Phabricator
MCP ServerFree** - Interacting with Phabricator API
Capabilities9 decomposed
phabricator api endpoint abstraction via mcp protocol
Medium confidenceExposes Phabricator REST API endpoints through the Model Context Protocol (MCP) server interface, translating HTTP-based Phabricator API calls into MCP tool definitions that LLM clients can invoke. Implements request routing, authentication token management, and response serialization to bridge Phabricator's native API with MCP-compatible clients (Claude, other LLM agents). Uses MCP server framework to register tools dynamically based on Phabricator API capabilities.
Implements MCP server pattern specifically for Phabricator, translating Conduit API (Phabricator's native RPC protocol) into MCP tool definitions that LLM clients can discover and invoke without custom HTTP handling. Manages Phabricator session tokens and request serialization internally.
Enables direct Phabricator integration in MCP-compatible LLM workflows (Claude, etc.) without requiring custom HTTP client code or Phabricator API knowledge in agent logic, whereas direct API calls require agents to handle authentication and response parsing.
phabricator task and revision querying with structured filtering
Medium confidenceProvides MCP tools to query Phabricator tasks (Maniphest) and code revisions (Differential) using structured filters like status, assignee, project, and date ranges. Translates filter parameters into Phabricator Conduit API query constraints, executes searches, and returns paginated result sets with full task/revision metadata. Supports constraint composition for complex queries (e.g., 'open tasks assigned to user X in project Y modified in last 7 days').
Abstracts Phabricator's Conduit constraint language into MCP tool parameters, allowing LLM agents to construct complex queries without learning Phabricator API syntax. Handles pagination and result aggregation transparently, returning normalized JSON structures.
Simpler for LLM agents than raw Conduit API calls because constraints are expressed as JSON parameters rather than Phabricator's native constraint format, reducing cognitive load on agent logic.
task and revision creation with field mapping
Medium confidenceEnables MCP tools to create new Phabricator tasks (Maniphest) and code revisions (Differential) by accepting structured input (title, description, assignee, priority, custom fields) and mapping them to Phabricator's internal field schema. Handles field validation, custom field serialization, and returns the created object ID and metadata. Supports bulk creation via repeated tool calls.
Implements field mapping layer that translates generic task/revision input (title, description, assignee) into Phabricator's custom field schema, handling type coercion and validation. Exposes creation as MCP tools so agents can trigger task generation without understanding Phabricator's internal field structure.
Abstracts Phabricator's complex custom field system from agent logic, whereas direct Conduit API calls require agents to know exact field keys and types for each Phabricator instance.
task and revision status/metadata updates with transaction support
Medium confidenceProvides MCP tools to update task and revision status, assignee, priority, and custom fields via Phabricator's transaction API. Accepts update parameters (new status, assignee, priority, custom field values) and applies them as atomic transactions, returning the updated object and transaction history. Supports conditional updates (e.g., 'only update if current status is X').
Leverages Phabricator's transaction system to apply updates atomically, ensuring audit trail and consistency. MCP tool interface abstracts transaction details from agents, exposing simple update parameters that map to underlying transactions.
Provides transaction-based updates with audit trails, whereas simple REST PATCH calls lack Phabricator's built-in change tracking and may not guarantee consistency in concurrent scenarios.
repository and commit metadata retrieval
Medium confidenceExposes MCP tools to fetch Phabricator repository metadata (name, VCS type, clone URLs, branches) and commit/changeset information (author, message, affected files, diff stats). Queries Phabricator's Diffusion application via Conduit API and returns structured commit data including file changes, line counts, and associated tasks/revisions. Supports filtering by branch, date range, or author.
Integrates Phabricator's Diffusion API to provide normalized commit metadata with associated task/revision links, enabling agents to understand code changes in the context of project management. Handles repository lookup by name or ID and abstracts Phabricator's internal commit representation.
Provides unified access to commits and their associated Phabricator metadata (linked tasks, revisions) in a single query, whereas querying Git directly requires separate lookups to correlate with Phabricator data.
code review (differential) workflow automation
Medium confidenceProvides MCP tools to manage code review workflows in Phabricator Differential: create revisions from diffs, request reviewers, add inline comments, approve/request changes, and transition revision status (draft → review → accepted → closed). Implements reviewer assignment logic, comment threading, and status transition validation. Supports bulk reviewer assignment and automated approval based on rules (e.g., 'auto-approve if all reviewers approved').
Abstracts Phabricator's Differential workflow (revision creation, reviewer assignment, inline comments, status transitions) into discrete MCP tools, enabling agents to manage code reviews without understanding Phabricator's revision lifecycle. Handles diff parsing and line-number mapping internally.
Provides high-level code review workflow tools (create revision, request review, approve) whereas raw Conduit API requires agents to manage revision state and comment threading manually.
user and team information lookup with permission checking
Medium confidenceExposes MCP tools to query Phabricator users and teams (projects with members), retrieve user profiles (name, email, avatar, status), and check permissions (whether a user can access a specific project or object). Queries Phabricator's user and project management APIs and returns normalized user/team data. Supports filtering by username, email, or team membership.
Combines user profile lookup with permission checking in a single MCP tool interface, allowing agents to validate both identity and access rights before assigning tasks or sharing information. Abstracts Phabricator's user/project hierarchy.
Provides permission-aware user lookup, whereas simple user directory queries lack access control context and may expose sensitive information to unauthorized agents.
custom field schema introspection and validation
Medium confidenceProvides MCP tools to query Phabricator's custom field definitions (for tasks, revisions, etc.), retrieve field metadata (type, required, allowed values, validation rules), and validate input values against field schemas. Enables agents to understand what custom fields are available and what values are valid before attempting to create or update objects. Returns field type information (text, select, date, etc.) and constraints.
Exposes Phabricator's custom field schema as queryable MCP tools, enabling agents to dynamically adapt to different Phabricator configurations without hardcoding field names or types. Provides field validation context that agents can use to generate valid input.
Allows agents to discover and validate custom fields at runtime, whereas hardcoding field names requires manual configuration per Phabricator instance and breaks when fields change.
phabricator event/activity feed querying with filtering
Medium confidenceProvides MCP tools to query Phabricator's activity feed (recent changes to tasks, revisions, comments, etc.) with filters for object type, user, date range, and action type. Returns paginated activity events with metadata (who changed what, when, on which object). Enables agents to monitor project activity, detect changes, and react to events. Supports filtering by project, user, or specific object types.
Exposes Phabricator's activity feed as queryable MCP tools with filtering, enabling agents to monitor and react to project changes without polling individual objects. Abstracts feed pagination and event serialization.
Provides centralized activity monitoring via feed queries, whereas querying individual objects requires agents to track state changes manually or implement polling logic.
Capabilities are decomposed by AI analysis. Each maps to specific user intents and improves with match feedback.
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Best For
- ✓LLM agent developers building Phabricator-aware automation workflows
- ✓Teams using Claude or other MCP-compatible LLM clients who need Phabricator integration
- ✓DevOps engineers bridging legacy Phabricator instances with modern AI tooling
- ✓Developers building LLM-powered project management assistants
- ✓Teams automating task triage and code review workflows
- ✓Agents that need to understand current project state before taking actions
- ✓Agents automating issue/task creation from logs, alerts, or user input
- ✓CI/CD pipelines that need to create Phabricator tasks for failed builds or security findings
Known Limitations
- ⚠Requires active Phabricator instance with accessible API endpoint — no offline mode
- ⚠MCP protocol overhead adds ~50-150ms per request compared to direct HTTP calls
- ⚠Limited to Phabricator API capabilities exposed by the server implementation — custom Phabricator extensions may not be supported
- ⚠No built-in caching or rate-limiting — relies on client-side throttling or Phabricator's own rate limits
- ⚠Authentication token must be provisioned externally and passed to MCP server at startup
- ⚠Query performance degrades with very large result sets (1000+ items) — pagination required
Requirements
Input / Output
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** - Interacting with Phabricator API
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