Storyblok

# Fix list: Storyblok

From Anchor Terminal's listing at https://www.anchorterminal.com/tools/storyblok, the October 2026 research run, assessed 7 October 2026. Grade B, 67.7 out of 100.

This is everything the published grade says the listing lacks, the biggest possible gain to the total first. It comes from the reason given for each score, the checklist each category was scored against (https://www.anchorterminal.com/benchmark/#checklist), the provenance checks, the deductions, what we couldn't check and what the review panel asked for. A fix counts at the next check, once it's public.

For a coding agent working on Storyblok: work through the items below in the product, its docs and its public pages. Each category gives the reason for its score, with the points each checklist item earned, and the checklist itself, so the gap is the items that earned less than their points. Change the product, not the wording, and keep a note of what you changed and where it's published.

## 1. Payments & pricing, 35 out of 100, up to 8.1 more on the total

Why it scored 35: No x402, MPP or L402 (0). Plan prices are public ($99 and $349 a month) with unit prices for overage on Growth ($10 per million API requests, $15 a seat, $20 a locale). Premium and Elite are priced through sales (15). Starter is free with no card and includes the Management API (20). A person signs up in a browser and creates the token or approves the OAuth consent screen (0).

The checklist (https://www.anchorterminal.com/benchmark/#checklist-payments):

The published rubric, also on the [x402 page](https://www.anchorterminal.com/x402/).

- 40, a machine payment protocol (x402, MPP or L402) on the tool's own endpoints. 10 to 30 when it covers only some endpoints or only goes through a third party, and the note says which.
- 20, per-call or per-unit pricing published without a login. 10 for public plan-only pricing, 0 for "contact sales" or prices behind a login.
- 20, a free tier or trial that doesn't need a card.
- 20, autonomous onboarding, meaning an agent can get access without a person signing up in a browser (keyless use, x402, a programmatic key API).

Payment platforms and agent wallets rarely charge for their own API over a machine protocol, so the first line has steps for them, and the highest one that applies counts. 40 when x402, MPP or L402 runs on all their own endpoints, 30 when it runs on part of their own API, 25 when their merchants can accept one, 20 for running a facilitator, 15 for paying as a buyer, and 0 when the only protocol is their own. Merchant acceptance sits above a facilitator because the platform's own customers can charge agents through it, while a facilitator settles for sellers who wire up the protocol themselves. The counter-argument (a facilitator does more for the protocol as a whole) has a point. Each note says which step applied.

Open-source software you run yourself is scored on its hosted or paid option if it has one. A free, self-hosted package with nothing to buy gets 20, 20 and 20 for the last three lines, and 0 to 40 for the first only if it ships a payment protocol.

## 2. Schema & documentation, 68 out of 100, up to 5.2 more on the total

Why it scored 68: The only public OpenAPI spec is for the Content Delivery API (3.1, 14 operations). The Management API spec that the official client is generated from sits in the private storyblok/openapi-wdx repository, per the monoblok README. The MCP `describe` tool returns parameter and body schemas per operation to a signed-in client, which we couldn't read (12 of 25). A root llms.txt and a Markdown copy of every docs page at the same URL plus .md (10). The MCP page says when to use the server and when to use the CLI, and names each tool's purpose (16). The reference types every parameter and marks required ones, but story content is a free-form object checked against the space's component schemas (8). Request examples in nine languages on each endpoint. Errors are covered by one line on standard HTTP codes (9). The /v1 path, a dated changelog with an RSS feed, and changes to v1 made in place (13).

The checklist (https://www.anchorterminal.com/benchmark/#checklist-schema):

APIs and MCP servers.

- 25, a machine-readable contract (a public OpenAPI file or similar; for MCP, typed JSON Schema inputs on every tool).
- 10, llms.txt or Markdown docs served for agents.
- 0 to 20, descriptions that say what a tool is for, when to use it and when not to, read from the tool definitions in the source or the API reference.
- 0 to 15, typed inputs with enums, constraints and required fields, and no free-form JSON blobs.
- 0 to 15, examples and documented error responses.
- 15, versioning and a public changelog.

Models are read from the API reference, the OpenAPI file, llms.txt, the structured-output and tool-use docs and the model cards. Frameworks from docs a model can follow, typed interfaces, examples and the API reference.

## 3. Security & auth, 73 out of 100, up to 4.7 more on the total

Why it scored 73: OAuth with PKCE S256, dynamic client registration, refresh tokens, revocation and 29 scopes on a read, write and publish hierarchy, or personal access tokens with scopes, a space list and an expiry date (30). Less 5 because Content Delivery API tokens travel in the `token` query parameter. That is a judgement call. Those tokens are read-only and not the graded surface, so we took half the checklist's 10. Scopes separate read, write and publish per space, and `execute_destructive` needs explicit user confirmation. Unscoped legacy tokens work until 30 November 2026 (18). The changelog names prompt-injected tokens as a risk that scoping limits, and the MCP page asks users to read plans back before writes. No guidance on treating stored content as untrusted (8). Activity log on every plan with an Activities endpoint, kept 1 day on Starter and 30 days on Growth (11). ISO 27001, TISAX, third-party penetration tests and a security contact address. No security.txt, bug bounty or SOC 2 report found (11).

The checklist (https://www.anchorterminal.com/benchmark/#checklist-security):

- 0 to 30, the credential model. 30 for OAuth 2.1 with scopes, or scoped and revocable keys with rotation. 20 for plain revocable API keys. 10 for one all-powerful key. 10 off when a secret can travel in a URL query string as a documented option.
- 0 to 20, read-only or least-privilege modes, and confirmation or approval for destructive actions.
- 0 to 15, prompt-injection posture where the tool returns untrusted content (documented mitigations or guidance). A tool that returns no untrusted content gets 10.
- 0 to 15, audit logs or per-call visibility for the operator.
- 0 to 20, a security programme. security.txt or a disclosure policy, a bug bounty, SOC 2 or ISO 27001, advisories handled in public.

Models are read for retention, whether API data trains models (and whether that's off by default), zero-retention options and certifications. Frameworks for telemetry defaults, approval hooks, guardrails and sandboxing.

## 4. Reliability, 79 out of 100, up to 4.2 more on the total

Why it scored 79: Graded on the Management API and the hosted MCP server. Public status page at uptime.storyblok.com with 90 days of daily history for four monitors (Content Delivery API v1 and v2, GraphQL API, Image Service), but none for the Management API or the MCP server (15 of 20). All four show 100 per cent over 90 days and no status updates in the last seven days. With the graded surface unmonitored we read that as 20 of 30. Rate limits published, 3 requests a second on Starter and 6 on paid plans (15). The docs advise slowing down on 429 and retrying with exponential backoff, and the official client retries on 429. No Retry-After header in the API docs and no idempotency keys found (9). SLA of 97 per cent on Growth and Growth Plus, 99.9 on Premium and 99.99 on Elite, stated for the Content Delivery API (10). Management API v1 is generally available and the MCP docs carry no beta label (10).

The checklist (https://www.anchorterminal.com/benchmark/#checklist-reliability):

Hosted APIs, MCP servers, models and platforms.

- 20, a public status page with component history (Statuspage, Instatus, BetterStack or the vendor's own).
- 0 to 30, the incident record for the last 90 days on that page. 30 for a clean record or trivial incidents only, 20 for minor incidents only, 10 for one major outage (an hour or more of a core API down, or errors across the board), 0 for several. 5 when there's no history we could read, and the note says so.
- 15, rate limits documented with numbers.
- 15, documented 429 or overload handling (Retry-After, backoff guidance), and idempotency keys or safe-retry guidance where writes are involved.
- 10, an SLA published for any paid tier.
- 10, the surface agents use is generally available, not beta or preview.

Local packages, SDKs, frameworks and stdio MCP servers.

- 20, installs from an official package with supported runtimes stated.
- 25, a public CI and test suite, passing on the default branch.
- 0 to 25, open crash or regression issues relative to activity (25 for few and handled, 0 for many, old and unanswered).
- 15, semver discipline and breaking changes called out in a changelog.
- 15, version 1.0 or later, or declared stable.

Protocols are read from their reference implementations, the public facilitators or servers, spec stability and test vectors.

## 5. Agent ergonomics, 78 out of 100, up to 3.6 more on the total

Why it scored 78: Seven MCP tools cover the whole Management API through search, describe and execute, and a `fields` filter trims responses before they return (25). `page` and `per_page` up to 1,000 with a `total` header, and about 30 filters on the story list (20). Error bodies aren't documented beyond HTTP status codes. Validation failures return 422 with the limit and the current value (8). No idempotency keys. Publish, unpublish and restore are GET requests that change state. MCP splits calls into read-only, mutating and destructive tools, and we couldn't read the tool annotations (10). Few required parameters, and official Management API clients for JavaScript and PHP plus universal clients for Swift and Kotlin (15).

The checklist (https://www.anchorterminal.com/benchmark/#checklist-ergonomics):

- 0 to 25, context cost. For MCP, the number and size of the tool definitions (25 for ten or fewer compact tools, 15 for 11 to 30, 5 for more than 30, plus up to 10 back for toolsets, dynamic loading or read-only subsets). For APIs, whether responses can be sized (field selection, limits, summaries).
- 20, pagination, filtering and output-size controls.
- 20, actionable, documented error responses, codes and messages an agent can recover from.
- 20, idempotency or safe retries, and for MCP the `readOnlyHint` and `destructiveHint` annotations.
- 15, sensible defaults, few required parameters, and official SDKs in at least two languages.

Models are read for tool use, structured output, prompt caching, context length, batch and SDKs. Frameworks for how much code and how many defaults a tool-calling agent with MCP needs.

## 6. Maintenance & community, 80 out of 100, up to 1.8 more on the total

Why it scored 80: The changelog has entries on 5 October 2026 and the Management API client 0.9.1 was tagged on 1 October 2026 (30). Eight dated changelog entries and more than ten client releases in the last 90 days (20). Public changelog with RSS, a help centre and a Discord community. Of the five newest GitHub issues, two were closed within a week and three had no reply after 9 to 14 days (10 of 15). Current official SDKs and CLI, though no Storyblok entry in the official MCP registry (13). The monoblok repository has CI, release and commit-lint workflows and 170 commits in 90 days. We didn't check that CI passes (7).

The checklist (https://www.anchorterminal.com/benchmark/#checklist-maintenance):

- 0 to 30, time since the last release, or the last published model or API change for a closed service. 30 within 30 days, 20 within 90, 10 within 180, 0 older.
- 20, at least three releases or dated changelog entries in the last 90 days.
- 0 to 25, responsiveness. Issues and pull requests answered on GitHub (the open issues and how recent the replies are). For closed services, a public changelog and a support or community channel that answers, 0 to 15.
- 15, presence in the official MCP registry under a verified namespace (MCP servers), or current official SDKs (APIs and models).
- 10, package health, current dependencies and CI.

Models are read for deprecation notice periods and model churn rather than release counts.

## 7. Transparency & trust, 80 out of 100, up to 1.8 more on the total

Made of editorial 73, provenance 87.

Why it scored 80: Closed service with published self-service and enterprise terms, and MIT client libraries (17). DPA effective 22 April 2026, privacy policy effective 6 October 2025, customer content kept up to 90 days after termination, log files 30 days, and AI terms saying input isn't used for training. We found no contradiction between them (25). No written deprecation policy, but dated notices, such as six months for unscoped tokens (30 November 2026) and about a month for Management API validation (13). Sub-processors with locations in DPA Annex 3 and data residency in the EU, US, Canada and Australia (18).

The checklist (https://www.anchorterminal.com/benchmark/#checklist-transparency):

- 0 to 30, source availability and licence clarity. 30 for open source under an OSI licence, 15 for closed with clear terms, 0 for unclear terms.
- 0 to 30, data handling and retention statements that agree with each other (privacy policy, DPA, retention periods, subprocessors).
- 0 to 20, a deprecation policy or notices with dates.
- 0 to 20, telemetry disclosed with an opt-out (local software), or subprocessors and data locations disclosed (hosted).

The other half of Transparency and trust is the provenance score, computed from checked facts (below). The category score is the mean of the two.

Provenance checks not met in full (half of this category, computed from checked facts):

- Terms of service: published, but our reader couldn't read it (7 of 10)
- security.txt: not found (0 of 10)

## Deductions

Each comes off the total. A fixed and documented problem counts for less at the next check.

- 8 April 2026. Storyblok fixed a flaw where the Webhook and Webhook Logs endpoints of the Management API didn't enforce the Admin and Owner restriction the UI applies, so Editor and Restricted roles could manage webhooks by API. It was fixed and disclosed in the changelog, so the deduction is small (https://www.storyblok.com/cl/2026-april-security-fix-webhook-api-now-aligned-with-ui-access-controls).

## What we couldn't check

What we couldn't read counted as absent. Publishing it on a page a plain HTTP fetch can read (not only in a browser) lets the next check count it.

- unchecked: MCP tool input schemas and annotations, which need a signed-in session
- unchecked: the Management API's OpenAPI spec, which sits in the private storyblok/openapi-wdx repository
- unchecked: written incident history on the status page beyond the last seven days. The 90-day uptime bars were readable
- unchecked: whether CI passes on the default branch of storyblok/monoblok
- Not established whether the MCP server's OAuth flow works on every plan. The 5 August 2026 changelog entry describes OAuth scoped grants for custom integrations as Premium and Enterprise, and the MCP setup page names no plan
- Not established whether 429 responses carry a Retry-After header. The official client's README says it honours one, and the API docs don't mention it
- Not established when the MCP server launched. Its docs page was last updated on 29 September 2026 and the changelog feed has no entry for it

## Weaknesses

- The Management API's OpenAPI spec sits in a private repository. Only the Content Delivery API has a public spec (OpenAPI 3.1, 14 operations)
- Management API limit is 3 requests a second on Starter and 6 on paid plans, with no idempotency keys in the reviewed documentation
- The status page monitors four delivery services and has no Management API or MCP monitor
- On 8 April 2026 Storyblok fixed webhook endpoints that had let Editor and Restricted roles manage webhooks through the API
- Version history is kept for 1 day on Starter and 30 days on Growth, so a rollback depends on the plan

## What costs an agent a turn today

The notes we give agents before they call it. Each one is a workaround an agent shouldn't need.

- Pick the base URL by the space's region (mapi.storyblok.com for the EU, api-us, api-ca or api-ap otherwise). A token sent to the wrong region fails
- Create stories without `publish` to keep them as drafts, then call the publish endpoint. It is a GET, so never prefetch or blindly retry it
- Write translations as `field__i18n__<code>` keys inside the same content object, and set the component field to translatable first
- Upload an asset in three steps (signed response, POST to S3, finish upload). Through MCP the S3 step needs shell access for curl
- Stay under 3 calls a second on Starter and 6 on paid plans, and back off exponentially on 429. Saves that break a field's max_length return 422

## When it's done

Send what changed and where it's published as a dispute (https://www.anchorterminal.com/builders/#disputes, or `POST https://www.anchorterminal.com/api/v1/contact` with `"kind": "dispute"`). Disputes are answered in public, and the listing is checked again by the same checklist. Paying for an audit or a listing claim changes nothing here.