aziel-runtime

Advanced: last session receipt

runtime_session_receipt

Read-onlyIdempotent

[advanced/internal] Read the last receipt only for a raw session — not the full chain. Use this when the user asked for the latest receipt on an open or sealed session.

Instructions

[advanced/internal] Read the last receipt only for a raw session — not the full chain. Use this when the user asked for the latest receipt on an open or sealed session. Do not use it for the full receipt chain or product output the user did not ask to audit; use runtime_session_receipts (full chain) or the product display from fraggate_call instead. Does not mutate the session. Unknown id returns session_not_found. An empty receipt list returns receipt=null rather than inventing one. Prefer product output (display) unless the user asked for the chain. session_id or id (aliases) required. No view/limit — this is always the last receipt plus a chain verified flag. Returns the last receipt object (or null) and verified.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`id`	No	Alias of session_id. The door accepts either key; do not send two different values.
`session_id`	Yes	Required. Raw session id from runtime_session_open (sess_ + 32 lowercase hex). Alias: id. Missing both fails with session_id required; unknown id returns session_not_found.

Output Schema

TableJSON Schema

Name	Required	Description
`code`	No	FragGate or fabric code when present: FG-OK, FG-HALLUC-TOOL, FG-STUB, FG-LOCAL-ONLY, FG-UNKNOWN-OP, FG-GATE-REFUSE, FG-LAMB-REFUSE, or a module refuse such as MESH-* / AKM-*.
`door`	No	Door name. The public door is fraggate.
`ran_in`	No	Execution locale (for example aziel-runtime) when present.
`result`	No	Last-receipt body: receipt (or null), verified chain flag, public session. Errors: session_id required, session_not_found.
`status`	No	HTTP-like status when present on wrappers (200 ok; 400+ error / refuse).
`display`	No	Human-facing envelope. Show title and summary, then take the next input.
`receipt`	No	Optional receipt, ledger tip, or TemporalLock/ForgeReceipts exit when the door stamped one.
`refusal`	No	Explicit refuse object, code, or message when the door or engine refused.
`engine_op`	No	Resolved engine op when present (often inside result).
`ledger_tip`	No	Ask/refuse ledger tip when the door stamped one.
`provenance`	No	Provenance / input packet when the pipeline attached one.
`session_id`	No	Raw session id when session plumbing was used. Hidden unless the user asked for the chain.
`engine_slug`	No	Resolved engine slug when present (often inside result).
`limitations`	No	Capability limitations or Remain-OFF notes when present.
`engine_digest`	No	64-hex engine_digest when a true in-process engine ran (often inside result).

Schema Changelog

Changes observed during successful MCP inspections.

Changed5 schema fields changedv2.0.1Sep 14, 2026

changedInput schema / description

Previous value: -"session_id is required."New value: +"session_id or id required. Extra keys are ignored."

addedInput schema / properties / id

Added value: +{
+  "description": "Alias of session_id. The door accepts either key; do not send two different values.",
+  "pattern": "^sess_[a-f0-9]{32}$",
+  "type": "string"
+}

changedInput schema / properties / session_id / description

Previous value: -"Required session id whose last receipt to read. Alias: id."New value: +"Required. Raw session id from runtime_session_open (sess_ + 32 lowercase hex). Alias: id. Missing both fails with session_id required; unknown id returns session_not_found."

addedInput schema / properties / session_id / pattern
```
Added value: +"^sess_[a-f0-9]{32}$"
```

changedOutput schema / properties / result / description

Previous value: -"Machine payload. FragGate-style results commonly include ok, code, slug, op, status, engine_slug, engine_op, engine_digest, ran_in, provenance, refusal, limitations, and ledger_tip."New value: +"Last-receipt body: receipt (or null), verified chain flag, public session. Errors: session_id required, session_not_found."

Changed3 schema fields changedv1.6.2Sep 12, 2026

addedInput schema / description
```
Added value: +"session_id is required."
```

addedInput schema / properties / session_id / description

Added value: +"Required session id whose last receipt to read. Alias: id."

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "additionalProperties": true,
+  "description": "Display envelope shown to the user (display.title / display.summary) plus the machine result. Extra engine fields may appear.",
+  "properties": {
+    "code": {
+      "description": "FragGate or fabric code when present: FG-OK, FG-HALLUC-TOOL, FG-STUB, FG-LOCAL-ONLY, FG-UNKNOWN-OP, FG-GATE-REFUSE, FG-LAMB-REFUSE, or a module refuse such as MESH-* / AKM-*.",
+      "type": "string"
+    },
+    "display": {
+      "additionalProperties": true,
+      "description": "Human-facing envelope. Show title and summary, then take the next input.",
+      "properties": {
+        "fields": {
+          "description": "Optional labeled scalars copied from the result for display.",
+          "items": {
+            "additionalProperties": true,
+            "properties": {
+              "label": {
+                "description": "Field label.",
+                "type": "string"
+              },
+              "value": {
+                "description": "Field value as text.",
+                "type": "string"
+              }
+            },
+            "type": "object"
+          },
+          "type": "array"
+        },
+        "next": {
+          "description": "What the agent should do after showing this output.",
+          "type": "string"
+        },
+        "summary": {
+          "description": "One-line outcome or refuse reason.",
+          "type": "string"
+        },
+        "title": {
+          "description": "Short result title for the AI client.",
+          "type": "string"
+        }
+      },
+      "type": "object"
+    },
+    "door": {
+      "description": "Door name. The public door is fraggate.",
+      "type": "string"
+    },
+    "engine_digest": {
+      "description": "64-hex engine_digest when a true in-process engine ran (often inside result).",
+      "type": "string"
+    },
+    "engine_op": {
+      "description": "Resolved engine op when present (often inside result).",
+      "type": "string"
+    },
+    "engine_slug": {
+      "description": "Resolved engine slug when present (often inside result).",
+      "type": "string"
+    },
+    "ledger_tip": {
+      "description": "Ask/refuse ledger tip when the door stamped one."
+    },
+    "limitations": {
+      "description": "Capability limitations or Remain-OFF notes when present."
+    },
+    "provenance": {
+      "description": "Provenance / input packet when the pipeline attached one."
+    },
+    "ran_in": {
+      "description": "Execution locale (for example aziel-runtime) when present.",
+      "type": "string"
+    },
+    "receipt": {
+      "description": "Optional receipt, ledger tip, or TemporalLock/ForgeReceipts exit when the door stamped one."
+    },
+    "refusal": {
+      "description": "Explicit refuse object, code, or message when the door or engine refused."
+    },
+    "result": {
+      "description": "Machine payload. FragGate-style results commonly include ok, code, slug, op, status, engine_slug, engine_op, engine_digest, ran_in, provenance, refusal, limitations, and ledger_tip."
+    },
+    "session_id": {
+      "description": "Raw session id when session plumbing was used. Hidden unless the user asked for the chain.",
+      "type": "string"
+    },
+    "status": {
+      "description": "HTTP-like status when present on wrappers (200 ok; 400+ error / refuse).",
+      "type": "integer"
+    }
+  },
+  "type": "object"
+}

First observedv1.5.0Sep 5, 2026

TDQS

A4.6/5.0

Behavior5/5

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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive), but the description adds substantive edge-case behavior: unknown id yields session_not_found, empty receipt lists return receipt=null instead of fabricating one, and there is no view/limit parameterization. It also discloses the returned 'chain verified' flag, which is not evident from annotations.

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

Conciseness4/5

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

Front-loads the core purpose and constraint set within a tight block, and every clause is informative. The closing 'Prefer product output (display) unless the user asked for the chain' mildly repeats the earlier exclusion, a small redundancy.

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?

With an output schema present, the description need not explain return values yet still notes receipt object or null plus a verified flag. Error cases, scope, aliases, and alternatives are all covered, leaving nothing essential missing for correct invocation.

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% and the schema already documents the session_id/id alias rule and the pattern. The description restates 'session_id or id (aliases) required' with no additional syntax or format detail beyond the schema, so the baseline of 3 applies.

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?

States a specific verb and resource ('Read the last receipt only for a raw session') and explicitly contrasts scope with the full-chain sibling runtime_session_receipts. An agent can distinguish it from runtime_session_receipts without opening either schema.

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 when-to-use ('when the user asked for the latest receipt on an open or sealed session'), when-not ('Do not use it for the full receipt chain or product output the user did not ask to audit'), and names the alternatives (runtime_session_receipts, fraggate_call display). Also gives a default preference ('Prefer product output unless the user asked for the chain').

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