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io.github.lonniev/excalibur-mcp

io.github.lonniev/excalibur-mcp · v0.40.2

FastMCP server for posting formatted content to X (Twitter) — Tollbooth-monetized, DPYC-native

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Last check

Reachable, 87 tools, protocol 2025-06-18 · checked 2026-10-17

Test & rating

A 95/100

What it does: 87 tools · 41 read, 46 write (incl. delete/pay)

Test call excalibur_service_status: worked (4,218 ms)

How the rating is made
  • Answers without login: +30
  • Speed of first answer: +10
  • Lists tools: +10
  • Tool descriptions: +15
  • Parameter descriptions: +10
  • Read/write annotations: +5
  • Safe test call: +20
  • More than 80 tools: -5

Tested 2026-10-17. Fixed rules, no AI model. Grade A needs a successful real call.

Install

Remote URL
https://excalibur-mcp.fastmcp.app/mcp

Tools

87 tools listed at last check
  • excalibur_check_balance Check a patron's credit balance at this operator. This is the patron's spending balance — credits purchased via Lightning for tool calls at this operator. For the operator's own balance at the Authority (needed to certify patron purchases), use authority_check_balance instead. Free — no credits re
  • excalibur_purchase_credits Buy credits via Bitcoin Lightning. Creates a Lightning invoice. Pay it with any Lightning wallet, then call check_payment to confirm. Proof of npub ownership is required so credits land in the correct ledger. Free — no credits required to call.
  • excalibur_check_payment Check the payment status of a Lightning invoice. Call after paying the invoice from purchase_credits. Free — no credits required. Proof of npub ownership is required to prevent credit-grant front-running by an observer of the invoice ID.
  • excalibur_restore_credits Credit a patron's ledger from a BTCPay-settled invoice. **RESTRICTED to the operator** — the operator owns the books and is the only party who can issue a manual credit grant. Patrons who believe they paid but never got credits must escalate to the operator's support, who then invokes this tool on
  • excalibur_account_statement Generate a patron's account statement at this operator. Returns the patron's purchase history, active credit tranches, per-tool usage breakdown, and recent daily usage logs. This is the patron's spending account — not the operator's Authority tax balance. Free — no credits consumed. Proof of npub
  • excalibur_account_statement_infographic Generate a visual SVG infographic of your account statement. Returns the same data as account_statement, rendered as a dark-themed SVG graphic with balance hero, metrics cards, health gauge, tranche table, and tool usage breakdown. Costs 1 api_sat per call. Proof is verified by ``debit_or_deny`` be
  • excalibur_report_issue File a field report about this service as a GitHub issue on the operator's repo. Found a tool's metadata or response wrong or confusing? Report it where the tool lives. The **author of record is your npub** — no npub / no proof, no issue — and it is stamped into the issue so the report is attribute
  • excalibur_service_status Check the health and configuration of this service. Free.
  • excalibur_request_echo Echo what the client sent with this request. Free. Reports the URL path and query, the headers, the cookies and the MCP request ``_meta``. Values are SHA-256 fingerprints, so nothing a client sends is repeated back; equal fingerprints mean equal values. Call it from two conversations and compare: a
  • excalibur_get_operator_onboarding_status Report this operator's configuration readiness. Shows which operator settings are configured, which are missing, and how to deliver each missing value. For patron-level credential status, use get_patron_onboarding_status instead. Free.
  • excalibur_get_patron_onboarding_status Report a patron's credential readiness for this operator. For set-once services (eXcalibur, TheBrain), shows which patron secrets are configured and which are missing. For dynamic/OAuth2 services (Schwab), reports that no patron credentials are needed. Free. Proof of npub ownership is required beca
  • excalibur_session_status Check operator readiness. Returns the operator lifecycle state and clear guidance on what to do next. Free. Lifecycle states: - ready: Vault AND pricing model verified on this call. Proceed with tool calls — this is the answer the moment the vault is up. - warming_up: Persistence could not be rea
  • excalibur_request_credential_channel Open a Secure Courier channel for credential delivery. This is the CREDENTIAL-DELIVERY flow — use it to hand over a service secret (API keys, tokens). To merely prove you control an npub (the usual answer to a ``proof_required`` error), use ``request_npub_proof`` instead. Note: dynamic/OAuth2 servi
  • excalibur_receive_credentials Pick up credentials from the Secure Courier. Completes the CREDENTIAL-DELIVERY flow (the ownership-proof counterpart is ``receive_npub_proof``). **Call this only after the user confirms they have replied.** Deterministic, one-shot retrieval: name the response you want with ``(sender_npub, service,
  • excalibur_forget_credentials Delete vaulted credentials for a specific service and npub. For operator credentials, pass the operator's own npub. For patron credentials, pass the patron's npub. Always requires proof of npub ownership — a deletion is as destructive as a write.
  • excalibur_update_patron_credential Add or update a single patron credential field. Merges into existing stored credentials without affecting other fields. Useful for setting an account identifier after OAuth, changing a default brain, etc. Free. Proof of npub ownership is required — this is a write to the patron's sensitive credenti
  • excalibur_update_operator_credential Add or update a single operator secret field. Merges into the operator's stored credentials without touching the others — the field-level counterpart to re-delivering the whole bundle over Secure Courier. Use it to rotate one secret (a reissued ``btcpay_api_key``, say) without restating the six you
  • excalibur_delete_patron_credential Remove a single patron credential field. Deletes one field from stored credentials without affecting other fields. Free. Proof of npub ownership is required — this is a write to the patron's sensitive credential vault.
  • excalibur_delete_operator_credential Remove a single operator secret field. Deletes one key from the operator's encrypted credential blob without touching the others — the field-level counterpart to ``forget_credentials``, which wipes the whole row. Use it to retire a leftover after an SDK cutover (a Prefect key after Modal, or a stor
  • excalibur_get_patron_credential_fields List stored patron credential field names (not values). Returns the names of fields stored for a patron, plus each field's ``delivered_at`` ISO-8601 timestamp when known (null for secrets vaulted before timestamps were recorded). Values are never exposed — use this to verify which fields are config
  • excalibur_begin_oauth Start the OAuth2 authorization flow. Returns an authorization URL. Open it in a browser to log in and authorize. Then call ``check_oauth_status`` with the same npub to complete. Free. Proof of npub ownership is required so an observer cannot DOS your account by initiating OAuth flows in your name.
  • excalibur_check_oauth_status Check whether the OAuth2 authorization flow has completed. Call after opening the authorization URL from ``begin_oauth`` and completing the login in your browser. Free. Proof of npub ownership is required: OAuth status exposes which upstream services a patron has connected. A 'pending' result here
  • excalibur_request_npub_proof Request npub ownership proof from a patron via Nostr DM. This is the npub-OWNERSHIP-PROOF flow — use it when a call returns ``proof_required``. It proves the caller controls an npub; it does NOT deliver any service secret. To hand an operator its API keys or OAuth secrets, use ``request_credential_
  • excalibur_receive_npub_proof Receive npub ownership confirmation from a patron. Completes the npub-OWNERSHIP-PROOF flow (the credential-delivery counterpart is ``receive_credentials``). **Call this only after the user confirms they have replied.** Deterministic, one-shot retrieval: name the response with ``(patron_npub, dpop_
  • excalibur_check_proof_status Check whether a proof grant is still valid. Mirrors ``check_oauth_status`` for the npub-proof flow: a calling agent can ask "will my next paid call accept this dpop_token?" before burning credits on a guaranteed failure. Expiry is read from the grant itself; the only store consulted is the patron's
  • excalibur_oracle_how_to_join Get DPYC onboarding instructions from the Oracle. Free.
  • excalibur_oracle_get_tax_rate Get the current DPYC certification tax rate. Free.
  • excalibur_oracle_lookup_member Look up a DPYC community member by npub. Free.
  • excalibur_oracle_about Describe the DPYC ecosystem via the Oracle. Free.
  • excalibur_oracle_network_advisory Get active network advisories from the Oracle. Free.
  • excalibur_check_authority_balance Check this operator's tax balance at the Authority. Returns the sats available for certifying patron credit purchases. When this balance reaches zero, patron top-ups cannot be certified and the operator must call purchase_credits on the Authority. This is the operator's own funding — not a patron
  • excalibur_get_pricing_model Get the active pricing model for this operator. Free. If no model exists, self-initializes a scaffold with all registered tools at 0 sats. No economic data from code.
  • excalibur_set_pricing_model Set the active pricing model. RESTRICTED to operator. Requires a valid proof (Schnorr-signed kind-27235 event) proving the caller holds the operator's nsec.
  • excalibur_reset_pricing_model Erase all pricing models and restore a viable default. Deletes every stored model, then self-initializes a fresh one from the tool registry — all tools at 0 sats with proper UUIDs. Returns the new model. RESTRICTED to operator — requires proof (nsec-signed).
  • excalibur_request_adoption Ask a chosen Authority to adopt this operator (deferred courtship). RESTRICTED to the operator — requires proof the caller controls this operator's npub. Resolves the Authority's MCP endpoint from the community registry, mints an inline ownership proof with this operator's nsec, and delivers the re
  • excalibur_adoption_status Check this operator's adoption-request status at a chosen Authority. Free. Polls the Authority MCP-to-MCP for the status of this operator's request (pending / approved / rejected / provisioned).
  • excalibur_restore_neon_schema Prepare this operator's database schema again, ignoring the breadcrumb. Diagnostic / recovery tool for when Neon keeps answering 4xx and the operator suspects a table or grant is missing. Every statement is idempotent, so a clean re-run is harmless; the breadcrumb is rewritten at the end. Returns o
  • excalibur_list_canonical_identities Return canonical (tool_id, mcp_name, …) for every tool the wheel exposes. The authoritative source for any client (Studio, agents, FE) that needs to know how this MCP identifies its tools. Reconcile uses this output to UUID-join against the stored pricing model — no name-based UUID derivation, no g
  • excalibur_get_nostr_profile Read an npub's public Nostr profile (NIP-01 kind-0 metadata). Free, no proof — the data is already public on relays. Returns the latest metadata fields (name, display_name, about, picture, banner, nip05, website, lud16) or an empty profile if none is published.
  • excalibur_publish_nostr_profile Publish a CLIENT-SIGNED kind-0 profile to relays for an npub. The wheel never holds a patron nsec. The frontend signs the kind-0 metadata event with the patron's session key or a NIP-07 extension and passes the signed event (JSON) here; the wheel verifies the signature matches the npub, then relays
  • excalibur_check_price Preview the effective cost of a tool call. Shows the base cost and any constraint effects (discounts, free trials, surge pricing). Free — no credits required.
  • excalibur_list_constraint_types List all available constraint types and their parameter schemas. Returns the type, category, description, and parameter specs for every constraint that can be used in a pricing pipeline. Free — no credits required.
  • excalibur_mint_coupon Create a new operator-owned discount coupon. The coupon owns its binding: ``tool_ids`` names the tools it discounts, and re-pricing a tool never touches it. A coupon bound to no tool discounts nothing, however many patrons redeem it.
  • excalibur_list_coupons List every coupon this operator has minted (newest first). Each row carries the current ``times_redeemed`` counter — the Studio renders a progress bar from this against ``total_uses``. RESTRICTED to operator — requires proof.
  • excalibur_update_coupon Patch a coupon's editable fields. Pass only the fields you want to change. To set a cap to unlimited (NULL in the schema), pass ``clear_uses_per_patron=true`` or ``clear_total_uses=true``. Renaming the code is allowed — existing patron redemption rows survive (they key on coupon id). ``tool_ids``
  • excalibur_delete_coupon Delete a coupon. Cascades to all patron redemptions. Any chain step referencing the deleted coupon_id becomes a no-op (the constraint returns neutral on unknown ids) — the Studio surfaces orphan references as warnings. RESTRICTED to operator — requires proof.
  • excalibur_redeem_coupon Claim a coupon by its name (the code the operator shared). Looks up the operator's coupon by ``code``, validates the window and total cap, and records a per-patron redemption row. Subsequent paid tool calls on this MCP auto-apply the discount until ``uses_per_patron`` is exhausted. Free — no credi
  • excalibur_list_my_coupons List the coupons this patron has redeemed on this operator. Returns both active and exhausted redemptions with a per-row ``status`` (``active`` / ``window_closed`` / ``patron_limit`` / ``total_limit``). Free — requires proof of ``npub``.
  • excalibur_forget_coupon Remove a coupon from this patron's redemption list. Cosmetic only — the coupon itself still exists at the operator, and the patron can re-redeem the same code later while the window allows. Free — requires proof of ``npub``.
  • excalibur_notarize_ledger Build a Merkle tree of all patron balances and submit the root to Bitcoin via OpenTimestamps. Operator-only background task. Bitcoin confirmation takes 1-6 hours. Free — no credits required.
  • excalibur_get_notarization_proof Generate a Merkle inclusion proof that a patron's balance was included in a Bitcoin-notarized snapshot.
  • excalibur_list_notarizations List recent Bitcoin notarization records.
  • excalibur_post_tweet Post a text tweet with markdown formatting converted to Unicode rich text. Accepts standard markdown inline formatting and converts it to Unicode Mathematical Alphanumeric Symbols that render as styled text on X: **bold** -> bold *italic* -> italic ***bold italic*** -
  • excalibur_get_x_profile Fetch the connected X account's handle and name for this patron (free). Uses the patron's vaulted X OAuth token to call X's ``/users/me``. Returns ``{connected: true, username, name, profile_image_url}`` when connected, or the OAuth situation (``connected`` absent) when X isn't linked yet. Used to
  • excalibur_post_nostr_message Publish a public Nostr note (kind 1) authored by your proven npub. eXcalibur cannot sign a note *as* you — a Nostr event must be signed by the key it claims to come from, and eXcalibur never holds your nsec. So for this one note it mints a fresh, ephemeral "scribe" keypair, signs with it, and ``p``
  • excalibur_post_tweet_image Post a tweet with a hero banner image to X/Twitter. Provide either an image_url (fetched and attached) or banner_svg (rendered to PNG and attached). Text supports the same markdown formatting as post_tweet.
  • excalibur_create_post Store a new post (draft or scheduled). Returns its ``post_id``.
  • excalibur_get_post Read one stored post by id (owner-scoped).
  • excalibur_list_posts List your stored posts, server-side sorted, filtered, and offset-paginated. Optional ``status`` filter — a single status or a comma-separated set (e.g. ``draft,scheduled``), matched as set membership. ``sort_col`` is one of ``created|updated|status|scheduled`` (default ``created``); ``sort_dir`` is
  • excalibur_update_post Patch a stored post. ``patch`` may set ``doc, publish_at, recurrence, cease_at, status`` (omit a field to leave it unchanged). ``text_cache`` is written when supplied (alongside a doc change). ``client_req_id`` dedupes debounced autosave retries — a repeat is a no-op with no second charge.
  • excalibur_delete_post Delete a stored post. Default is a soft delete (``status='archived'``); pass ``hard=True`` to remove the row permanently. The tweet on X, if any, stays where it is.
  • excalibur_list_snippets List your saved post snippets, server-side sorted, filtered, and offset-paginated. ``sort_col`` is one of ``favorite|created|updated|name`` (default ``favorite``); ``sort_dir`` is ``asc|desc``. ``search`` is a case-insensitive regular expression matched against the snippet name or body. ``date_from`
  • excalibur_get_snippet Read one of your saved snippets by id (full row incl. ``doc`` block document). Free and owner-scoped. Returns ``{"success": true, "snippet": …}`` or ``snippet_not_found``.
  • excalibur_save_snippet Save a reusable post snippet (opening/footer/CTA). Omit ``snippet_id`` to create a new one; pass it to update an existing snippet in place (name/text/ favorite/doc). On update only the fields you pass change — omit ``favorite`` (leave it null) to keep it as-is, so a doc-only patch (e.g. toggling a s
  • excalibur_delete_snippet Delete one of your saved snippets by id. Free and owner-scoped.
  • excalibur_find_conversations Search X's last 7 days for people asking something you could answer, score each thread 0..100, and store the result under your npub for ``list_conversations`` to page through. Pass exactly one of ``query_id`` (a saved query from ``save_conversation_query``) or ``query`` (an ad-hoc X search clause —
  • excalibur_reply_to_conversation Post your reply into one of your leads' threads on X (``conversation_id`` is the row id from ``list_conversations``). ``text`` is up to 280 characters; markdown inline formatting is converted the same way ``post_tweet`` does it. Posted with your own X token as a reply to the lead's post; on X's conf
  • excalibur_list_conversations Page through your stored conversation leads, server-side sorted and filtered. ``query_id`` narrows to one saved query (``"adhoc"`` for leads from ad-hoc searches); ``status`` is a comma list of ``new|seen|engaged|dismissed``; ``min_score`` is 0..100. ``sort_col`` is one of ``score|found|seen|posted|
  • excalibur_set_conversation_status Mark one of your leads ``new|seen|engaged|dismissed`` by its row id (the ``id`` from ``list_conversations``, not X's conversation id). A re-run of the search never changes a status you set. Free and owner-scoped.
  • excalibur_list_conversation_queries List your saved conversation queries with their last-run watermarks. Free and owner-scoped. Returns ``{queries:[…]}``.
  • excalibur_save_conversation_query Save a named X search clause to run with ``find_conversations``. Omit ``query_id`` to create; pass it to update in place — only the fields you pass change, and a changed ``query`` resets the last-run watermark. ``weights`` holds only the scoring values you override. At most 50 saved queries per npub
  • excalibur_delete_conversation_query Delete one of your saved conversation queries. The leads it found are kept (they become ad-hoc leads). Free and owner-scoped.
  • excalibur_get_voice Read your saved writing Voice — a profile blurb plus a list of "banned construction" chips (``{text, on}``) the editor passes to ``refine_post_region``. Owner-scoped; priced by the operator's pricing model (use ``check_price``). When you have not saved a Voice yet this returns an empty one (``{"voic
  • excalibur_save_voice Save your writing Voice (replaces the previous one — it is a per-npub singleton). ``profile`` is free text. ``bans`` is a list of ``{text, on}`` objects: ``text`` is the construction to avoid, ``on`` whether it is an active constraint. Blank/duplicate entries are dropped server-side. Owner-scoped; p
  • excalibur_refine_post_region Refine a flagged region of a post with an LLM — server-side. The operator's LLM key stays in the vault and never leaves the server. Send the flagged ``region``, the surrounding ``full_text``, an optional ``instruction`` (what to change), and the editor's ``voice`` profile + ``bans`` (JSON array or
  • excalibur_resolve_dynamic_block Start resolving a dynamic post block with an LLM — returns a CLAIM CHECK. A dynamic block's ``prompt`` is run by the model (with web search + web fetch for live data) and woven into the surrounding post ``context`` in the author's ``voice``. The author's instruction governs length — there is no cha
  • excalibur_fetch_dynamic_block Redeem a ``resolve_dynamic_block`` claim check (free, proof-gated). Poll this with the ``claim_check`` from ``resolve_dynamic_block`` until ``status == "done"`` (the resolved fragment is ``result.text``). While the job runs it returns ``{"status": "running", "poll_after_seconds": N}``; on failure `
  • excalibur_harvest_metrics Operator-only: one cadence-aware metrics harvest sweep. Drains due ``metrics_harvest_job`` rows (t+15m … t+28d), fetches X ``non_public_metrics`` / ``organic_metrics`` under each patron's OAuth context, and appends ``post_metrics_snapshot`` rows. A missed cadence is permanent data loss — failed job
  • excalibur_get_post_metrics Patron: raw metrics snapshot series for one owned post. Returns the append-only ``post_metrics_snapshot`` rows (impressions, likes, clicks, cadence_key, t_offset, link_placement, snippet_ids) ordered by capture time. Empty when the post has not been harvested yet.
  • excalibur_post_performance Patron: derived reach scores across your harvested post corpus. Computes escape velocity (t+15m vs rolling median), breakout ratio (final reach ÷ rolling-median final reach; suppressed below 5 posts), link-placement cohort medians, and snippet/voice attribution from the durable snapshot store — sig
  • excalibur_post_performance_infographic Patron: SVG infographic of post performance (gold-steel theme). Mirrors ``account_statement_infographic`` — a dark-themed SVG of corpus size, median t+15m impressions, top posts, and link-placement cohorts.
  • excalibur_process_scheduled_posts Launch a publisher for every due post (operator-only). Selects ``scheduled`` posts whose ``publish_at`` has arrived, claims each atomically, and starts one background publisher per post. It does NOT publish: composing content, billing the owner, posting to X and recording the outcome all belong to
  • excalibur_get_scheduler_log Read recent scheduler-tick outcomes. Each ``process_scheduled_posts`` run — fired by the Cloudflare cron Worker or a manual trigger — records its summary. This surfaces them so the FE debug log can show what the Worker is doing: the per-tick heartbeat (proof it ran) and per-post outcomes (posted /
  • excalibur_scheduler_pending What is the scheduled-post cron Worker waiting on? (operator-only). When the Worker's authorization lapses it DMs the operator a challenge phrase and parks. This returns that pending phrase so the operator can match it against the DM before approving in Studio — the Device-Grant second surface for
  • excalibur_scheduler_status The scheduler's configuration and current status (free; any proven patron). Relays the cron Worker's public ``/status`` — cadence, version, renewal window, and current authorization phase (``pending`` / ``active`` / ``idle``, no challenge phrase) — and adds the operator npub it acts for. No secrets
  • excalibur_scheduler_check_now Ask the scheduler to run one tick now (free; any proven patron). Pokes the Worker's ``/tick`` — the same work the ~30-minute cron does: it claims a pending proof reply (completing the operator's authorization) and fires any due posts. Use it right after the operator approves in Studio so nobody wai
  • excalibur_scheduler_reissue Send the scheduler's proof request again, now (operator-only). For a pending request that is not going to complete — the reply went to an older DM, or ``scheduler_pending`` shows a last check that says the request was replaced or expired. The Worker drops it and DMs a fresh one straight away instea

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