sonar-duplication

# SonarQube — Duplication List files that contain duplicated code in a SonarQube project, then drill into **duplication blocks** for a specific file when needed. ## Usage ``` sonar-duplication # all duplicated files in the current project (auto-paginated) sonar-duplication my-project # duplicated files in a specific project sonar-duplication my-project --pr 42 # same, on a pull request sonar-duplication my-project --page-size 100 --page 2 # single page of results (manual pagination) sonar-duplication my-project --file src/auth/login.py # duplication detail for one file ``` ## Prerequisites This skill requires the SonarQube MCP Server to be configured and the tools `mcp__sonarqube__search_duplicated_files` and `mcp__sonarqube__get_duplications` to be available in your session. If a tool fails due to authentication problems, ask the user to ensure they have given their consent for automatic token exchange through SonarQube Cloud > My Account > Access Tokens > Agent Apps. Otherwise surface the tool error verbatim and stop. ## Instructions ### Step 1: Resolve the project key (only when needed) MCP tools sometimes **do not require** `projectKey` when the SonarQube MCP Server has a default project for this workspace (e.g. `SONARQUBE_PROJECT_KEY` configured in the server env). Resolve a key only when you must pass it (tool schema requires it, or the user targets another project): - If the user provided a project key, use it. - Otherwise look for `sonar.projectKey` in `sonar-project.properties` at the repo root. - If still not found, **omit `projectKey`** in MCP calls and rely on the integration default. ### Step 2: Parse optional flags from the user-provided arguments | Flag | Meaning | | ----------------- | ------------------------------------------------------------------------------------------------------------ | | `--pr <id>` | Pull request context (maps to `pullRequest`) | | `--page-size <n>` | Results per page for **manual** pagination only; integer 1–500 (maps to `pageSize`) | | `--page <n>` | Page number for **manual** pagination; starts at **1** (maps to `pageIndex`) | | `--file <key>` | Skip the duplicated-files list; fetch duplication blocks for this file (maps to `key` in `get_duplications`) | **Pagination rule:** By default, call `search_duplicated_files` **without** `pageSize` or `pageIndex` so the MCP server auto-fetches every page of duplicated files (up to **10,000** files). Use `pageSize` and `pageIndex` only when the user asks for a specific page or wants to limit page size. If the user supplies `--page-size` but not `--page`, use `pageIndex` **1**. ### Step 3: Run the appropriate flow #### Flow A — Duplicated file list (default, no `--file`) Call `mcp__sonarqube__search_duplicated_files`. **Default (auto-fetch all pages):** Include **`projectKey` only if** you resolved one in Step 1 **and** the tool requires it; otherwise omit it. ```json { "projectKey": "<only-if-required>", "pullRequest": "<id>" } ``` Omit `pullRequest` when `--pr` was not given. Omit `pageSize` and `pageIndex` entirely so all duplicated files are retrieved automatically. Omit `projectKey` from the payload when the integration default applies. **Manual pagination (single page):** ```json { "projectKey": "<only-if-required>", "pullRequest": "<id>", "pageSize": <n>, "pageIndex": <n> } ``` The tool returns **only files that have duplications**. Present results in a table. Include columns the response provides (for example path, duplicated line counts, or density); sort by the strongest duplication signal if multiple metrics exist (for example highest duplicated-lines density or count first). ```markdown ## Duplication — `my-project` Files with duplications: | File | Duplicated lines (example) | | -------------------- | -------------------------- | | src/auth/login.py | 42 | | src/utils/helpers.py | 18 | ``` If the list is empty: *"No duplicated files were returned for this project/branch/PR."* Then offer to drill in: *"Ask me to open duplications for any file, or invoke the sonar-duplication skill with `--file <file-key>` (add a project key only if needed)."* #### Flow B — Duplication detail (`--file <key>` given, or user asks to inspect a file) Call `mcp__sonarqube__get_duplications`: ```json { "key": "<file-key>", "pullRequest": "<id>" } ``` The file key format is `<projectKey>:<path>`, e.g. `my-project:src/auth/login.py`. If the user provides just a path, prepend the resolved project key when you have one; otherwise follow the MCP tool schema for the default project. Omit `pullRequest` when `--pr` was not given. > **Permission:** This call requires **Browse** permission on the file’s project. If the tool returns a permission or authorization error, tell the user they need the **Browse** role on the project and that they may need a role with code-view access. Present duplication **blocks** from the response: for each block, show ranges, sibling copies, or other fields returned by the API so the user can see where code is duplicated. ```markdown ## Duplication detail — `src/auth/login.py` ### Block 1 - Lines 10–24 (example) duplicated in `src/other/helper.py` lines 30–44 ... ``` If the file has no duplications in the response, say: *"No duplications were reported for this file."* ### Step 4: Next steps - To refactor: *"Ask me to extract a shared helper or consolidate the duplicated regions."* - To check the quality gate (e.g. `new_duplicated_lines_density`): *"Invoke the sonar-quality-gate skill (add a project key only if you are not using the integration default)."*