Is your feature request related to a problem? Please describe.

This is a first-party proposal from Arcmira. Sim users can connect Arcmira through the generic MCP or API blocks, but there is no native Arcmira block in the current staging registry. A native block could make timestamped YouTube transcript research available through named actions and documented outputs, without hand-authoring HTTP requests or MCP programs.

Describe the solution you'd like

Add an Arcmira integration, displayed as Arcmira: YouTube Transcript Search where the catalog permits descriptive titles, with two initial actions:

• Resolve a person, channel or company name through GET /v1/entities/resolve. Return the resolution options instead of silently choosing an ambiguous name.
• Search spoken transcript passages through GET /v1/search, with a user-controlled result limit and optional documented filters. Preserve timestamped source links, speaker information when available, coverage, partial results and access restrictions.

Use the user's account API key as a user-only configuration input, never a model-supplied argument. Pass credentials in the bearer header. Errors should preserve the API status/code and documentation link, including quota, access and rate-limit failures. The initial block covers entity resolution and indexed search. If expanded to Premium transcript retrieval, paid reads use credits from your plan, then your on-demand budget.

API docs: https://arcmira.com/docs

OpenAPI contract: https://api.arcmira.com/v1/openapi.json

Search guide: https://arcmira.com/docs/search

Authentication and usage: https://arcmira.com/docs/authentication and https://arcmira.com/docs/usage-and-billing

Describe alternatives you've considered

• Existing remote MCP connection: https://mcp.arcmira.com/mcp. It provides broader research and account operations, with its own tool-effect and entitlement rules: https://arcmira.com/docs/mcp-server
• Generic API block against https://api.arcmira.com/v1 with the user's bearer key.
• Separate keyless API-documentation MCP at https://arcmira.com/docs/mcp for developers building integrations. This searches documentation, not video transcripts.

Additional context

Would maintainers prefer a native two-action block or a maintained MCP workflow example? The contribution guide targets staging and requires the tool, block, icon and generated catalog registrations. This proposal seeks agreement on the contribution scope. The local search-and-entity-resolution candidate passed the full repository test suite, repository audits and all-workspace typechecking on October 16, 2026. Both actions also succeeded through the native HTTP routes using an isolated read-only test account, with unchanged account usage. These are dated local results; the candidate still needs a refresh against current staging before contribution. The candidate has not been submitted as a PR or accepted by Sim. Free account API access is available within account allowances, with plan-dependent features and freshness. No credentials or private data are included.