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Support character-limit in list_sub tool

#428

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Pre-merge Checklist

  • Required for All PRs
    • Read contribution guidelines
    • PR title clearly describes the change
    • Commit history is clean with descriptive messages (cleanup guide)
    • Added comprehensive tests for new/modified functionality
    • Updated servers/Azure.Mcp.Server/CHANGELOG.md and/or servers/Fabric.Mcp.Server/CHANGELOG.md for product changes (features, bug fixes, UI/UX, updated dependencies)
  • For MCP tool changes:
    • One tool per PR: This PR adds or modifies only one MCP tool for faster review cycles
    • Updated servers/Azure.Mcp.Server/README.md and/or servers/Fabric.Mcp.Server/README.md documentation
    • Updated command list in /docs/azmcp-commands.md and/or /docs/fabric-commands.md
    • For new or modified tool descriptions, ran ToolDescriptionEvaluator and obtained a score of 0.4 or more and a top 3 ranking for all related test prompts
  • Extra steps for Azure MCP Server tool changes:
    • Updated test prompts in /docs/e2eTestPrompts.md
    • 👉 For Community (non-Microsoft team member) PRs:
      • Security review: Reviewed code for security vulnerabilities, malicious code, or suspicious activities before running tests (crypto mining, spam, data exfiltration, etc.)
      • Manual tests run: added comment /azp run mcp - pullrequest - live to run Live Test Pipeline

@xiangyan99 xiangyan99 marked this pull request as ready for review September 17, 2025 22:48
@xiangyan99 xiangyan99 requested a review from a team as a code owner September 17, 2025 22:48
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Pull Request Overview

This PR adds character-limit support to the Azure MCP Server's subscription list tool, allowing users to control response size through a new --character-limit parameter with a default limit of 10,000 characters. When the response exceeds the limit, subscriptions are automatically truncated with informative status messages.

Key changes:

  • Added --character-limit parameter to control response size with automatic truncation
  • Enhanced response messages to include character count and truncation status
  • Added comprehensive test coverage for various character limit scenarios

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file
File Description
CHANGELOG.md Documents the new character-limit parameter feature
SubscriptionListCommandTests.cs Adds extensive test coverage for character limit functionality
OptionDefinitions.cs Defines the new CharacterLimit option with 10,000 character default
SubscriptionListOptions.cs Adds CharacterLimit property to subscription list options
SubscriptionListCommand.cs Implements character limit logic with response truncation

@joshfree joshfree added this to the 2025-09 milestone Sep 19, 2025
@joshfree joshfree moved this from Untriaged to In Progress in Azure MCP Server Sep 19, 2025
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