GrantSonar
REMOTE · GRANTSONAR.COM · SCANNED SEP 22
Search verified-open US grants (federal, state, foundation). Read-only MCP for AI agents.
Available components
Recent critical change
Authorization (20 Sept 2026). See the changelog before you install this server.
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. How we score → Why this is hard to score →
Endpoint Security63
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- Authorisation check failed: no authorisation is required to call this server, and it exposes a tool marked destructive (dismiss_grant). See how to fix → View diagnostics → Fail
- HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
- The HSTS (Strict-Transport-Security) header is present. View diagnostics → Pass
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability86
- 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).Pass
- AI-judged instruction clarity (excellent).Pass
- Tool/resource definitions use about 967 tokens (~80/item across 12 items; 9 tools + 3 resources), lean.Pass
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management100
- No destabilizing schema changes in the last 30 days.Pass
Tool Coverage100
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 100% of tool parameters carry a description.Pass
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 9 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 11 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities40
- Spec-recency check failed: implements MCP spec 2025-03-26; the latest is 2026-07-28. See how to fix → Fail
How do I install the GrantSonar MCP server?
GrantSonar is a hosted endpoint at https://grantsonar.com/api/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.
remote · grantsonar.com
claude mcp add --transport http romulusfoundry-grantsonar 'https://grantsonar.com/api/mcp'
{
"mcpServers": {
"romulusfoundry-grantsonar": {
"url": "https://grantsonar.com/api/mcp"
}
}
} {
"servers": {
"romulusfoundry-grantsonar": {
"type": "http",
"url": "https://grantsonar.com/api/mcp"
}
}
} [mcp_servers.romulusfoundry-grantsonar] url = "https://grantsonar.com/api/mcp"
{
"$schema": "https://opencode.ai/config.json",
"mcp": {
"romulusfoundry-grantsonar": {
"type": "remote",
"url": "https://grantsonar.com/api/mcp",
"enabled": true
}
}
} openclaw mcp add romulusfoundry-grantsonar --url 'https://grantsonar.com/api/mcp' --transport streamable-http
mcp_servers:
romulusfoundry-grantsonar:
url: "https://grantsonar.com/api/mcp" {
"McpServers": {
"romulusfoundry-grantsonar": {
"Transport": "http",
"Url": "https://grantsonar.com/api/mcp"
}
}
} assistant mcp add romulusfoundry-grantsonar -t streamable-http -u 'https://grantsonar.com/api/mcp'
{
"mcpServers": {
"romulusfoundry-grantsonar": {
"type": "http",
"url": "https://grantsonar.com/api/mcp"
}
}
} The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 20 Sept 26 +45
- Authorization: unverified → fail ▼ critical
- Injection markers: unverified → pass ▲ security
- Stability: unverified → pass ▲ security
- MCP protocol: unverified → fail ▼ functional
- Endpoint reachability: behind authorisation → reachable ▲ functional
- Schema quality: unverified → 100 ▲ functional
- Tool coverage: unverified → 100 ▲ functional
- 27 Aug 26 −45
- Endpoint reachability: reachable → behind authorisation ▼ security
- Stability: pass → unverified ▼ security
- Tool safety: pass → unverified ▼ security
- Authorization: fail → unverified ▼ security
- Capabilities: fail → unverified ▼ functional
- Tool coverage: 100 → unverified ▼ functional
- Schema quality: 100 → unverified ▼ functional
- 26 Aug 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 25 Aug 26 +1
- Stability: 0.97 → pass security
- 11 Aug 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 31 Jul 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 30 Jul 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 27 Jul 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 22 Sept 2026 · Probed https://grantsonar.com/api/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=grantsonar.com | CN=YE2,O=Let's Encrypt,C=US | 11 Sept 2026 | 10 Dec 2026 | ECDSA 256 | ECDSA-SHA384 | 57455fafc08c29e49eeb7bea99e43e8a80c |
| SANs: *.grantsonar.com, grantsonar.com | ||||||
| CN=YE2,O=Let's Encrypt,C=US (CA) | CN=Root YE,O=ISRG,C=US | 3 Sept 2025 | 2 Sept 2028 | ECDSA 384 | ECDSA-SHA384 | 4df3b15dd6c0784c507cd37b58e6f115 |
| CN=Root YE,O=ISRG,C=US (CA) | CN=ISRG Root X2,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | ECDSA 384 | ECDSA-SHA384 | 872165fc34b6e5fba8add5b3705fb53a |
| CN=ISRG Root X2,O=Internet Security Research Group,C=US (CA) | CN=ISRG Root X1,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | ECDSA 384 | SHA256-RSA | 6c8f1dc727c7117f7baf853ac980f9cd |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of grantsonar.com. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| com. | present | 19718 | 13 | Verified |
| grantsonar.com. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication No authorisation required
The endpoint answered without asking for a token. Anyone who knows the URL can reach it.
| Result | No authorisation required |
|---|---|
| HTTP status | 200 |
| Header | Value |
|---|---|
| strict-transport-security | max-age=63072000 |
| content-security-policy | default-src 'self'; script-src 'self' 'unsafe-inline' https://js.stripe.com https://va.vercel-scripts.com; style-src 'self' 'unsafe-inline'; img-src 'self' data: https:; font-src 'self' data:; connect-src 'self' https://*.supabase.co https://api.stripe.com https://generativelanguage.googleapis.com https://api.resend.com https://vitals.vercel-insights.com https://va.vercel-analytics.com https://us.i.posthog.com https://us-assets.i.posthog.com; frame-src https://js.stripe.com https://www.youtube-nocookie.com https://www.youtube.com; frame-ancestors 'none'; form-action 'self'; base-uri 'self'; object-src 'none' |
| x-content-type-options | nosniff |
| x-frame-options | DENY |
| referrer-policy | strict-origin-when-cross-origin |
| permissions-policy | camera=(), microphone=(), geolocation=() |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://grantsonar.com/api/mcp | Verified | 200 | |
| http (plaintext) | http://grantsonar.com/api/mcp | HTTPS enforced | 308 | https://grantsonar.com/api/mcp |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
dismiss_grant ~60
Dismiss a grant from YOUR active feed, or restore it (dismissed=false). Reversible. Requires your API key.
| Name | Type | Req | Description |
|---|---|---|---|
| dismissed | boolean | – | true = dismiss (default), false = restore. |
| grant_id | string | yes | Grant UUID. |
No output schema declared.
No examples provided.
draft_application_section ~141
Generate an AI first-draft for one section of YOUR application, grounded in the funding notice and your org profile, and save it into that section (prior content snapshotted first). Requires a paid API key. This is the only tool that runs the grant writer, so it is metered heavily. Returns the drafted text. Use get_my_application for section_keys.
| Name | Type | Req | Description |
|---|---|---|---|
| application_id | string | yes | Application UUID. |
| document_type | string | – | Draft a short Letter of Inquiry ("loi") or a full section ("full"). Defaults to the application's submission stage. |
| section_key | string | yes | Which section to draft (see get_my_application). |
No output schema declared.
No examples provided.
get_grant ~59
Fetch the full detail of a single grant opportunity by its GrantSonar grant_id (UUID), including synopsis, eligibility, deadlines, and award amounts.
| Name | Type | Req | Description |
|---|---|---|---|
| grant_id | string | yes | GrantSonar grant UUID (from a search_grants result). |
No output schema declared.
No examples provided.
get_my_application ~61
Fetch one of YOUR grant applications (status + every section draft) by application_id or grant_id. Requires your API key.
| Name | Type | Req | Description |
|---|---|---|---|
| application_id | string | – | Application UUID. |
| grant_id | string | – | Grant UUID — resolves your application for that grant. |
No output schema declared.
No examples provided.
list_my_applications ~34
List YOUR organization's grant applications (id, grant title, status, document type, last updated). Requires your API key.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
list_my_matches ~97
List YOUR organization's scored grant matches — the same personalized matches shown on your GrantSonar dashboard. Requires your API key. Returns match tier, score, reasons, pipeline status, and a URL per grant.
| Name | Type | Req | Description |
|---|---|---|---|
| limit | integer | – | Max results (default 25). |
| tier | string | – | Optional: only return matches in this tier. |
| view | string | – | Which list (default "matches" = your active personalized feed). |
No output schema declared.
No examples provided.
save_grant ~71
Save a grant to YOUR pipeline, or set its status to pursuing/applied. Reversible. Requires your API key. Mirrors the dashboard Save button.
| Name | Type | Req | Description |
|---|---|---|---|
| grant_id | string | yes | Grant UUID (from list_my_matches or search_grants). |
| status | string | – | Pipeline status (default "saved"). |
No output schema declared.
No examples provided.
search_grants ~121
Search open grant opportunities in the GrantSonar corpus (federal, state, and foundation grants). Uses semantic similarity over a plain-English description of the project or need, with a keyword fallback. Returns title, agency, deadline, award amounts, similarity score, and a GrantSonar URL per hit.
| Name | Type | Req | Description |
|---|---|---|---|
| limit | integer | – | Maximum number of results (1-25, default 10). |
| query | string | yes | Plain-English description of the project, organization, or funding need (e.g. "after-school STEM programs for rural Missouri students"). |
No output schema declared.
No examples provided.
update_application_section ~131
Write content into one section of YOUR grant application (replace or append). Requires your API key. The prior draft is snapshotted to version history first, so this is recoverable. Use get_my_application to see section_keys.
| Name | Type | Req | Description |
|---|---|---|---|
| application_id | string | yes | Application UUID (from list_my_applications). |
| content | string | yes | The text/HTML to write into the section. |
| mode | string | – | replace (default) overwrites; append adds to the end. |
| section_key | string | yes | Which section to write (e.g. "statement_of_need"). See get_my_application. |
No output schema declared.
No examples provided.
What is the GrantSonar MCP server?
GrantSonar is an MCP server listed in the public MCP registry as io.github.romulusfoundry/grantsonar. Search verified-open US grants (federal, state, foundation). Read-only MCP for AI agents. This page covers its hosted endpoint (https://grantsonar.com/api/mcp).
Is the GrantSonar MCP server safe to use?
GrantSonar scores 80 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 GrantSonar MCP server expose?
GrantSonar exposes 9 tools: search_grants, get_grant, list_my_matches, get_my_application, list_my_applications, and 4 more. Their descriptions and schemas cost roughly 775 tokens of context every time the server is loaded.
Does the GrantSonar MCP server require authentication?
No. We connected to GrantSonar without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the GrantSonar MCP server still maintained?
GrantSonar is still listed as active in the MCP registry. We last reached this channel on 22 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.