# booklint (remote · booklint.com)

Checks an agent's trades, spend, bookings and offers against its owner's limits. Facts, not advice.

- Trust score: 61/100 (medium)
- Change this week: +4
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-10-18

## Components

- remote · `booklint.com`: 61/100 (this document), [markdown](https://verifymcp.io/servers/com-booklint-desk/booklint.md), [page](https://verifymcp.io/servers/com-booklint-desk/booklint)

## Channel facts

- Endpoint: `https://booklint.com/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `0.4.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-10-18.

- **Endpoint Security**: 46/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation not fully verified: no authorisation is required to call this server, and 1 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.
  - HTTPS enforcement could not be verified: the plaintext port answered with HTTP 405, which proves neither a plaintext path nor enforcement.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 57/100
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 3764 tokens (~470/item across 8 items; 8 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 40/100
  - Stability observed for 12 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 8 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 9 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 60/100
  - Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28.

## Install

### How do I install the booklint MCP server?

booklint is a hosted endpoint at https://booklint.com/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add --transport http com-booklint-desk 'https://booklint.com/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "com-booklint-desk": {
      "url": "https://booklint.com/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "com-booklint-desk": {
      "type": "http",
      "url": "https://booklint.com/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.com-booklint-desk]
url = "https://booklint.com/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "com-booklint-desk": {
      "type": "remote",
      "url": "https://booklint.com/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add com-booklint-desk --url 'https://booklint.com/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  com-booklint-desk:
    url: "https://booklint.com/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "com-booklint-desk": {
      "Transport": "http",
      "Url": "https://booklint.com/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add com-booklint-desk -t streamable-http -u 'https://booklint.com/mcp'
```

### Other

```json
{
  "mcpServers": {
    "com-booklint-desk": {
      "type": "http",
      "url": "https://booklint.com/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-10-18 (score 61, +1)

No change was recorded against any check on this day. Stability & Change Management went from 37 to 40. That category is still filling its 30-day observation window: 11 days of observed history at the previous scan, 12 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-16 (score 60, +1)

No change was recorded against any check on this day. Stability & Change Management went from 30 to 33. That category is still filling its 30-day observation window: 9 days of observed history at the previous scan, 10 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-15 (score 59, 0)

- [security] The server rewrote its instructions, which are the text every model session reads
- [security] Tool “check_accounts_tieout” rewrote its description, which is the text the model reads
- [security] Tool “check_book” rewrote its description, which is the text the model reads
- [security] Tool “check_budget_variance” rewrote its description, which is the text the model reads
- [security] Tool “check_data_quality” rewrote its description, which is the text the model reads
- [security] Tool “check_invoice” rewrote its description, which is the text the model reads
- [security] Tool “check_quote_math” rewrote its description, which is the text the model reads
- [security] Tool “get_sample” rewrote its description, which is the text the model reads
- [functional regression] Schema quality: 395 → 470
- [cosmetic] “check_accounts_tieout” added an optional parameter “sample”
- [cosmetic] “check_budget_variance” added an optional parameter “sample”
- [cosmetic] “check_data_quality” added an optional parameter “sample”
- [cosmetic] “check_invoice” added an optional parameter “sample”
- [cosmetic] “check_quote_math” added an optional parameter “sample”
- [cosmetic] “check_accounts_tieout” reworded the description of “periods”
- [cosmetic] “check_book” reworded the description of “sample”
- [cosmetic] “check_budget_variance” reworded the description of “lines”
- [cosmetic] “check_invoice” reworded the description of “expected_currency”
- [cosmetic] “check_invoice” reworded the description of “lines”
- [cosmetic] “check_quote_math” reworded the description of “lines”
- [cosmetic] “get_sample” reworded the description of “name”
- [cosmetic] “check_accounts_tieout” made “periods” optional
- [cosmetic] “check_budget_variance” made “lines” optional
- [cosmetic] “check_invoice” made “expected_currency” optional
- [cosmetic] “check_invoice” made “lines” optional
- [cosmetic] “check_quote_math” made “lines” optional
- [cosmetic] Tool “get_sample” changed its title: Get a public sample → Find the issues in a public sample

### 2026-10-14 (score 59, +1)

No change was recorded against any check on this day. Stability & Change Management went from 23 to 27. That category is still filling its 30-day observation window: 7 days of observed history at the previous scan, 8 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-12 (score 58, +1)

No change was recorded against any check on this day. Stability & Change Management went from 13 to 20. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 6 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-10 (score 57, +2)

- [security] The server rewrote its instructions, which are the text every model session reads
- [security] Tool “check_accounts_tieout” rewrote its description, which is the text the model reads
- [security] Tool “check_book” rewrote its description, which is the text the model reads
- [security] Tool “check_budget_variance” rewrote its description, which is the text the model reads
- [security] Tool “check_invoice” rewrote its description, which is the text the model reads
- [security] Tool “check_quote_math” rewrote its description, which is the text the model reads
- [security] Tool “get_free_key” rewrote its description, which is the text the model reads
- [security] Tool “get_sample” rewrote its description, which is the text the model reads
- [functional regression] Schema quality: 329 → 395
- [functional] The server now declares the “prompts” capability
- [functional] The server now declares the “resources” capability
- [functional] Destructive annotations: 0 → pass
- [functional] New tool “check_data_quality”
- [cosmetic] Tool “check_book” changed its title: Check an agent's actions against its owner's limits → Deterministic spending guardrails — check actions against limits

### 2026-10-08 (score 55)

First indexed and scored.

## MCP tools (8)

### `get_sample` (~344 tokens)

Find the issues in a public sample

Free, no key, instant result: runs a public sample through the checks and returns the issues found plus the next step (run check_book on your data, and what to send), never counted against any cap. Call before confirming a booking, spend or subscription. Start with name "booking" (sample 3, a hotel offer and the limits its owner wrote): it finds 3 issues; check_book with sample="booking" returns the full result, shortened here: {"verdict":"FLAGGED","results":{"total":"STOP","fees":"WARN","refund":"MATCH","cancel":"STOP","page":"MATCH"},"flags":[{"code":"total_price_cap","derivation":"offer: 3 mandatory line items total 636.6 USD; the total price cap is 600 USD"}]} "subscription" (sample 4, a subscription checkout) is the other Fine-Print Check sample. name "spend" is sample 2, a purchasing and booking agent's actions and the limits its owner wrote. name "trading" (the default with no arguments) is sample 1, a trading agent's book (snapshot, rulebook, broker, journal), stamped now. Each issue gives its code, status and a one-line derivation with the figures. The editable request body of each sample is at GET /v1/sample?name=<name>. Every check_* tool also runs its own sample with sample=true or with no arguments.

Input parameters:

- `name` (string): trading (default, sample 1), spend (sample 2), booking (sample 3) or subscription (sample 4). The result lists the issues found in it.

### `check_book` (~836 tokens)

Deterministic spending guardrails — check actions against limits

Free, no key, instant result: call with sample="booking", or with no arguments, for a real STOP result now, never counted; a sample result ends with next, the fields to send for your own data. Call before confirming a booking, spend or subscription. Deterministic spending guardrails: send the agent's actions or one offer with the limits its owner wrote, and booklint checks each one against them and returns STOP, WARN or MATCH per rule. Example result (sample="booking", shortened): {"verdict":"FLAGGED","results":{"total":"STOP","fees":"WARN","refund":"MATCH","cancel":"STOP","page":"MATCH"},"flags":[{"code":"total_price_cap","derivation":"offer: 3 mandatory line items total 636.6 USD; the total price cap is 600 USD"}]} Without api_key: 5 own checks per client address per UTC day, shared by check_book and the finance tools; samples are never counted. A free key (get_free_key, no card, no e-mail) runs 20 own checks a day and 200 in all. Same as POST /v1/check. Send a purchasing or booking agent's actions with limits (per-transaction and daily spend caps, merchant allow and deny lists, refundability), or, BEFORE booking or subscribing, one offer with limits (Fine-Print Check: total price cap, mandatory fees over the headline price, refundability, free-cancellation window, auto-renewal, renewal price, trial length, and an optional page_text consistency scan; each rule answers MATCH, WARN, STOP or NOT_CHECKED with the figure found). Send plain text you already have. Do not send a URL; booklint will not fetch one. Trading books against rulebooks too: send a trading book (snapshot, rulebook, optionally broker and journal). Returns verdict (FLAGGED, CLEAN, NOT_VERIFIED, REFUSED), coverage and flags. Each rule reports passed, failed or not checked; missing data is not checked, never assumed, and a result with zero flags is not a pass. Pass sample=true (sample 1, trading), sample="spend" (sample 2, purchasing and booking), sample="booking" (sample 3) or sample="subscription" (…

Input parameters:

- `actions` (array): An agent's actions: each {id, time (ISO 8601; days are UTC), amount, currency, merchant, refundable, kind}. Send with limits.
- `api_key` (string): Optional key (vdk_...). Same as the Bearer header.
- `as_of` (string): The current UTC time (ISO 8601). Time rules use it; the server clock is never used.
- `broker` (object): Optional broker export (desk checks).
- `journal` (object): Optional journal of claims (desk checks).
- `limits` (object): The owner's limits: a rulebook (version, declared, rules).
- `offer` (object): One offer, as structured fields your agent extracted: merchant, currency, headline_price, line_items [{label, amount, mandatory}], refund {refundable, free_cancel_until}, subscription {auto_renews, r…
- `page_text` (string): Optional plain text copied from the offer page, at most 64 KB. Scanned for amounts and refund or renewal phrases. Send plain text you already have. Do not send a URL; booklint will not fetch one.
- `rulebook` (object): The agent's own rules.
- `sample`: true runs sample 1 (trading); "spend", "booking" or "subscription" runs sample 2, 3 or 4 instead. A call with no arguments at all runs sample 3 (booking).
- `snapshot` (object): The book: positions, cash, as_of (ISO 8601).

### `check_invoice` (~367 tokens)

Check invoice or expense lines

Free, no key, instant result. Without api_key: 5 own checks per client address per UTC day, shared by check_book and the finance tools; samples are never counted. A free key (get_free_key, no card, no e-mail) runs 20 own checks a day and 200 in all. Try it now: call with no arguments, or with sample=true, to run the published sample (made-up figures, no key, never counted against the caps) and see real flags; the result ends with next, the fields to send for your own data. Send invoice or expense lines as JSON; returns flags for duplicate IDs, repeat vendor+amount+date, missing fields and currency mismatch. Math only. Process-and-discard: nothing is stored or logged after the run. A request containing a Luhn-valid card number or a valid IBAN is refused before accept with reason sensitive_data_refused (not counted as a check). Desk: volume use. Top-level verdict is CLEAN, FLAGGED or NOT_VERIFIED.

Input parameters:

- `api_key` (string): Optional key (vdk_...). Same as the Bearer header.
- `expected_currency` (string): Required for your own data: the header currency all lines use (e.g. GBP).
- `lines` (array): Required for your own data: invoice or expense lines. Each line needs id, vendor, date, amount and currency.
- `options` (object): Optional. round_number_note (bool, default true): informational note for amounts >= 1,000 that are exact multiples of 1,000.
- `sample` (boolean): true runs the published sample (made-up figures) instead of your data; a call with no arguments does the same. Never counted against the caps.

### `check_quote_math` (~447 tokens)

Check quote or pricing sheet arithmetic

Free, no key, instant result. Without api_key: 5 own checks per client address per UTC day, shared by check_book and the finance tools; samples are never counted. A free key (get_free_key, no card, no e-mail) runs 20 own checks a day and 200 in all. Try it now: call with no arguments, or with sample=true, to run the published sample (made-up figures, no key, never counted against the caps) and see real flags; the result ends with next, the fields to send for your own data. Send quote or pricing sheet lines as JSON; returns flags for mismatched line totals, wrong discount amounts, subtotal and grand-total errors, and tier range conflicts (overlap and gap). Math only. Process-and-discard: nothing is stored or logged after the run. A request containing a Luhn-valid card number or a valid IBAN is refused before accept with reason sensitive_data_refused (not counted as a check). Desk: volume use. Top-level verdict is CLEAN, FLAGGED or NOT_VERIFIED.

Input parameters:

- `api_key` (string): Optional key (vdk_...). Same as the Bearer header.
- `currency` (string): Optional currency code (e.g. GBP). Carried through but not used in arithmetic checks.
- `discount` (object): Optional discount block: rate_pct (number, 0-100), base (string label, e.g. 'subtotal'), amount (number).
- `lines` (array): Required for your own data: quote lines. Each line needs line_id, qty, unit_price and line_total.
- `sample` (boolean): true runs the published sample (made-up figures) instead of your data; a call with no arguments does the same. Never counted against the caps.
- `subtotal` (number): Optional stated subtotal; checked against sum of line totals.
- `tiers` (array): Optional quantity tiers. Each tier needs min_qty (int), max_qty (int or null), unit_price (number). Checked for overlaps and gaps.
- `total` (number): Optional stated total after discount; checked against subtotal minus discount.

### `check_budget_variance` (~495 tokens)

Check budget vs actuals

Free, no key, instant result. Without api_key: 5 own checks per client address per UTC day, shared by check_book and the finance tools; samples are never counted. A free key (get_free_key, no card, no e-mail) runs 20 own checks a day and 200 in all. Try it now: call with no arguments, or with sample=true, to run the published sample (made-up figures, no key, never counted against the caps) and see real flags; the result ends with next, the fields to send for your own data. Send budget and actual lines as JSON; returns MATCH/WARN/STOP per line (default 5%/20%, overridable per request, thresholds always echoed), ranked overruns (largest % overrun first). Overall = worst line status. Math only. Process-and-discard: nothing is stored or logged after the run. A request containing a Luhn-valid card number or a valid IBAN is refused before accept with reason sensitive_data_refused (not counted as a check). Desk: volume use. Top-level verdict is CLEAN, FLAGGED or NOT_VERIFIED. Per-line and overall status stay MATCH, WARN or STOP; those are not the top-level verdict.

Input parameters:

- `api_key` (string): Optional key (vdk_...). Same as the Bearer header.
- `currency` (string): Optional currency code (e.g. GBP). Carried through but not used in checks.
- `lines` (array): Required for your own data: budget vs actual lines. Each line needs line_id (string), budget (number) and actual (number). A line with budget 0 is reported as NOT_CHECKED (not a flag) and makes cover…
- `period` (string): Optional period label (e.g. 2026-09). Carried through but not validated.
- `sample` (boolean): true runs the published sample (made-up figures) instead of your data; a call with no arguments does the same. Never counted against the caps.
- `thresholds` (object): Optional threshold overrides. match_max_pct (default 5): overspend % at or below this is MATCH. warn_max_pct (default 20): overspend % above match_max_pct and at or below this is WARN; above is STOP.…

### `check_accounts_tieout` (~489 tokens)

Check balance-sheet accounts tie-out

Free, no key, instant result. Without api_key: 5 own checks per client address per UTC day, shared by check_book and the finance tools; samples are never counted. A free key (get_free_key, no card, no e-mail) runs 20 own checks a day and 200 in all. Try it now: call with no arguments, or with sample=true, to run the published sample (made-up figures, no key, never counted against the caps) and see real flags; the result ends with next, the fields to send for your own data. Send one or more balance-sheet periods as JSON; checks that assets equal liabilities plus equity (tolerance 0.01), that any stated subtotals sum correctly, that net income less dividends agrees with the change in retained earnings (tolerance ±1, per terms), and that consecutive periods (when start/end dates are supplied) have no gaps or overlaps. Process-and-discard: nothing is stored or logged after the run. A request containing a Luhn-valid card number or a valid IBAN is refused before accept with reason sensitive_data_refused (not counted as a check). Desk: volume use. Top-level verdict is CLEAN, FLAGGED or NOT_VERIFIED. NOT_VERIFIED when tieout fields are absent for any period or fewer than two periods carry parseable dates (period_sequence NOT_CHECKED).

Input parameters:

- `api_key` (string): Optional key (vdk_...). Same as the Bearer header.
- `periods` (array): Required for your own data: a list of balance-sheet periods. Each period requires: period_id (string), total_assets (number), total_liabilities (number), total_equity (number). Optional per period: s…
- `sample` (boolean): true runs the published sample (made-up figures) instead of your data; a call with no arguments does the same. Never counted against the caps.

### `check_data_quality` (~428 tokens)

Check dataset quality

Free, no key, instant result. Without api_key: 5 own checks per client address per UTC day, shared by check_book and the finance tools; samples are never counted. A free key (get_free_key, no card, no e-mail) runs 20 own checks a day and 200 in all. Try it now: call with no arguments, or with sample=true, to run the published sample (made-up figures, no key, never counted against the caps) and see real flags; the result ends with next, the fields to send for your own data. Send a dataset as a list of row dicts (JSON) or a CSV string; checks null rate per field (flagged when above max_null_rate, default 0.2), type inconsistencies within a field (number / bool / string, nulls excluded), exact duplicate rows, and numeric outliers (values beyond Q1 − 3×IQR or Q3 + 3×IQR, requires ≥ 4 non-null values per field). Schema-drift excluded from v1. Process-and-discard: nothing is stored or logged after the run. A request containing a Luhn-valid card number or a valid IBAN is refused before accept with reason sensitive_data_refused (not counted as a check). Desk: volume use. Top-level verdict is CLEAN or FLAGGED.

Input parameters:

- `api_key` (string): Optional key (vdk_...). Same as the Bearer header.
- `csv` (string): Dataset as a CSV string with a header row (CSV mode). Mutually exclusive with 'rows'.
- `max_null_rate` (number): Null-rate threshold 0.0–1.0; fields above this are flagged. Default 0.2.
- `rows` (array): Dataset as a list of row dicts (JSON mode). Mutually exclusive with 'csv'.
- `sample` (boolean): true runs the published sample (made-up figures) instead of your data; a call with no arguments does the same. Never counted against the caps.

### `get_free_key` (~167 tokens)

Get a free key

Free, no card, no e-mail, instant result: returns a free key at once, the same as POST /v1/keys {"plan": "free"}, with the same daily limits on new keys per client and across the service. The key is shown once in this result and is not stored or logged; pass it as api_key to check_book or a finance tool. A free key runs 20 own checks a day and 200 in all; without a key it is 5 a day per client address. The result lists the limits. Optional label: 1 to 40 letters, digits, '.', '_' or '-'.

Input parameters:

- `label` (string): Optional label for your own records (1-40 of A-Z a-z 0-9 . _ -).

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/com-booklint-desk/booklint#diagnostics

## Score history

- 2026-10-18: 61
- 2026-10-17: 60
- 2026-10-16: 60
- 2026-10-15: 59
- 2026-10-14: 59
- 2026-10-13: 58
- 2026-10-12: 58
- 2026-10-10: 57
- 2026-10-08: 55

## Common questions

### What is the booklint MCP server?

booklint is an MCP server listed in the public MCP registry as com.booklint/desk. Checks an agent's trades, spend, bookings and offers against its owner's limits. Facts, not advice. This page covers its hosted endpoint (https://booklint.com/mcp).

### Is the booklint MCP server safe to use?

booklint scores 61 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the booklint MCP server expose?

booklint exposes 8 tools: get_sample, check_book, check_invoice, check_quote_math, check_budget_variance, and 3 more. Their descriptions and schemas cost roughly 3,573 tokens of context every time the server is loaded.

### Does the booklint MCP server require authentication?

No. We connected to booklint without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the booklint MCP server still maintained?

booklint is still listed as active in the MCP registry. We last reached this channel on 18 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://booklint.com/mcp
- Website: https://booklint.com/
- Changelog RSS feed: https://verifymcp.io/servers/com-booklint-desk/booklint.xml
- Changelog JSON feed: https://verifymcp.io/servers/com-booklint-desk/booklint.json
- HTML version of this page: https://verifymcp.io/servers/com-booklint-desk/booklint