---
title: Devin
description: How ClawMetry observes Devin — where its data lives, the environment variables that move it, what cost data is real, and the traps in its store.
eyebrow: Runtime reference
---

# Devin

ClawMetry reads the **Devin CLI**, which keeps every session in a local SQLite database. Devin Cloud sessions are reachable only through an authenticated vendor API and are deliberately out of scope — a local-first observer should not be making authenticated egress calls with your enterprise key.

| | |
|---|---|
| **Runtime id** | `devin` |
| **Category** | Autonomous engineer (CLI) |
| **Vendor** | Cognition |
| **Tier** | Paid tier (Starter and up) |
| **Upstream** | [devin.ai](https://devin.ai) |

## Where the data comes from

ClawMetry reads these locations, in order, and never writes to any of them.

- `$XDG_DATA_HOME/devin/cli/sessions.db (default ~/.local/share/devin/cli)`
- `$XDG_DATA_HOME/devin/cli/logs/devin_<ts>_<pid>.log`

**Format.** One SQLite database holding every session: `sessions`, `message_nodes` (a forest, not a list) and `tool_call_state`.

## Environment variables

| Variable | Effect |
|---|---|
| `CLAWMETRY_DEVIN_DB` | point at a specific sessions.db |
| `CLAWMETRY_DEVIN_HOME` | home override |
| `XDG_DATA_HOME` | honoured for the default path |

See [Environment variables](/docs/config/environment/) for the variables that apply to every runtime.

## Tokens and cost

**Tokens.** On the message metadata: `num_tokens`, plus committed ACU and credit cost.

**Cost.** Committed ACU / credit cost per message, summed over the active chain only.

:::note Why this section exists
Runtimes differ enormously in what they persist. Rather than showing a plausible number everywhere, ClawMetry reports what the store actually contains and marks the rest unknown. A cost of `$0.00` and a cost of *unknown* mean different things, and the dashboard keeps them different.
:::

## Things worth knowing

- `message_nodes` is a forest: `/fork` and `/revert` leave abandoned turns in place as sibling branches. Summing every row bills you for work you threw away, so ClawMetry walks the active chain from `main_chain_id` and reports the abandoned nodes as a count.
- `/rm-session` sets `hidden=1` instead of deleting. Those stay out of the list — a session you deleted should not be resurrected.
- Devin Desktop (formerly Windsurf) never writes Cascade sessions to disk, so there is nothing local to read. It is not this adapter.

## Verify it is being read

```bash
# Is this runtime detected, and would this install unlock it?
clawmetry runtimes --json | jq '.runtimes[] | select(.id=="devin")'

# Why is it locked, if it is?
clawmetry runtimes --why devin

# Any sessions ingested yet?
curl -s 'http://localhost:8900/api/local/sessions?limit=5' \
  | jq '.rows[] | {session_id, agent_id, events, cost_usd}'
```

If detection succeeds but no sessions appear, work through [Troubleshooting](/docs/ops/troubleshooting/) — the usual causes are a relocated data directory (set the override above), a session limit that is hiding older runs, or a runtime that simply has not written anything yet.