache| Cache
Cache -->|4a. Cache Hit| RH
Cache -->|4b. Cache Miss| RC
RC -->|5. Fetch Resource| RM
RM -->|6. Validate Access| RV
RM -->|7. Acquire Lock| RL
RM -->|8. Read Data| RS
RS -->|9. Return Data| RM
RM -->|10. Release Lock| RL
RM -->|11. Return| RC
RC -->|12. Update Cache| Cache
RC -->|13. Setup Stream| Stream
Stream -->|14. Watch Changes| RW
RW -->|15. Notify Changes| Stream
style Client fill:#e1f3d8,stroke:#82c458
style Server fill:#ffd7d7,stroke:#ff8080
style Handlers fill:#f0f9eb,stroke:#82c458
style Storage fill:#ffe6e6,stroke:#ff8080
```
## Tool Execution Flow
```mermaid
sequenceDiagram
participant C as Client
participant TH as Tool Handler
participant TV as Tool Validator
participant TE as Tool Executor
participant R as Resources
participant P as Progress Monitor
C->>TH: Execute Tool
activate TH
TH->>TV: Validate Arguments
activate TV
alt Invalid Arguments
TV-->>TH: Validation Error
TH-->>C: Error Response
else Valid Arguments
TV-->>TH: Arguments OK
deactivate TV
TH->>TE: Execute Tool
activate TE
TE->>P: Start Progress
activate P
loop Resource Access
TE->>R: Request Resource
R-->>TE: Resource Data
TE->>P: Update Progress
P-->>C: Progress Event
end
alt Execution Success
TE-->>TH: Execution Result
deactivate TE
P->>P: Complete
P-->>C: Complete Event
deactivate P
TH-->>C: Success Response
else Execution Error
TE-->>TH: Error Details
P->>P: Failed
P-->>C: Error Event
TH-->>C: Error Response
end
end
deactivate TH
```
## Resource Content Types
```mermaid
classDiagram
class ResourceContent {
+uri: string
+mimeType: string
+content: any
+metadata: Metadata
+validate()
+transform()
}
class TextContent {
+text: string
+encoding: string
+lineCount: number
+wordCount: number
}
class BinaryContent {
+blob: Uint8Array
+encoding: string
+size: number
+checksum: string
}
class JSONContent {
+json: object
+schema: JSONSchema
+validate()
+query(path: string)
}
class StreamContent {
+stream: ReadableStream
+chunkSize: number
+encoding: string
+pause()
+resume()
}
class Metadata {
+created: Date
+modified: Date
+version: string
+tags: string[]
}
ResourceContent <|-- TextContent
ResourceContent <|-- BinaryContent
ResourceContent <|-- JSONContent
ResourceContent <|-- StreamContent
ResourceContent *-- Metadata
```
## Tool Categories and Relationships
```mermaid
mindmap
root((MCP Tools))
Resource Tools
List Resources
Filter by Pattern
Sort Results
Paginate Results
Read Resource
Cache Management
Streaming Support
Version Control
Write Resource
Validation
Locking
History
Watch Resource
Event Filtering
Rate Limiting
Batching
System Tools
Execute Command
Input/Output Handling
Environment Management
Security Controls
File Operations
Read/Write
Search
Watch
Process Management
Start/Stop
Monitor
Logging
Integration Tools
Connect Server
Authentication
Capability Negotiation
Health Checks
Manage Cache
Invalidation
Prefetching
Statistics
Stream Data
Backpressure
Error Recovery
Reconnection
Utility Tools
Schema Validation
JSON Schema
Custom Rules
Error Reporting
Data Transform
Format Conversion
Filtering
Aggregation
Content Analysis
Syntax Check
Security Scan
Metrics
```
