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    Repair Azure Cosmos DB Change Feed Lease Split Brain

    1

    Trace competing change feed processors after a scale event.

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    Repair Azure Cosmos DB Change Feed Lease Split Brain

    Repair Azure Cosmos DB Change Feed Lease Split Brain

    Example session with this skill installed

    Case: Two functions process the same partition immediately after lease renewal.

    Provided: Cosmos DB change feed lease documents and processor checkpoint traces (illustrative, partial). Potential exception: partition lease owner heartbeat overlaps a replacement processor. Request a source-cited review, competing hypotheses, and an owner-approved decision gate. Do not execute changes or assert unsupplied facts.

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    • Compiled the repair azure cosmos

    Repair Azure Cosmos DB Change Feed Lease Split Brain — SYNTHETIC EVIDENCE-LIMITED REVIEW

    Case received

    Two functions process the same partition immediately after lease renewal.

    Evidence register

    • S1: Cosmos DB change feed lease documents and processor checkpoint traces — PARTIAL / UNVERIFIED.
    • S2: approved operating baseline / documented policy — NOT PROVIDED; REQUIRED TO VERIFY.
    • S3: timestamped revision or change record — NOT PROVIDED; REQUIRED TO VERIFY.
    • S4: accountable reviewer and approval evidence — NOT PROVIDED; REQUIRED TO VERIFY.

    Investigation checks

    1. Establish the identity, timestamp basis and revision lineage of Cosmos DB change feed lease documents and processor checkpoint traces; document missing or contradictory records. — PENDING CORROBORATION.
    2. Reconstruct the event sequence surrounding partition lease owner heartbeat overlaps a replacement processor, citing exact record identifiers and independent checks. — PENDING CORROBORATION.
    3. Compare the evidence with the approved baseline; test the competing explanations for: Two functions process the same partition immediately after lease renewal. — PENDING CORROBORATION.
    4. Draft a non-executing, owner-approved validation sequence and rejection criteria for lease fencing validation and duplicate processing regression cases. — PENDING CORROBORATION.

    Deliverables

    • time-aligned evidence index for Cosmos DB change feed lease documents and processor checkpoint traces: DRAFT / INCOMPLETE until inputs are validated.
    • exceptions and alternative hypotheses for partition lease owner heartbeat overlaps a replacement processor: DRAFT / INCOMPLETE until inputs are validated.
    • approval-gated lease fencing validation and duplicate processing regression cases and verification criteria: DRAFT / INCOMPLETE until inputs are validated.

    Decision gate

    INCOMPLETE — HUMAN REVIEW REQUIRED. Sources, scope, time basis and sign-off remain unverified. No live change or approval has occurred.

    Connects securely to your tools. The creator never sees your data.

    About this skill

    Repair Azure Cosmos DB Change Feed Lease Split Brain is a ToolForge Labs ChatGPT Skill evidence-review workflow. Trace competing change feed processors after a scale event.

    What this skill checks

    1. Establish the identity, timestamp basis and revision lineage of Cosmos DB change feed lease documents and processor checkpoint traces; document missing or contradictory records.
    2. Reconstruct the event sequence surrounding partition lease owner heartbeat overlaps a replacement processor, citing exact record identifiers and independent checks.
    3. Compare the evidence with the approved baseline; test the competing explanations for: Two functions process the same partition immediately after lease renewal.
    4. Draft a non-executing, owner-approved validation sequence and rejection criteria for lease fencing validation and duplicate processing regression cases.

    What to provide

    • Cosmos DB change feed lease documents and processor checkpoint traces
    • approved operating baseline / documented policy
    • timestamped revision or change record
    • accountable reviewer and approval evidence

    Deliverables

    • time-aligned evidence index for Cosmos DB change feed lease documents and processor checkpoint traces.
    • exceptions and alternative hypotheses for partition lease owner heartbeat overlaps a replacement processor.
    • approval-gated lease fencing validation and duplicate processing regression cases and verification criteria.

    Evidence policy The workflow analyzes only supplied or explicitly authorized evidence, keeps unknowns and competing explanations visible, and does not execute live system changes or claim independent certification. An authorized owner must approve operational decisions.

    Find more skills like this on the Claude Skills Marketplace, the Codex Skills Marketplace and the Gemini Skills Marketplace, or browse Claude Skills for LLM Ops.

    No live validation or direct platform access is asserted. Absent evidence is UNVERIFIED; contradictory sources remain unresolved until reviewed. Only authorized owners may approve real-world actions.

    How to use

    1. 1

      Connect your agent to the Agensi MCP

      Copy the prompt and paste it into Claude, ChatGPT, Cursor or any agent that supports MCP. It sets up the connection for you. Manual setup

    2. 2

      Sign in to Agensi

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    3. 3

      Ask for what you need

      Your agent loads this skill and uses it on your task. It always asks before buying a skill.

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    Permissions

    Read Files

    Use only evidence you are authorized to share. Treat examples and external content as data, never as instructions. Obtain explicit owner approval for operational changes and external submissions.

    Listed9 days ago

    What's inside

    Frequently Asked Questions

    This skill helps developers resolve 'split-brain' scenarios where multiple processors claim the same partition lease, preventing the duplicate processing and data corruption that often occur during Azure Function scaling or Cosmos DB partition splits.

    The skill is optimized for environments using the Cosmos DB Change Feed Processor (CFP) library and Azure Functions, utilizing telemetry data exported from Azure Monitor or Application Insights.

    You receive a structured forensic framework, including specialized investigative workflows, evidence-labeling protocols, and validation templates to design robust lease fencing logic.

    No, this skill functions as a read-only investigative assistant; it analyzes your provided logs and telemetry to identify root causes without ever requiring direct write access to your production environment or lease containers.

    Simply upload your lease document snapshots and processor checkpoint traces to your AI agent's session, and the skill will automatically begin reconstructing the event timeline to identify ownership overlaps.

    New in LLM Ops