What problem does it solve? After an AI agent performs actions through GitHub or Linear MCP tools, there is no built-in proof that the action actually happened or complied with policy. This Skill closes that gap by running a verification pass that produces an auditable receipt and an honest PASS, FAIL, or MOCK_ONLY verdict. ## Core Features & Use Cases - Post-action verification: After any GitHub MCP call (PR, issue, comment) or Linear MCP call (issue create/update), invoke verify_run with a receipt or witness object to confirm the action. - Read-only receipt emission: Use emit_receipt_readonly to schema-validate draft receipts without writing anything to local disk. - Honest labeling: Distinguish MOCK_ONLY (local stdio tier, no cloud federation) from PASS and FAIL so claims about shipped work stay accurate. - Use Case: After creating a pull request via GitHub MCP, run the verify chain and reply to the founder with the verdict plus a one-line proof summary before claiming the work is complete. ## Quick Start After the GitHub MCP creates a pull request, run the sourcea-verify verify_run tool with the receipt and report the verdict.