A reference guide for saving Squarespace page content through an application programming interface, which lets software read and update site data.

It is for agents working with the Squarespace Content Save API, including reading sections, updating blocks, and preserving required layout fields.

It documents the required session checks and read-modify-write process, reducing errors when changing page sections.

How timncox/squarespace-mcp configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to timncox/squarespace-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/timncox/squarespace-mcp/main/.claude/agents/squarespace.md

Clone the repo

git clone --depth 1 https://github.com/timncox/squarespace-mcp

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/agents/timncox/squarespace-mcp/squarespace/github.svg)](https://agentmods.dev/agents/timncox/squarespace-mcp/squarespace)

Your own site

<a href="https://agentmods.dev/agents/timncox/squarespace-mcp/squarespace"><img src="https://agentmods.dev/badge/agents/timncox/squarespace-mcp/squarespace/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/agents/timncox/squarespace-mcp/squarespace"><img src="https://agentmods.dev/badge/agents/timncox/squarespace-mcp/squarespace.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 3,870 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00000	$0.03870
Opus 5.5	$0.00000	$0.01548
Sonnet 5.5	$0.00000	$0.00774
Haiku 4.5	$0.00000	$0.00387

Measured 2mo ago against content hash 65d309d8f93c, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

squarespace scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.claude/agents/squarespace.md · 272 lines

How it starts

The opening of the file, as written. The whole thing — 272 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Squarespace Content Save API — Agent Reference

Reference for agents working with the Squarespace API layer. All methods are on ContentSaveClient in src/services/content-save.ts. Types in src/services/content-save-types.ts.

Authentication

Session file: storage/auth/sqsp-session.json (Playwright session export)
Crumb token: Extracted from site-specific cookies (NOT account.squarespace.com)
Pre-flight: ContentSaveClient.checkSessionHealth() — checks existence, age, crumb
Factory: createContentSaveClient(subdomain) — loads cookies automatically
Sessions work 90+ hours but warn after 24h

Read-Modify-Write Pattern

All block/section modifications follow this pattern:

1. GET  /api/page-sections/{pageSectionsId}          → read current sections
2. Modify sections JSON in memory
3. PUT  /api/page-sections/{pageSectionsId}/collection/{collectionId}  → save

CRITICAL: PUT validates ALL blocks. Missing verticalAlignment or zIndex on ANY block causes 400 errors. Always backfill before PUT:

for (const gc of section.gridContents) {
  if (gc.layout?.desktop && !gc.layout.desktop.verticalAlignment) {
    gc.layout.desktop.verticalAlignment = 'top';
  }
  if (gc.layout?.desktop && gc.layout.desktop.zIndex == null) {
    gc.layout.desktop.zIndex = 0;
  }
}

Block Type Reference

Type ID	Name	Add Method	Update Method	Find-By Strategy
2	Text	`addTextBlock()`	`updateTextBlock()` / `patchTextBlock()`	Stripped HTML text match
18	Menu	—	`updateMenuBlock()`	Raw text, tab/section/item titles
23	Code	`addCodeBlock()`	`updateCodeBlock()`	Code content match
44	Quote	`addQuoteBlock()`	`updateQuoteBlock()`	Quote text / attribution
46	Button (legacy)	`addButtonBlock()`	`updateButtonBlock()`	Label text match
1337	Button (new)	`addButtonBlock()`	`updateButtonBlock()`	`buttonText`/`buttonLink` match (definitionName: `website.components.button`)
1337	Image	`addImageBlock()` / `addImageBlockBatch()`	`updateImageBlock()`	title/description/altText
8	Gallery	—	—	—
52	Divider	`addDividerBlock()`	—	—
50	Video	`addVideoBlock()`	`updateVideoBlock()`	title/url match

Read the full file on GitHub · 272 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2mo ago First seen · 272 lines · 0 tokens per session scan A 65d309d8f93c

Subscribe to this mod's changes

squarespace is an agent published in the GitHub repository timncox/squarespace-mcp (8 stars, last pushed 3d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 3,870 tokens. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Backend and APIs

squarespace next to 6 agents from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
squarespacetimncox/squarespace-mcp	Agent	8	3d ago	MIT	A	0	Claude Code
php-developerdavepoon/buildwithclaude	Agent	3.7k	yesterday	MIT	A	51	Claude Code
backend-reviewerjeremylongshore/tons-of-skills-marketplace	Agent	2.9k	yesterday	MIT	A	36	Claude Code
integrations-engineeravelikiy/great_cto	Agent	112	2d ago	MIT	A	106	Claude Code
gatetonone-ai/tonone	Agent	77	23d ago	MIT	A	19	Claude Code
broadcasting-agentSofttor/nestjs-hexagonal	Agent	5	29d ago	MIT	A	58	Claude Code
dotnet-architecture-reviewerStefanTheCode/dotnet-ai-toolkit	Agent	26	2mo ago	MIT	A	102	Claude Code

squarespace-mcp: Agent for Claude Code