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import { BrowseMergeRequestsSchema, BrowseMrDiscussionsSchema } from "./schema-readonly";
import {
ManageMergeRequestSchema,
ManageMrDiscussionSchema,
ManageDraftNotesSchema,
} from "./schema";
import { gitlab, toQuery } from "../../utils/gitlab-api";
import { normalizeProjectId } from "../../utils/projectIdentifier";
import { ToolRegistry, EnhancedToolDefinition } from "../../types";
import { isActionDenied } from "../../config";
/**
* MRS (Merge Requests) tools registry - 5 CQRS tools replacing 20 individual tools
*
* browse_merge_requests (Query): list, get, diffs, compare
* browse_mr_discussions (Query): list, drafts, draft
* manage_merge_request (Command): create, update, merge
* manage_mr_discussion (Command): comment, thread, reply, update, apply_suggestion, apply_suggestions
* manage_draft_notes (Command): create, update, publish, publish_all, delete
*/
export const mrsToolRegistry: ToolRegistry = new Map<string, EnhancedToolDefinition>([
// ============================================================================
// browse_merge_requests - CQRS Query Tool (discriminated union schema)
// TypeScript automatically narrows types in each switch case
// ============================================================================
[
"browse_merge_requests",
{
name: "browse_merge_requests",
description:
'BROWSE merge requests. Actions: "list" shows MRs with filtering, "get" retrieves single MR by IID or branch, "diffs" shows file changes, "compare" diffs two branches/commits.',
inputSchema: z.toJSONSchema(BrowseMergeRequestsSchema),
gate: { envVar: "USE_MRS", defaultValue: true },
handler: async (args: unknown) => {
const input = BrowseMergeRequestsSchema.parse(args);
// Runtime validation: reject denied actions even if they bypass schema filtering
Iif (isActionDenied("browse_merge_requests", input.action)) {
throw new Error(`Action '${input.action}' is not allowed for browse_merge_requests tool`);
}
switch (input.action) {
case "list": {
// TypeScript knows: input has state, order_by, sort, milestone, etc. (all optional)
const { action: _action, project_id, ...rest } = input;
const query = toQuery(rest, []);
const path = project_id
? `projects/${normalizeProjectId(project_id)}/merge_requests`
: `merge_requests`;
return gitlab.get(path, { query });
}
case "get": {
// TypeScript knows: input has project_id (required), merge_request_iid (optional), branch_name (optional)
const { project_id, merge_request_iid, branch_name } = input;
// Build query params for optional fields
const query: Record<string, boolean | string | undefined> = {};
if (input.include_diverged_commits_count !== undefined)
query.include_diverged_commits_count = input.include_diverged_commits_count;
if (input.include_rebase_in_progress !== undefined)
query.include_rebase_in_progress = input.include_rebase_in_progress;
if (merge_request_iid) {
return gitlab.get(
`projects/${normalizeProjectId(project_id)}/merge_requests/${merge_request_iid}`,
Object.keys(query).length > 0 ? { query } : undefined
);
} else Eif (branch_name) {
const result = await gitlab.get<unknown[]>(
`projects/${normalizeProjectId(project_id)}/merge_requests`,
{ query: { source_branch: branch_name, ...query } }
);
if (Array.isArray(result) && result.length > 0) {
return result[0];
}
throw new Error("No merge request found for branch");
}
/* istanbul ignore next -- unreachable: schema validation ensures merge_request_iid or branch_name */
throw new Error("Either merge_request_iid or branch_name must be provided");
}
case "diffs": {
// TypeScript knows: input has project_id (required), merge_request_iid (required)
const { project_id, merge_request_iid } = input;
const query: Record<string, number | boolean | undefined> = {};
if (input.page !== undefined) query.page = input.page;
if (input.per_page !== undefined) query.per_page = input.per_page;
if (input.include_diverged_commits_count !== undefined)
query.include_diverged_commits_count = input.include_diverged_commits_count;
if (input.include_rebase_in_progress !== undefined)
query.include_rebase_in_progress = input.include_rebase_in_progress;
return gitlab.get(
`projects/${normalizeProjectId(project_id)}/merge_requests/${merge_request_iid}/changes`,
{ query }
);
}
case "compare": {
// TypeScript knows: input has project_id (required), from (required), to (required)
const { project_id, from, to, straight } = input;
const query: Record<string, string | boolean | undefined> = {
from,
to,
};
if (straight !== undefined) query.straight = straight;
return gitlab.get(`projects/${normalizeProjectId(project_id)}/repository/compare`, {
query,
});
}
/* istanbul ignore next -- unreachable with Zod discriminatedUnion */
default:
throw new Error(`Unknown action: ${(input as { action: string }).action}`);
}
},
},
],
// ============================================================================
// browse_mr_discussions - CQRS Query Tool (discriminated union schema)
// TypeScript automatically narrows types in each switch case
// ============================================================================
[
"browse_mr_discussions",
{
name: "browse_mr_discussions",
description:
'BROWSE MR discussions and draft notes. Actions: "list" shows all discussion threads, "drafts" lists unpublished draft notes, "draft" gets single draft note.',
inputSchema: z.toJSONSchema(BrowseMrDiscussionsSchema),
gate: { envVar: "USE_MRS", defaultValue: true },
handler: async (args: unknown) => {
const input = BrowseMrDiscussionsSchema.parse(args);
// Runtime validation: reject denied actions even if they bypass schema filtering
Iif (isActionDenied("browse_mr_discussions", input.action)) {
throw new Error(`Action '${input.action}' is not allowed for browse_mr_discussions tool`);
}
switch (input.action) {
case "list": {
// TypeScript knows: input has project_id (required), merge_request_iid (required), per_page, page (optional)
const { action: _action, project_id, merge_request_iid, ...rest } = input;
const query = toQuery(rest, []);
return gitlab.get(
`projects/${normalizeProjectId(project_id)}/merge_requests/${merge_request_iid}/discussions`,
{ query }
);
}
case "drafts": {
// TypeScript knows: input has project_id (required), merge_request_iid (required)
const { project_id, merge_request_iid } = input;
return gitlab.get(
`projects/${normalizeProjectId(project_id)}/merge_requests/${merge_request_iid}/draft_notes`
);
}
case "draft": {
// TypeScript knows: input has project_id (required), merge_request_iid (required), draft_note_id (required)
const { project_id, merge_request_iid, draft_note_id } = input;
return gitlab.get(
`projects/${normalizeProjectId(project_id)}/merge_requests/${merge_request_iid}/draft_notes/${draft_note_id}`
);
}
/* istanbul ignore next -- unreachable with Zod discriminatedUnion */
default:
throw new Error(`Unknown action: ${(input as { action: string }).action}`);
}
},
},
],
// ============================================================================
// manage_merge_request - CQRS Command Tool (discriminated union schema)
// TypeScript automatically narrows types in each switch case
// ============================================================================
[
"manage_merge_request",
{
name: "manage_merge_request",
description:
'MANAGE merge requests. Actions: "create" creates new MR, "update" modifies existing MR, "merge" merges approved MR into target branch.',
inputSchema: z.toJSONSchema(ManageMergeRequestSchema),
gate: { envVar: "USE_MRS", defaultValue: true },
handler: async (args: unknown) => {
const input = ManageMergeRequestSchema.parse(args);
// Runtime validation: reject denied actions even if they bypass schema filtering
Iif (isActionDenied("manage_merge_request", input.action)) {
throw new Error(`Action '${input.action}' is not allowed for manage_merge_request tool`);
}
switch (input.action) {
case "create": {
// TypeScript knows: input has source_branch (required), target_branch (required), title (required)
const { action: _action, project_id, ...body } = input;
// Handle array fields - convert to comma-separated strings for form encoding
const processedBody: Record<string, unknown> = {};
for (const [key, value] of Object.entries(body)) {
if (Array.isArray(value)) {
processedBody[key] = value.join(",");
} else {
processedBody[key] = value;
}
}
return gitlab.post(`projects/${normalizeProjectId(project_id)}/merge_requests`, {
body: processedBody,
contentType: "form",
});
}
case "update": {
// TypeScript knows: input has merge_request_iid (required)
const { action: _action, project_id, merge_request_iid, ...body } = input;
// Handle array fields
const processedBody: Record<string, unknown> = {};
for (const [key, value] of Object.entries(body)) {
if (Array.isArray(value)) {
processedBody[key] = value.join(",");
} else {
processedBody[key] = value;
}
}
return gitlab.put(
`projects/${normalizeProjectId(project_id)}/merge_requests/${merge_request_iid}`,
{ body: processedBody, contentType: "form" }
);
}
case "merge": {
// TypeScript knows: input has merge_request_iid (required)
const { action: _action, project_id, merge_request_iid, ...body } = input;
return gitlab.put(
`projects/${normalizeProjectId(project_id)}/merge_requests/${merge_request_iid}/merge`,
{ body, contentType: "form" }
);
}
/* istanbul ignore next -- unreachable with Zod discriminatedUnion */
default:
throw new Error(`Unknown action: ${(input as { action: string }).action}`);
}
},
},
],
// ============================================================================
// manage_mr_discussion - CQRS Command Tool (discriminated union schema)
// TypeScript automatically narrows types in each switch case
// ============================================================================
[
"manage_mr_discussion",
{
name: "manage_mr_discussion",
description:
'MANAGE MR discussions and suggestions. Actions: "comment" adds comment, "thread" starts discussion, "reply" responds to thread, "update" modifies note, "apply_suggestion" applies single code suggestion, "apply_suggestions" batch applies multiple suggestions.',
inputSchema: z.toJSONSchema(ManageMrDiscussionSchema),
gate: { envVar: "USE_MRS", defaultValue: true },
handler: async (args: unknown) => {
const input = ManageMrDiscussionSchema.parse(args);
// Runtime validation: reject denied actions even if they bypass schema filtering
Iif (isActionDenied("manage_mr_discussion", input.action)) {
throw new Error(`Action '${input.action}' is not allowed for manage_mr_discussion tool`);
}
switch (input.action) {
case "comment": {
// TypeScript knows: input has noteable_type (required), noteable_id (required), body (required)
const {
project_id,
noteable_type,
noteable_id,
body: noteBody,
created_at,
confidential,
} = input;
const body: Record<string, unknown> = { body: noteBody };
Iif (created_at) body.created_at = created_at;
Iif (confidential !== undefined) body.confidential = confidential;
const resourceType = noteable_type === "merge_request" ? "merge_requests" : "issues";
return gitlab.post(
`projects/${normalizeProjectId(project_id)}/${resourceType}/${noteable_id}/notes`,
{ body, contentType: "form" }
);
}
case "thread": {
// TypeScript knows: input has merge_request_iid (required), body (required)
const { project_id, merge_request_iid, body: noteBody, position, commit_id } = input;
const body: Record<string, unknown> = { body: noteBody };
Iif (position) body.position = JSON.stringify(position);
Iif (commit_id) body.commit_id = commit_id;
return gitlab.post(
`projects/${normalizeProjectId(project_id)}/merge_requests/${merge_request_iid}/discussions`,
{ body, contentType: "form" }
);
}
case "reply": {
// TypeScript knows: input has merge_request_iid (required), discussion_id (required), body (required)
const {
project_id,
merge_request_iid,
discussion_id,
body: noteBody,
created_at,
} = input;
const body: Record<string, unknown> = { body: noteBody };
Iif (created_at) body.created_at = created_at;
return gitlab.post(
`projects/${normalizeProjectId(project_id)}/merge_requests/${merge_request_iid}/discussions/${discussion_id}/notes`,
{ body, contentType: "form" }
);
}
case "update": {
// TypeScript knows: input has merge_request_iid (required), note_id (required), body (required)
const { project_id, merge_request_iid, note_id, body: noteBody } = input;
return gitlab.put(
`projects/${normalizeProjectId(project_id)}/merge_requests/${merge_request_iid}/notes/${note_id}`,
{ body: { body: noteBody }, contentType: "form" }
);
}
case "apply_suggestion": {
// TypeScript knows: input has suggestion_id (required), commit_message (optional)
const { project_id, merge_request_iid, suggestion_id, commit_message } = input;
const body: Record<string, unknown> = {};
if (commit_message) {
body.commit_message = commit_message;
}
return gitlab.put(
`projects/${normalizeProjectId(project_id)}/merge_requests/${merge_request_iid}/suggestions/${suggestion_id}/apply`,
{ body: Object.keys(body).length > 0 ? body : undefined, contentType: "json" }
);
}
case "apply_suggestions": {
// TypeScript knows: input has suggestion_ids (required), commit_message (optional)
const { project_id, merge_request_iid, suggestion_ids, commit_message } = input;
const body: Record<string, unknown> = {
ids: suggestion_ids,
};
if (commit_message) {
body.commit_message = commit_message;
}
return gitlab.put(
`projects/${normalizeProjectId(project_id)}/merge_requests/${merge_request_iid}/suggestions/batch_apply`,
{ body, contentType: "json" }
);
}
/* istanbul ignore next -- unreachable with Zod discriminatedUnion */
default:
throw new Error(`Unknown action: ${(input as { action: string }).action}`);
}
},
},
],
// ============================================================================
// manage_draft_notes - CQRS Command Tool (discriminated union schema)
// TypeScript automatically narrows types in each switch case
// ============================================================================
[
"manage_draft_notes",
{
name: "manage_draft_notes",
description:
'MANAGE draft notes. Actions: "create" creates draft note, "update" modifies draft, "publish" publishes single draft, "publish_all" publishes all drafts, "delete" removes draft.',
inputSchema: z.toJSONSchema(ManageDraftNotesSchema),
gate: { envVar: "USE_MRS", defaultValue: true },
handler: async (args: unknown) => {
const input = ManageDraftNotesSchema.parse(args);
// Runtime validation: reject denied actions even if they bypass schema filtering
Iif (isActionDenied("manage_draft_notes", input.action)) {
throw new Error(`Action '${input.action}' is not allowed for manage_draft_notes tool`);
}
switch (input.action) {
case "create": {
// TypeScript knows: input has note (required), position, in_reply_to_discussion_id, commit_id (optional)
const {
project_id,
merge_request_iid,
note,
position,
in_reply_to_discussion_id,
commit_id,
} = input;
const body: Record<string, unknown> = { note };
Iif (position) body.position = JSON.stringify(position);
if (in_reply_to_discussion_id)
body.in_reply_to_discussion_id = in_reply_to_discussion_id;
Iif (commit_id) body.commit_id = commit_id;
return gitlab.post(
`projects/${normalizeProjectId(project_id)}/merge_requests/${merge_request_iid}/draft_notes`,
{ body, contentType: "form" }
);
}
case "update": {
// TypeScript knows: input has draft_note_id (required), note (required)
const { project_id, merge_request_iid, draft_note_id, note, position } = input;
const body: Record<string, unknown> = { note };
Iif (position) body.position = JSON.stringify(position);
return gitlab.put(
`projects/${normalizeProjectId(project_id)}/merge_requests/${merge_request_iid}/draft_notes/${draft_note_id}`,
{ body, contentType: "form" }
);
}
case "publish": {
// TypeScript knows: input has draft_note_id (required)
const { project_id, merge_request_iid, draft_note_id } = input;
const result = await gitlab.put<void>(
`projects/${normalizeProjectId(project_id)}/merge_requests/${merge_request_iid}/draft_notes/${draft_note_id}/publish`
);
// PUT publish returns 204 No Content (undefined) on success
return result ?? { published: true };
}
case "publish_all": {
// TypeScript knows: input has project_id (required), merge_request_iid (required)
const { project_id, merge_request_iid } = input;
const result = await gitlab.post<void>(
`projects/${normalizeProjectId(project_id)}/merge_requests/${merge_request_iid}/draft_notes/bulk_publish`
);
// POST bulk_publish returns 204 No Content (undefined) on success
return result ?? { published: true };
}
case "delete": {
// TypeScript knows: input has draft_note_id (required)
const { project_id, merge_request_iid, draft_note_id } = input;
await gitlab.delete<void>(
`projects/${normalizeProjectId(project_id)}/merge_requests/${merge_request_iid}/draft_notes/${draft_note_id}`
);
return { success: true, message: "Draft note deleted successfully" };
}
/* istanbul ignore next -- unreachable with Zod discriminatedUnion */
default:
throw new Error(`Unknown action: ${(input as { action: string }).action}`);
}
},
},
],
]);
/**
* Get read-only tool names from the registry
*/
export function getMrsReadOnlyToolNames(): string[] {
return ["browse_merge_requests", "browse_mr_discussions"];
}
/**
* Get all tool definitions from the registry
*/
export function getMrsToolDefinitions(): EnhancedToolDefinition[] {
return Array.from(mrsToolRegistry.values());
}
/**
* Get filtered tools based on read-only mode
*/
export function getFilteredMrsTools(readOnlyMode: boolean = false): EnhancedToolDefinition[] {
if (readOnlyMode) {
const readOnlyNames = getMrsReadOnlyToolNames();
return Array.from(mrsToolRegistry.values()).filter(tool => readOnlyNames.includes(tool.name));
}
return getMrsToolDefinitions();
}
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