The request asks what to use to manage issue labels. GitHub's indexed action add_labels_to_issue adds labels to an issue while keeping existing ones 11, and Linear's linear_add_label_to_issue adds one label and keeps the others 12. Both are direct fits; the other products either expose only generic label endpoints or do not show issue-label operations in their sources.

1. 1

   GitHubgithub.comverified and signed

   Its add_labels_to_issue action adds labels to an issue and keeps the ones it already has 11, and update_issue can also change an issue's labels 11.

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   official:CLI · github-mcp-serverskill · add-community-extensionskill · git-commitskill · acquire-codebase-knowledge+2,468 community tools built for it

   for agents: add_labels_to_issue · update_issue · github-issues

2. 2

   Linearlinear.appverified and signed

   Its linear_add_label_to_issue action adds one label to an issue and keeps its other labels, and linear_remove_label_from_issue removes one label 12.

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   official:MCP server · LinearSDK · @linear/sdkskill · linear-release-setup+83 community tools built for it

   for agents: linear_add_label_to_issue · linear_remove_label_from_issue · linear_attach_link

3. 3

   Bitbucket APIbitbucket.orgverified and signed

   Its PUT /repositories/{workspace}/{repo_slug}/issues/{issue_id} action updates an issue 13, which can be used to change issue fields.

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   official:API · Bitbucket API+74 community tools built for it

   for agents: POST /repositories/{workspace}/{repo_slug}/refs/tags · POST /repositories/{workspace}/{repo_slug}/issues/{issue_id}/changes · PUT /repositories/{workspace}/{repo_slug}/issues/{issue_id}