sixta-connect

Explain a deadlock (SIXTA)

sixta_explain_deadlock

Read-onlyIdempotent

Reconstruct a database deadlock from the raw dump — no connection needed. Paste the LATEST DETECTED DEADLOCK section of MySQL's SHOW ENGINE INNODB STATUS, or a PostgreSQL 'deadlock detected' log entry, and get: which transaction held and waited for which lock, the inconsistent lock-ordering that caused the cycle, which transaction was rolled back, and the consistent-ordering / short-transaction / retry fix. Use when the user pastes a deadlock dump or asks 'why did this deadlock'. Input is analyzed in memory and never stored.

Input Schema

TableJSON Schema

Name	Required	Description
`dump`	Yes	The raw deadlock dump — MySQL LATEST DETECTED DEADLOCK section, or a PostgreSQL deadlock log entry
`engine`	No	Database engine: postgresql or mysql. Optional — auto-detected from the dump format.
`version`	No	Engine version, e.g. '16' (PostgreSQL major) or '8.0.35' (MySQL). Omit for a modern default; some verdicts are version-dependent and the assumption is stated in the result.

Output Schema

TableJSON Schema

Name	Required	Description
`engine`	No	Engine the analysis targeted, when known.
`report`	Yes	The full human-readable SIXTA report (markdown).
`findings`	No	Named findings as structured data, when the tool produces them.
`finding_count`	No	Number of findings/issues identified.
`overall_severity`	No	Highest severity across findings (Critical/High/Medium/Low/Info).

Schema Changelog

Changes observed during successful MCP inspections.

First observedJun 28, 2026

TDQS

A4.7/5.0

Behavior5/5

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

Annotations (readOnlyHint, idempotentHint, destructiveHint) are consistent; description adds that input is analyzed in memory and never stored, and details output without contradiction.

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?

Single paragraph with four sentences, front-loads purpose, no fluff.

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

Completeness5/5

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

Given the output schema exists and complexity, description covers what output is provided (lock ordering, rolled-back transaction, fix suggestions), no gaps.

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?

Schema description coverage is 100%, so baseline is 3. Description does not add meaning beyond the schema for any parameter; engine and version are already clearly described in 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 reconstructs a deadlock from a dump, listing specific outputs and distinguishing it from sibling tools like sixta_analyze_query or sixta_detect_n_plus_one.

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?

Explicitly tells when to use ('when the user pastes a deadlock dump or asks 'why did this deadlock'') and what input to provide (MySQL LATEST DETECTED DEADLOCK section or PostgreSQL deadlock log entry).

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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