OpenAccountants

Read a tax Guide

get_skill

Read-onlyIdempotent

Open a Guide by slug (from start, search_skills or search_rules) to answer the user's question. Returns the Guide's rules and method, its quality tier, the named accountant where one reviewed it, a section_index of sections not inlined, and a provenance footer to keep with the answer.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`slug`	Yes	Skill slug, e.g. 'us-schedule-c-and-se-computation'
`reason`	No	One sentence on WHY you're making this call, in the user's terms (for routing analysis only). Optional.

Output Schema

TableJSON Schema

Name	Required	Description
`skill`	Yes	The skill record (slug, name, jurisdiction, tier, etc.)
`key_facts`	No	Optional at-a-glance facts (rates/thresholds/deadlines/verifier/advisory) — present only where the skill carries a structured key_facts block; omitted otherwise.
`guardrails`	No
`provenance`	Yes
`written_by`	No	The accountant who wrote this Guide ({name, profile_url}), when it is accountant-authored; null otherwise.
`next_action`	No
`verification`	No	Verification summary
`section_index`	No	Every section of the skill with {index, heading, level, chars, priority, included}. For any section with included:false, fetch it via get_skill_sections({slug, section_index}).
`current_version`	No	Current version. markdown_content holds the compute-core (rates, box maps, rules, worksheet contract); bulky reference sections may be omitted — see section_index.

Schema Changelog

Changes observed during successful MCP inspections.

Changed2 schema fields changedOct 3, 2026

changedOutput schema / properties / provenance / properties / tier / enum

Previous value: -[
-  "accountant-verified",
-  "research-verified"
-]New value: +[
+  "accountant-verified",
+  "accountant-authored",
+  "research-verified"
+]

addedOutput schema / properties / written_by

Added value: +{
+  "description": "The accountant who wrote this Guide ({name, profile_url}), when it is accountant-authored; null otherwise.",
+  "type": [
+    "object",
+    "null"
+  ]
+}

Changed1 schema field changedJul 13, 2026

addedInput schema / properties / reason

Added value: +{
+  "description": "One sentence on WHY you're making this call, in the user's terms (for routing analysis only). Optional.",
+  "type": "string"
+}

Changed1 schema field changedJun 18, 2026

addedOutput schema / properties / provenance / properties / last_verified_at

Added value: +{
+  "description": "When the skill's facts were last verified (decay signal), or null if never.",
+  "type": [
+    "string",
+    "null"
+  ]
+}

Changed2 schema fields changedJun 2, 2026
- addedOutput schema / properties / guardrails
```
Added value: +{
+  "items": {
+    "type": "string"
+  },
+  "type": "array"
+}
```
- addedOutput schema / properties / next_action
```
Added value: +{
+  "type": "string"
+}
```

Changed2 schema fields changedJun 2, 2026

changedOutput schema / properties / current_version / description

Previous value: -"Current version incl. markdown_content"New value: +"Current version. markdown_content holds the compute-core (rates, box maps, rules, worksheet contract); bulky reference sections may be omitted — see section_index."

addedOutput schema / properties / section_index

Added value: +{
+  "description": "Every section of the skill with {index, heading, level, chars, priority, included}. For any section with included:false, fetch it via get_skill_sections({slug, section_index}).",
+  "items": {
+    "type": "object"
+  },
+  "type": "array"
+}

Changed1 schema field changedJun 2, 2026

addedOutput schema / properties / key_facts

Added value: +{
+  "description": "Optional at-a-glance facts (rates/thresholds/deadlines/verifier/advisory) — present only where the skill carries a structured key_facts block; omitted otherwise.",
+  "type": "object"
+}

Changed1 schema field changedMay 24, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "properties": {
+    "current_version": {
+      "description": "Current version incl. markdown_content",
+      "type": [
+        "object",
+        "null"
+      ]
+    },
+    "provenance": {
+      "properties": {
+        "attribution_required": {
+          "type": "boolean"
+        },
+        "source_url": {
+          "type": "string"
+        },
+        "tier": {
+          "enum": [
+            "accountant-verified",
+            "research-verified"
+          ],
+          "type": "string"
+        }
+      },
+      "type": "object"
+    },
+    "skill": {
+      "description": "The skill record (slug, name, jurisdiction, tier, etc.)",
+      "type": "object"
+    },
+    "verification": {
+      "description": "Verification summary",
+      "type": [
+        "object",
+        "null"
+      ]
+    }
+  },
+  "required": [
+    "skill",
+    "provenance"
+  ],
+  "type": "object"
+}

First observedMay 20, 2026

TDQS

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