// MCP TOKEN COST

The Gastos Flow MCP server costs 9,734 tokens before the first call.

Connect Gastos Flow and its 55 tool definitions are loaded into the model's context on every request — 4.9% of a 200k window spent before your agent does anything.

QUICK ANSWER The Gastos Flow MCP server's tool definitions consume 9,734 tokens — 5.1× the median MCP server (1,905 tokens). A scoped grant exposing only the tools you use cuts that roughly in proportion.

MEASURED FROM SCHEMAS 55 tools · 9,734 tokens · 4.9% of 200k · 1.0% of 1M Method →

// CONTEXT WINDOW SHARE

What that buys before your agent starts working.

Tool definitions are overhead: they occupy context on every request and compete with your code, documents and conversation history for the same window.

200K WINDOW 4.9%

1M WINDOW 1.0%

Corpus context: Gastos Flow ranks #176 of 3,213 measured MCP servers by definition cost. The median is 1,905 tokens, p90 is 7,952, and the heaviest (Fusionauth) is 183,337 — 92% of a 200k window on its own.

// PER-TOOL BREAKDOWN

Where the 9,734 tokens go.

Each row is one tool definition as a tools/list entry — name, description and input schema — counted with o200k_base. Average: 177 tokens per tool.

Tool	Category	Tokens	% of server
gastos_flow_create_gasto	Write	837	8.6%
gastos_flow_create_gasto_tercero	Write	715	7.3%
gastos_flow_list_gastos	Read	413	4.2%
gastos_flow_create_gasto_recurrente	Write	406	4.2%
gastos_flow_list_ingresos	Read	395	4.1%
gastos_flow_update_gasto	Write	376	3.9%
gastos_flow_create_cuenta	Write	330	3.4%
gastos_flow_create_ingreso	Write	289	3.0%
gastos_flow_create_deuda_propia	Write	275	2.8%
gastos_flow_list_deudas_propias	Read	269	2.8%
gastos_flow_create_deuda_cobrar	Write	264	2.7%
gastos_flow_update_gasto_recurrente	Write	262	2.7%
gastos_flow_list_deudas_cobrar	Read	243	2.5%
gastos_flow_update_cuenta	Write	219	2.2%
gastos_flow_update_deuda_cobrar	Write	209	2.1%
gastos_flow_update_deuda_propia	Write	205	2.1%
gastos_flow_create_categoria	Write	199	2.0%
gastos_flow_update_ingreso	Write	199	2.0%
gastos_flow_login	Write	184	1.9%
gastos_flow_update_categoria	Write	177	1.8%
gastos_flow_create_moneda	Write	155	1.6%
gastos_flow_marcar_deuda_propia_pagada	Write	140	1.4%
gastos_flow_update_moneda	Write	130	1.3%
gastos_flow_marcar_deuda_cobrada	Write	127	1.3%
gastos_flow_get_gasto	Read	115	1.2%
gastos_flow_list_categorias	Read	115	1.2%
gastos_flow_get_perfil	Read	111	1.1%
gastos_flow_update_origen	Write	111	1.1%
gastos_flow_update_persona	Write	110	1.1%
gastos_flow_delete_gasto	Destructive	108	1.1%
gastos_flow_create_origen	Write	99	1.0%
gastos_flow_create_persona	Write	94	1.0%
gastos_flow_delete_gasto_recurrente	Destructive	92	0.9%
gastos_flow_delete_deuda_cobrar	Destructive	91	0.9%
gastos_flow_activar_gasto_recurrente	Write	91	0.9%
gastos_flow_get_ingreso	Read	90	0.9%
gastos_flow_desactivar_gasto_recurrente	Write	90	0.9%
gastos_flow_delete_deuda_propia	Destructive	89	0.9%
gastos_flow_delete_origen	Destructive	87	0.9%
gastos_flow_get_gasto_recurrente	Read	87	0.9%
gastos_flow_delete_cuenta	Destructive	86	0.9%
gastos_flow_delete_moneda	Destructive	86	0.9%
gastos_flow_delete_persona	Destructive	86	0.9%
gastos_flow_get_deuda_cobrar	Read	86	0.9%
gastos_flow_delete_categoria	Destructive	85	0.9%
gastos_flow_delete_ingreso	Destructive	85	0.9%
gastos_flow_get_cuenta	Read	85	0.9%
gastos_flow_get_categoria	Read	84	0.9%
gastos_flow_get_deuda_propia	Read	84	0.9%
gastos_flow_logout	Write	73	0.7%
gastos_flow_list_gastos_recurrentes	Read	71	0.7%
gastos_flow_list_personas	Read	66	0.7%
gastos_flow_list_origenes	Read	55	0.6%
gastos_flow_list_cuentas	Read	52	0.5%
gastos_flow_list_monedas	Read	52	0.5%

// SCOPED GRANT

Most agents use a handful of these tools. They pay for all 55.

A PolicyLayer grant exposes only the tools you allow — ungranted definitions are filtered out of the tool list, so they never enter the context window. Estimates below assume typical-weight tools (177 tokens each).

Grant scope	Definition cost	Reduction
All 55 tools (no gateway)	9,734 tokens	—
3 granted tools	~531 tokens	−95%
5 granted tools	~885 tokens	−91%
10 granted tools	~1,770 tokens	−82%

Model your own stack in the token-cost calculator, or see the Gastos Flow policy for what a sensible grant looks like.

//FAQ

Gastos Flow token-cost questions.

How many tokens does the Gastos Flow MCP server use?+

Its 55 tool definitions total 9,734 tokens — 4.9% of a 200k context window — measured with tiktoken o200k_base over the serialised tools/list payload. Exact counts vary slightly by client and model.

Why does Gastos Flow consume tokens before I send a message?+

MCP clients load every connected server's tool definitions — name, description, and input schema — into the model's context so it knows what it can call. That payload is charged against your context window on every request, whether or not a tool is used.

How do I reduce Gastos Flow's token usage?+

Expose fewer tools. A PolicyLayer grant scopes Gastos Flow to only the tools you allow — ungranted definitions are filtered out of the tool list, so they never enter the context window. A grant of 3 typical tools costs roughly 531 tokens, a 95% reduction.

Does deferred tool loading fix this?+

Partially, in some clients. Claude Code defers MCP tool schemas behind a tool-search step by default, and VS Code has experimental grouping — but you still pay tokens per search and reload, and Cursor, Windsurf and Gemini CLI load definitions upfront. Reducing the exposed tool set cuts the cost in every client.

// METHOD & REVIEW

How these numbers were measured.

Serialisation

Each tool is serialised as a tools/list entry — name, description, input schema — from the schemas in the PolicyLayer scan database. Clients differ slightly in framing, so treat counts as close estimates.

Tokeniser

tiktoken o200k_base (GPT-4o/o-series). Anthropic's current tokeniser isn't published, so Claude's exact counts will differ; for English text and JSON schemas the totals are close enough to treat these as estimates.

Deferred loading

Some clients now defer schema loading (Claude Code's tool search; VS Code experimental grouping). You still pay per search and reload — and Cursor, Windsurf and Gemini CLI load everything upfront.

Computed 07-06-2026 from the PolicyLayer scan database over all 55 catalogued Gastos Flow tools. Counts refresh with every site build.

Expose only the tools you use — the rest never enter your context.

A PolicyLayer grant scopes Gastos Flow to the tools you actually allow. Ungranted definitions never load, and every call that does run is checked against policy first.

SCOPE YOUR GRANT →

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