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Developer finds two undocumented bugs in Claude's MCP Apps

By PulseAugur Editorial · [1 sources] ·

A developer encountered two undocumented bugs while building an open-source task panel for Claude using MCP Apps. The first bug involved the `resourceUri` field, which has two seemingly valid locations but only one functions correctly, leading to issues with UI rendering. The second bug was related to CSS specificity, where custom class selectors overridden the default `[hidden]` attribute's display property, causing three UI issues simultaneously: an empty state appearing incorrectly, and menu elements failing to close properly. AI

IMPACT Highlights potential developer friction points and undocumented behaviors in AI platform SDKs, impacting tool development.

RANK_REASON The item details specific technical bugs encountered while building a tool for an existing platform, rather than a new release or significant industry event.

Read on dev.to — MCP tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Developer finds two undocumented bugs in Claude's MCP Apps

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0 / 100
Composite score across the factors below. Higher = stronger signal that this story matters right now.
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Tool
The item details specific technical bugs encountered while building a tool for an existing platform, rather than a new release or significant industry event.
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Only one publisher covered this so far. Single-source stories can still rank when the publisher is high-authority, but they lack cross-source corroboration.
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product, other
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High
Clearly on-topic for AI-industry coverage.
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96 days old
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Full methodology in our editorial standards.

COVERAGE [1]

  1. dev.to — MCP tag TIER_1 English(EN) · Adeolu Adesina ·

    Two undocumented bugs in MCP Apps I found building a task panel for Claude

    <p>I spent a week building <a href="https://github.com/adeoluwaadesina/wingman-mcp" rel="noopener noreferrer">Wingman</a>, an open source MCP server that renders a persistent task panel inline in Claude conversations using MCP Apps (SEP-1865). The spec is solid. The SDK is solid.…

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