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claude-code - 💡(How to fix) Fix [FEATURE] Add toolOutputLevel setting to control MCP tool call display verbosity [1 comments, 2 participants]

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anthropics/claude-code#45131•Fetched 2026-04-09 08:12:31
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Preflight Checklist

  • I have searched existing requests and this feature hasn't been requested yet
  • This is a single feature request (not multiple features)

Problem Statement

When using MCP servers , every tool call displays the full request parameters and response JSON in the output. For plugins that make many API calls, this creates significant visual noise — the user only cares about the result, not the raw payloads.

Proposed Solution

<p style="white-space: pre-wrap; margin-top: 0.1em; margin-bottom: 0.2em; color: rgb(204, 204, 204); font-family: -apple-system, &quot;system-ui&quot;, &quot;Segoe UI&quot;, Roboto, sans-serif; font-size: 13px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(24, 24, 24); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">Currently there is no way to control how MCP tool calls are rendered in the Claude Code UI (CLI or VSCode extension). Every call shows:</p><div class="codeBlockWrapper_-a7MRw" style="position: relative; margin: 8px 0px; color: rgb(204, 204, 204); font-family: -apple-system, &quot;system-ui&quot;, &quot;Segoe UI&quot;, Roboto, sans-serif; font-size: 13px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: rgb(24, 24, 24); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;"><button class="copyButton_CEmTFw copyButton_-a7MRw" title="Copy code" aria-label="Copy code to clipboard" style="color: rgb(204, 204, 204); font-family: -apple-system, &quot;system-ui&quot;, &quot;Segoe UI&quot;, Roboto, sans-serif; font-size: 13px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(31, 31, 31); border-color: rgb(69, 69, 69); border-style: solid; border-width: 1px; border-image: none 100% / 1 / 0 stretch; cursor: pointer; opacity: 0; display: flex; border-radius: 4px; justify-content: center; align-items: center; padding: 4px; transition: opacity 0.15s, background 0.15s; position: absolute; top: 4px; right: 4px;"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20" fill="currentColor" aria-hidden="true" data-slot="icon" class="copyIcon_CEmTFw"><path fill-rule="evenodd" d="M15.988 3.012A2.25 2.25 0 0 1 18 5.25v6.5A2.25 2.25 0 0 1 15.75 14H13.5v-3.379a3 3 0 0 0-.879-2.121l-3.12-3.121a3 3 0 0 0-1.402-.791 2.252 2.252 0 0 1 1.913-1.576A2.25 2.25 0 0 1 12.25 1h1.5a2.25 2.25 0 0 1 2.238 2.012ZM11.5 3.25a.75.75 0 0 1 .75-.75h1.5a.75.75 0 0 1 .75.75v.25h-3v-.25Z" clip-rule="evenodd"></path><path d="M3.5 6A1.5 1.5 0 0 0 2 7.5v9A1.5 1.5 0 0 0 3.5 18h7a1.5 1.5 0 0 0 1.5-1.5v-5.879a1.5 1.5 0 0 0-.44-1.06L8.44 6.439A1.5 1.5 0 0 0 7.378 6H3.5Z"></path></svg></button><pre style="overflow-x: auto; white-space: pre; box-sizing: border-box; border-radius: 4px; max-width: 100%; margin: 0px; padding: 8px;"><code style="font-family: monospace; color: rgb(208, 208, 208); background-color: rgb(60, 60, 60); padding: 0px; border-radius: 3px; word-break: break-word; font-size: 0.9em;">⏺ ai-project-poc - Ticket_list (MCP)(workspaceId: "69c13422...") ⎿ {"result":[{"tenantId":"69c13422...","workspaceId":"69c13422...","createTime":"03/23/2026",... </code></pre></div><p style="white-space: pre-wrap; margin-top: 0.1em; margin-bottom: 0.2em; color: rgb(204, 204, 204); font-family: -apple-system, &quot;system-ui&quot;, &quot;Segoe UI&quot;, Roboto, sans-serif; font-size: 13px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(24, 24, 24); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">For plugin developers building conversational UX on top of MCP servers, this breaks the experience — users see raw JSON, request bodies, and sometimes tokens in the output.</p><h2 style="color: rgb(204, 204, 204); font-family: -apple-system, &quot;system-ui&quot;, &quot;Segoe UI&quot;, Roboto, sans-serif; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: rgb(24, 24, 24); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">Proposed Solution</h2><p style="white-space: pre-wrap; margin-top: 0.1em; margin-bottom: 0.2em; color: rgb(204, 204, 204); font-family: -apple-system, &quot;system-ui&quot;, &quot;Segoe UI&quot;, Roboto, sans-serif; font-size: 13px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(24, 24, 24); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">Add a <code style="font-family: monospace; color: rgb(208, 208, 208); background-color: rgb(60, 60, 60); padding: 2px 4px; border-radius: 3px; word-break: break-word; font-size: 0.9em;">toolOutputLevel</code> setting with levels:</p> Level | Shows -- | -- full (default) | Tool name + parameters + full response compact | Tool name + parameters, response collapsed name-only | Only the tool name hidden | Tool calls run silently <p style="white-space: pre-wrap; margin-top: 0.1em; margin-bottom: 0.2em; color: rgb(204, 204, 204); font-family: -apple-system, &quot;system-ui&quot;, &quot;Segoe UI&quot;, Roboto, sans-serif; font-size: 13px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(24, 24, 24); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">Configurable globally or per-tool pattern:</p><div class="codeBlockWrapper_-a7MRw" style="position: relative; margin: 8px 0px; color: rgb(204, 204, 204); font-family: -apple-system, &quot;system-ui&quot;, &quot;Segoe UI&quot;, Roboto, sans-serif; font-size: 13px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: rgb(24, 24, 24); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;"><button class="copyButton_CEmTFw copyButton_-a7MRw" title="Copy code" aria-label="Copy code to clipboard" style="color: rgb(204, 204, 204); font-family: -apple-system, &quot;system-ui&quot;, &quot;Segoe UI&quot;, Roboto, sans-serif; font-size: 13px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(31, 31, 31); border-color: rgb(69, 69, 69); border-style: solid; border-width: 1px; border-image: none 100% / 1 / 0 stretch; cursor: pointer; opacity: 0; display: flex; border-radius: 4px; justify-content: center; align-items: center; padding: 4px; transition: opacity 0.15s, background 0.15s; position: absolute; top: 4px; right: 4px;"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20" fill="currentColor" aria-hidden="true" data-slot="icon" class="copyIcon_CEmTFw"><path fill-rule="evenodd" d="M15.988 3.012A2.25 2.25 0 0 1 18 5.25v6.5A2.25 2.25 0 0 1 15.75 14H13.5v-3.379a3 3 0 0 0-.879-2.121l-3.12-3.121a3 3 0 0 0-1.402-.791 2.252 2.252 0 0 1 1.913-1.576A2.25 2.25 0 0 1 12.25 1h1.5a2.25 2.25 0 0 1 2.238 2.012ZM11.5 3.25a.75.75 0 0 1 .75-.75h1.5a.75.75 0 0 1 .75.75v.25h-3v-.25Z" clip-rule="evenodd"></path><path d="M3.5 6A1.5 1.5 0 0 0 2 7.5v9A1.5 1.5 0 0 0 3.5 18h7a1.5 1.5 0 0 0 1.5-1.5v-5.879a1.5 1.5 0 0 0-.44-1.06L8.44 6.439A1.5 1.5 0 0 0 7.378 6H3.5Z"></path></svg></button><pre style="overflow-x: auto; white-space: pre; box-sizing: border-box; border-radius: 4px; max-width: 100%; margin: 0px; padding: 8px;"><code class="language-json" style="font-family: monospace; color: rgb(208, 208, 208); background-color: rgb(60, 60, 60); padding: 0px; border-radius: 3px; word-break: break-word; font-size: 0.9em;">{ "toolOutputLevel": { "default": "full", "mcp__ai_project_poc__*": "name-only", "Bash": "compact" } }</code></pre></div>

Alternative Solutions

No response

Priority

Medium - Would be very helpful

Feature Category

CLI commands and flags

Use Case Example

Building a Claude Code plugin for POC project using an MCP server for all backend calls. The plugin has careful UX rules but raw tool call display undermines the clean experience.

Additional Context

No response

extent analysis

TL;DR

Add a toolOutputLevel setting to control the level of detail displayed for tool calls, allowing for customization of the output to reduce visual noise.

Guidance

  • Introduce a toolOutputLevel setting with options for full, compact, name-only, and hidden to give users control over the level of detail displayed for tool calls.
  • Allow the toolOutputLevel setting to be configured globally or per-tool pattern to provide flexibility in managing output.
  • Consider implementing the toolOutputLevel setting as a configurable option in the CLI or VSCode extension to make it easily accessible to users.
  • Test the toolOutputLevel setting with different tool calls and output levels to ensure it functions as expected and reduces visual noise.

Example

{
  "toolOutputLevel": {
    "default": "full",
    "mcp__ai_project_poc__*": "name-only",
    "Bash": "compact"
  }
}

This example shows how the toolOutputLevel setting can be configured to display only the tool name for MCP server tool calls, while displaying compact output for Bash tool calls.

Notes

The implementation of the toolOutputLevel setting will depend on the specific requirements and constraints of the Claude Code plugin and MCP server. Additional testing and validation may be necessary to ensure the setting works correctly in different scenarios.

Recommendation

Apply the proposed solution by adding the toolOutputLevel setting to provide users with control over the level of detail displayed for tool calls, reducing visual noise and improving the overall user experience.

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