Captain now saves agent session records when a user message includes an
image. The saved record keeps the image URL and excludes downloaded
image bytes, so image replies no longer report a JSON serialization
error after delivery.
Fixes:
https://chatwoot-p3.sentry.io/issues/7618423184/?alert_rule_id=13673680&alert_type=issue¬ification_uuid=d22a7ab9-95d6-4bba-85e0-733a28466775&project=6382945
## Root cause
RubyLLM downloads image attachments and caches the binary bytes inside
`RubyLLM::Content`. `SessionCaptureService` passed the live object to
the `run_context` JSON column. Rails then tried to encode the cached
JPEG bytes as UTF-8 and raised `JSON::GeneratorError`.
The error did not block replies, handoffs, or credit updates because
session capture rescues its own failures. The failed write meant that
Chatwoot lost the agent session record for the response.
## How to reproduce
1. Send an image to a Captain V2 assistant.
2. Let RubyLLM load the image during the model request.
3. Save the resulting conversation history in an agent session.
4. Observe the JSON encoding error when Rails reaches the cached image
bytes.
## What changed
`SessionCaptureService` now converts `RubyLLM::Content` to its JSON safe
hash before saving the current turn. The hash contains the message text
and attachment URL without the cached bytes. Other message content is
unchanged.
The focused service spec covers a cached JPEG byte payload and passes
with 12 examples. RuboCop reports no offenses in the changed service and
spec.
Records a `Captain::Session` row for every Captain V2 assistant response
delivered in a conversation, so we can show how a response was generated
and report on credit, FAQ, and document usage. Stacked on #14970 (the
`captain_sessions` model).
## What changed
- `FaqLookupTool` now records the retrieved FAQ ids (and their backing
document ids) into the shared run state, accumulated across tool calls.
- `AgentRunnerService` exposes the raw ai-agents run result via
`last_run_result`; the `generate_response` return shape is unchanged, so
the playground path is unaffected.
- New `Captain::Assistant::SessionCaptureService` builds the session:
scenario resolved from the answering agent name, model from
`assistant.agent_model`, token usage plus the trimmed current-turn
conversation history stored in `run_context`.
- `ResponseBuilderJob` captures after delivery: `credits_consumed`
mirrors the actual charge (1.0 for a billed response, 0.0 for handoffs,
where the session points at the customer-facing handoff message).
Capture runs outside the delivery transaction and swallows its own
failures, so a logging bug can never block or roll back a customer
reply.
V1 responses and copilot are out of scope; copilot capture comes next.
## How to test
On an account with `captain_integration_v2` enabled and an inbox
connected to an assistant with approved FAQs, send a customer message on
a pending conversation. After the assistant replies, a
`Captain::Session` row should exist with the conversation as subject,
the reply message as result, the FAQs/documents used, and the run
context for that turn. Asking for a human agent should produce a
zero-credit session pointing at the handoff message.
<img width="2428" height="1058" alt="CleanShot 2026-07-15 at 17 25
40@2x"
src="https://github.com/user-attachments/assets/d8e44923-c17b-494f-8c33-c8fa4219438c"
/>
