sequenceDiagram
    participant Client as Client/UI
    participant Store as Workflow Store
    participant Copilot as Copilot Tool
    participant Utils as executor/constants
    participant Executor as Execution Engine
    
    Note over Utils: Centralized utilities:<br/>normalizeName()<br/>PATTERNS (UUID, ENV_VAR)<br/>isCustomTool(), isMcpTool()<br/>escapeRegExp()

    Client->>Store: updateBlockName(id, name)
    Store->>Utils: normalizeName(name)
    Utils-->>Store: normalized name
    Store->>Store: Check if normalized name empty
    alt Empty normalized name
        Store-->>Client: {success: false}
    else Valid name
        Store->>Store: Find duplicate in blocks
        alt Duplicate found
            Store-->>Client: {success: false}
        else No duplicate
            Store->>Store: Update block name
            Store->>Utils: normalizeName() for references
            Store-->>Client: {success: true}
        end
    end

    Copilot->>Copilot: edit-workflow operation
    Copilot->>Utils: normalizeName(params.name)
    Utils-->>Copilot: normalized name
    alt Empty normalized name
        Copilot->>Copilot: logSkippedItem('missing_required_params')
    else Has duplicate
        Copilot->>Copilot: logSkippedItem('duplicate_block_name')
    else Valid
        Copilot->>Copilot: Apply operation
    end

    Client->>Executor: Execute workflow
    Executor->>Executor: collectBlockData()
    loop For each block
        Executor->>Utils: normalizeName(block.name)
        Utils-->>Executor: normalized name
        Executor->>Executor: blockNameMapping[normalized] = blockId
    end
    
    Executor->>Executor: Resolve variable reference
    Executor->>Executor: Direct O(1) lookup in blockNameMapping
    Note over Executor: Before: O(n) loop through mapping<br/>After: O(1) direct access