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magento_find_event_dispatchers

Locate PHP files where a Magento event is dispatched via eventManager->dispatch(). Determines which class triggers the event.

Instructions

Find all PHP locations where a specific Magento event is dispatched via eventManager->dispatch(). Unlike magento_find_event_flow (which shows the full chain: dispatchers+observers+handlers), this tool focuses exclusively on finding WHERE an event is triggered — with exact grep matching, method context, and surrounding code. Use this to answer "does class X dispatch event Y?" or "who triggers this event?".

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
eventNameYesMagento event name to find dispatchers for. Examples: "sales_order_place_after", "custom_discount_rule_validation_before", "checkout_cart_add_product_complete"
Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations are provided, so the description must fully disclose behavior. It states the method (grep matching, method context, surrounding code) and implies read-only operation. However, it does not mention any side effects or auth requirements, but the behavior is straightforward.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is concise (two sentences), front-loaded with the main action, and contains no unnecessary words, efficiently conveying purpose and use.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the simple parameter (1 required, fully described) and no output schema, the description is nearly complete. It covers purpose, use cases, and technique, though it could explicitly mention the output format (e.g., file paths with code snippets).

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The input schema already provides a description with examples for eventName (100% coverage). The description adds context about the tool's purpose and technique but does not significantly enhance the parameter's meaning beyond the schema.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool finds PHP locations where a Magento event is dispatched via eventManager->dispatch(), and distinguishes itself from the sibling magento_find_event_flow by focusing on the trigger location rather than the full chain.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Explicit use cases are provided: 'does class X dispatch event Y?' and 'who triggers this event?', along with a direct comparison to magento_find_event_flow, guiding the agent on when to use this tool over alternatives.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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