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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Add addBlockedBy / removeBlockedBy mutations (native issue dependencies) to MCP server","articleBody":"## Summary\n\nGitHub's native issue-dependencies API (GA Aug 2025) exposes `addBlockedBy` / `removeBlockedBy` GraphQL mutations to set/unset hard-block edges between issues: https://github.blog/changelog/2025-08-21-dependencies-on-issues/\n\nThe MCP server currently exposes:\n- `sub_issue_write` — parent/child sub-issue relationships\n- `issue_write` — issue CRUD\n\nIt does NOT expose the `blockedBy` / `blocking` mutation pair, and there is no generic GraphQL passthrough that would let a client invoke them.\n\n## Impact\n\nClients restricted to MCP (e.g., Claude Code's web sandbox) cannot set `blockedBy` edges, while clients with raw `gh api graphql` access can. The same agent acting from a CLI session can write the edge; from the web sandbox, it cannot. Any \"agent, file this issue and link it as blockedBy #N\" workflow has to be punted to a CLI session.\n\n## Use case\n\nA personal-knowledge-base repo (https://github.com/karyandrew/second-brain) uses native issue dependencies as the canonical edge model for a work-tracking DAG. The agent's \"ready set\" query depends on `issueDependenciesSummary.blockedBy == 0`. Web-sandbox sessions can read the edges but not write them.\n\n## Asks (any one closes)\n\n1. Add `addBlockedBy` / `removeBlockedBy` to the MCP server, paralleling the existing `sub_issue_write` shape.\n2. Add a generic GraphQL passthrough (e.g., `graphql_query`) so clients can invoke arbitrary mutations against authenticated repos.\n\n## Verified upstream\n\nFrom a `gh api graphql` shell:\n\n```\ngh api graphql -f query='mutation { addBlockedBy(input: {issueId: \"...\", blockingIssueId: \"...\"}) { issue { number issueDependenciesSummary { blockedBy } } } }'\n```\n\nWorks. Pure tool-surface gap.","author":{"url":"https://github.com/karyandrew","@type":"Person","name":"karyandrew"},"datePublished":"2026-04-27T03:19:55.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/2391/github-mcp-server/issues/2391"}