@bounded-systems/site-mcp

A local, read-only MCP server (and a matching CLI) over robertdelanghe.dev's signed static API.

It exposes the site's identity data — profile, writing, the GitHub corpus, the résumé credential, the OpenAPI doc — to any MCP client (Claude Desktop, Claude Code, etc.), and verifies every response byte-for-byte against the site's Sigstore-signed sha256 manifest before handing it back. If the bytes a client would receive don't match the signed manifest, it refuses to return them.

It runs locally over stdio — the client spawns it as a subprocess. There is no hosted server and no network listener, which preserves the site's static / no-attack-surface posture.

A thin implementation of a generic core

This package is now thin. All of the reusable machinery — the verifying fetch client, the sha256 manifest + Sigstore checks, and the VerbSpec → MCP (tools + resources) / VerbSpec → CLI projection — lives in @bounded-systems/static-mcp. site-mcp supplies only:

• the verbs (src/verbs.ts) — list_posts, get_post, get_conformance, each authored once as a @bounded-systems/verbspec VerbSpec;
• the resource catalog (src/catalog.ts) — the site://… resources;
• the config values (src/config.ts) — the origin and expected signer identity; and
• the entry (src/index.ts) — which picks a surface and hands the spec to the core.

src/verbs.ts ─┐
src/catalog.ts ├─▶ buildSiteSpec(config) ─▶ @bounded-systems/static-mcp
src/config.ts ─┘        serveVerifiedStaticMcp(spec, config)   (MCP, stdio)
                        runStaticCli(spec, config, argv)        (CLI)

Two surfaces, one definition. verbspec projects each verb to both an MCP tool and a CLI subcommand. The exact same verb set backs site-mcp's MCP tools and its CLI commands — no second definition, no drift.

Install / run

Requires Node ≥ 18.17. site-mcp's verbspec dependency is published to JSR, so installs resolve it through JSR's npm bridge — the included .npmrc sets @jsr:registry=https://npm.jsr.io. (Consuming from a fresh environment, add that one line to your npm config.)

# MCP server over stdio (what an MCP client launches):
npx -y @bounded-systems/site-mcp

# CLI — the SAME verbs, printing the verified JSON:
npx -y @bounded-systems/site-mcp list_posts
npx -y @bounded-systems/site-mcp get_conformance
npx -y @bounded-systems/site-mcp get_post agent-authored-code-drift

The MCP server logs a readiness line to stderr (stdout is the MCP channel):

site-mcp ready (stdio) → https://robertdelanghe.dev; signature mode=off

MCP client configuration

{
  "mcpServers": {
    "robertdelanghe": {
      "command": "npx",
      "args": ["-y", "@bounded-systems/site-mcp"],
      "env": { "SITE_MCP_SIGNATURE_MODE": "warn" }
    }
  }
}

Resources

| Resource URI | Endpoint | Contents | | ----------------------- | ------------------------- | -------- | | site://profile | profile.json | Headline, intro, label, links | | site://posts | posts.json | JSON Feed of writing (post list) | | site://post/{slug} | posts/{slug}.json | A single post (templated; list enumerates from the feed) | | site://corpus | corpus.json | GitHub corpus: stats + highlights | | site://conformance | conformance.json | Per-page DOM conformance report | | site://resume-vc | resume.vc.json | Résumé as a Verifiable Credential | | site://openapi | openapi.json | The OpenAPI 3.2 document for the API |

Tools / CLI commands (read-only)

The same three verbs, on both surfaces:

| Tool / command | Args | Returns | | ---------------- | --------------- | ------- | | list_posts | — | The posts feed (slug, title, summary, tags) | | get_post | slug | A single post by slug | | get_conformance| — | The conformance / accessibility report |

Resource reads and tool results carry a _meta.verification block (the manifest-relative path, source URL, the verified sha256, and the manifest signature status). The CLI prints the verified JSON; a verification failure exits non-zero with nothing on stdout.

Verification / trust model

The site publishes a single signed manifest, https://robertdelanghe.dev/site.sha256 (sha256sum format), and a Sigstore bundle over it, site.sha256.sigstore.json. The core enforces:

1. Per-file hash check (always on). Fetch the manifest once per process; for every resource, fetch it, SHA-256 the received bytes, and require that digest to equal the manifest entry. A tampered file, a stale CDN edge, or a MITM → mismatch → VerificationError instead of a response. A path absent from the manifest is likewise refused.
2. Manifest signature check (optional). SITE_MCP_SIGNATURE_MODE=warn|require verifies the Sigstore bundle against the deploy workflow identity (…/bdelanghe/site/.github/workflows/deploy.yml@refs/heads/main).

Sigstore backend / @bounded-systems/verify. The optional manifest-signature step is intended to delegate to @bounded-systems/verify, the canonical in-process bundle verifier. As of [email protected] that package ships as a self-executing CLI with no exported function (importing it runs and exits the process), so the core keeps a minimal, behaviorally-identical copy of the check and the gap is filed upstream. See static-mcp's README.

Configuration

| Variable | Default | Meaning | | ---------------------------- | ------- | ------- | | SITE_MCP_BASE_URL | https://robertdelanghe.dev | Origin serving the site + API + manifest | | SITE_MCP_SIGNATURE_MODE | off | off | warn | require | | SITE_MCP_SIGNER_IDENTITY | deploy workflow SAN | Expected Sigstore certificate identity | | SITE_MCP_SIGNER_ISSUER | GitHub Actions OIDC | Expected Sigstore OIDC issuer | | SITE_MCP_FETCH_TIMEOUT_MS | 15000 | Per-request fetch timeout |

Development

npm install         # resolves @bounded-systems/static-mcp (npm) + verbspec (JSR bridge)
npm run build       # tsc → dist/
npm test            # node --test via tsx (server + CLI; no network)
npm run typecheck

Publishing

One tag publishes the same version to three registries, mirrored. Pushing a v* tag runs publish.yml, which fans out to:

| # | Registry | Identifier | Auth | | - | -------- | ---------- | ---- | | 1 | npm | @bounded-systems/site-mcp | trusted publishing (OIDC) + provenance | | 2 | JSR (mirror) | @bounded-systems/site-mcp | tokenless OIDC (npx jsr publish) | | 3 | MCP Registry | io.github.bounded-systems/site-mcp | GitHub-OIDC namespace auth (mcp-publisher) |

There are no long-lived secrets — every registry authenticates with the job's short-lived GitHub Actions OIDC token (id-token: write). npm needs npm ≥ 11.5 (the workflow upgrades npm to guarantee this).

[!IMPORTANT] Versions must stay in sync. The release version lives in four places that must all match: package.json, deno.json, server.json, and the v<version> git tag. The workflow's verify job hard-fails the whole release on any mismatch, so npm and JSR can never drift apart. The MCP Registry also requires package.json to carry "mcpName": "io.github.bounded-systems/site-mcp" (it reads that field off the published npm package to prove ownership).

The MCP Registry job runs after the npm job, because the registry verifies ownership by reading mcpName from the freshly-published npm package.

One-time setup (maintainer) — do these BEFORE the first tag

These three registry-side authorizations only need to happen once. Two of the three (JSR, MCP Registry) are pure repo-link / OIDC — no tokens are minted.

(a) npm — Trusted Publisher (on npmjs.com)

1. Sign in as an owner of the @bounded-systems scope.
2. Open the package page for @bounded-systems/site-mcp → Settings → Trusted Publisher. For a brand-new package you may need to publish 0.1.0 once manually (or create the package), then switch to trusted publishing.
3. Choose GitHub Actions and enter:
   • Organization / user: bounded-systems
   • Repository: site-mcp
   • Workflow filename: publish.yml ← (was publish-npm.yml)
   • Environment: (leave blank)
4. Save. No token is generated or stored anywhere. Ensure the package's publishing-access policy allows automation/OIDC (trusted publishers satisfy 2FA).

(b) JSR — create + link the package (on jsr.io)

1. Sign in to jsr.io with GitHub and create the package @bounded-systems/site-mcp under the @bounded-systems scope.
2. Open the package's Settings tab → under GitHub Repository enter bounded-systems/site-mcp and click Link. Linking the repo is what enables tokenless OIDC publishing from this workflow (same idea as npm's trusted publisher). No token is created.

(c) MCP Registry — nothing to pre-authorize

The io.github.bounded-systems/* namespace is auto-authorized via GitHub OIDC: because this repo lives under github.com/bounded-systems, mcp-publisher login github-oidc proves ownership of the namespace from the Actions run itself. There is no registry-side claim/consent/linking step to do in advance — the first publish.yml run authenticates and registers the server on its own. (Package-ownership of the npm entry is proven separately by the mcpName field; see the note above.)

Cut a release (the single command)

# 1. Bump the version in ALL of: package.json, deno.json, server.json
#    (and the package entry in server.json). Commit.
# 2. Tag with the SAME version and push — this is the only command:
git tag v0.1.0 && git push origin v0.1.0

That one v* tag triggers publish.yml → npm + JSR + MCP Registry, all at the same version. You can also run it from the Actions tab via workflow_dispatch (which reuses the package.json version in place of a tag).

Local dry-runs (verify without publishing)

npm pack --dry-run                                   # npm tarball contents
npx --yes jsr publish --dry-run --allow-slow-types   # JSR (or: deno publish --dry-run --allow-slow-types)
mcp-publisher validate ./server.json                 # MCP Registry schema check

site-mcp depends on @bounded-systems/static-mcp; publish the core first (its own v* tag → JSR + npm), then cut site-mcp's tag.

License

MIT — see LICENSE. The site data itself is published under CC BY 4.0.