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server for Fabric Verify: your agent signs a record of each action locally and gets a public, offline-checkable proof that the record existed, unchanged, by a certain time.","maintainers":[{"name":"bravozuluzero","email":"support@augmentev.com"}],"readme":"# Fabric Verify MCP server\n\nGive your AI agent a tamper-evident record of what it did.\n\nEach time the agent records an action, this server signs a short record **on your machine, with the agent's own key**, and adds it to the Fabric Verify public log. Later you get a **proof** that anyone can check offline, without trusting you or us.\n\nA proof shows that **this exact record existed, unchanged, by a certain time.** It does not show that what the record describes is true.\n\nYour text stays with you. Each record sends a salted fingerprint of it, plus the signature. **Action details stay private. The public log holds only a salted fingerprint, the action kind and time, and coded identifiers that only you, or an auditor you give an audit pack to, can link to your agents.** Records are permanent. AugmentEV keeps the agent name, key name and public key in an erasable store so they can go into your audit packs, so never put personal data in `FABRIC_AGENT` or `FABRIC_KID`.\n\n## Price\n\n| Tool | Cost |\n|---|---|\n| `record_action`, `record_event` | $0.005 per record, from prepaid credit |\n| `get_proof`, `check_balance`, `buy_credit_link`, `export_events` | free |\n\nBuy credit by card at <https://augmentev.com/pricing#buy>. Your credit key (`fvk_…`) is shown once after payment, so save it in a password manager.\n\n## Install\n\nYou need Node.js 20 or later. Add this to your MCP client's configuration:\n\n```json\n{\n  \"mcpServers\": {\n    \"fabric-verify\": {\n      \"command\": \"npx\",\n      \"args\": [\"-y\", \"@augmentev/fabric-verify-mcp\"],\n      \"env\": {\n        \"FABRIC_CREDIT_KEY\": \"fvk_...\",\n        \"FABRIC_AGENT\": \"my-agent\"\n      }\n    }\n  }\n}\n```\n\nIn Claude Code:\n\n```bash\nclaude mcp add fabric-verify --env FABRIC_CREDIT_KEY=fvk_... --env FABRIC_AGENT=my-agent -- npx -y @augmentev/fabric-verify-mcp\n```\n\n## Settings\n\n| Variable | Default | Meaning |\n|---|---|---|\n| `FABRIC_CREDIT_KEY` | (required) | Your credit key. Keep it secret. |\n| `FABRIC_AGENT` | `mcp-agent` | A stable name for this agent (printable ASCII, no spaces). |\n| `FABRIC_KID` | `<agent>-key-1` | A name for the agent's signing key. Change it when you rotate the key. |\n| `FABRIC_HOME` | `~/.fabric-verify` | Where the agent key and your records are kept (private to your user). |\n| `FABRIC_MAX_SPEND_USD` | `1` | The most this server may spend in one session. |\n\n## Tools\n\n- **`record_action`** (`kind`, `summary`, optional `idempotency_key`, optional `approval_record`): signs and logs one record, then returns its log index. The summary and its salt are saved under `FABRIC_HOME/records/<api host>/<index>/`, so you can later show what the record was about. If a call fails, call again with the same `idempotency_key`, `kind` and `summary`: the exact same signed record is resent and charged at most once.\n- **`record_event`** (`event`, `body`, optional `action`, `run_id`, `step_id`, `parent_record`, `delegation_record`, `kind`, `idempotency_key`): signs and logs one structured agent event: a tool call, its result, an approval, a delegation, a policy decision, a halt and so on (format `augmentev/fabric-agent-event/v1`). Same price as `record_action`. The event is the record's payload and stays on this machine. It returns `record`, which later events link to. For a tool call, pass `action` (tool, server, arguments), and pass the same `action` when recording its approval, so both name the same action. If your account's governance policy requires approval for tool calls, set `body.approval_record` and the approval is presented to the log, which uses it once. A tool result is signed as kind `other`, so that rule does not also gate results.\n- **`export_events`** (`run_id` or `indices`): bundles events recorded from this machine, with their proofs, into one file that anyone can check offline with `augmentev-verify agent-events`. Free. Fetch the proofs first. The bundle shows that its events were logged unchanged and that every link points to an earlier event of the right type. It does not show that the bundle holds every event, or that a described tool result is true. Events recorded on another machine (another agent's approval, say) are in that machine's bundle; merge records in log order to check them together.\n- **`get_proof`** (`index`, optional `wait_seconds` up to 45): fetches the proof and saves it next to the record. Proofs are usually ready a few minutes after recording.\n- **`check_balance`**: shows your remaining credit and this session's spend.\n- **`buy_credit_link`** (`amount_usd`: 25, 50, 100 or 500): returns a card checkout link for a person to open. This tool charges nothing.\n\n## Check a proof\n\nDownload the verifier and the published log keys from <https://augmentev.com/verify>, then run this in the record's folder:\n\n```bash\naugmentev-verify log-proof proof.json --pins fabric-log-v2.json --audit agent-record.json\n```\n\n## Pin the version\n\nFor production agents, pin an exact version, such as `npx -y @augmentev/fabric-verify-mcp@0.2.2`, and update deliberately. The package ships a lockfile (`npm-shrinkwrap.json`) so its dependencies are fixed too.\n\n## Keep your agent key\n\nThe agent key is `FABRIC_HOME/agent-ed25519.pem`. Back it up. Each key name (`FABRIC_KID`) belongs to one key for good. 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