diff --git a/README.md b/README.md
index d58a8851..9d7a9537 100644
--- a/README.md
+++ b/README.md
@@ -655,6 +655,12 @@ Example keymap for silent add:
 ['<leader>oY'] = { 'add_visual_selection', { open_input = false }, mode = {'v'} }
 ```
 
+Example keymap for toggling a specific context using a parameterized API action:
+
+```lua
+['<leader>ocf'] = { 'toggle_context#current_file', desc = 'Toggle current file context' }
+```
+
 ### Run opts
 
 You can pass additional options when running a prompt via command or API:
diff --git a/lua/opencode/api.lua b/lua/opencode/api.lua
index 41235179..405665e3 100644
--- a/lua/opencode/api.lua
+++ b/lua/opencode/api.lua
@@ -236,6 +236,12 @@ function M.quick_chat(message, range)
   quick_chat.quick_chat(prompt, { context_config = ctx }, range)
 end
 
+---@param context_key OpencodeToggleableContextKey
+---@return boolean|nil enabled
+function M.toggle_context(context_key)
+  return require('opencode.context').toggle_context(context_key)
+end
+
 function M.toggle_pane()
   ui.toggle_pane()
 end
diff --git a/lua/opencode/keymap.lua b/lua/opencode/keymap.lua
index fa1f7fa4..40b665d2 100644
--- a/lua/opencode/keymap.lua
+++ b/lua/opencode/keymap.lua
@@ -26,8 +26,14 @@ local function process_keymap_entry(keymap_config, default_modes, base_opts, def
       -- Skip keymap if explicitly set to false (disabled)
     elseif config_entry then
       local func_name = config_entry[1]
-      local func_args = config_entry[2]
-      local raw_callback = type(func_name) == 'function' and func_name or api[func_name]
+      local resolved_func_name = func_name
+      local inline_arg = nil
+      if type(func_name) == 'string' then
+        resolved_func_name, inline_arg = func_name:match('^([^#]+)#(.+)$')
+        resolved_func_name = resolved_func_name or func_name
+      end
+      local func_args = config_entry[2] or inline_arg
+      local raw_callback = type(func_name) == 'function' and func_name or api[resolved_func_name]
       local callback = raw_callback
 
       if raw_callback and func_args then
@@ -38,7 +44,7 @@ local function process_keymap_entry(keymap_config, default_modes, base_opts, def
 
       local modes = config_entry.mode or default_modes
       local opts = vim.tbl_deep_extend('force', {}, base_opts)
-      opts.desc = config_entry.desc or cmds[func_name] and cmds[func_name].desc
+      opts.desc = config_entry.desc or cmds[resolved_func_name] and cmds[resolved_func_name].desc
 
       if callback then
         if defer_to_completion then
diff --git a/lua/opencode/types.lua b/lua/opencode/types.lua
index 6ad6aabf..a3f1fa56 100644
--- a/lua/opencode/types.lua
+++ b/lua/opencode/types.lua
@@ -65,7 +65,7 @@
 ---@field share? SessionShareInfo
 
 ---@class OpencodeKeymapEntry
----@field [1] string # Function name
+---@field [1] string # Function name, optionally suffixed with #<arg> to pass one string arg
 ---@field mode? string|string[] # Mode(s) for the keymap
 ---@field desc? string # Keymap description
 
diff --git a/tests/unit/api_spec.lua b/tests/unit/api_spec.lua
index d77babe9..85cea520 100644
--- a/tests/unit/api_spec.lua
+++ b/tests/unit/api_spec.lua
@@ -1,6 +1,7 @@
 local api = require('opencode.api')
 local core = require('opencode.core')
 local ui = require('opencode.ui.ui')
+local context = require('opencode.context')
 local state = require('opencode.state')
 local stub = require('luassert.stub')
 local assert = require('luassert')
@@ -104,6 +105,12 @@ describe('opencode.api', function()
         new_session = true,
         focus = 'output',
       })
+
+      assert.is_function(api.toggle_context, 'Should export toggle_context')
+      stub(context, 'toggle_context').returns(true)
+      local enabled = api.toggle_context('current_file')
+      assert.is_true(enabled)
+      assert.stub(context.toggle_context).was_called_with('current_file')
     end)
   end)
 
diff --git a/tests/unit/keymap_spec.lua b/tests/unit/keymap_spec.lua
index 9acedda2..5f60cfd6 100644
--- a/tests/unit/keymap_spec.lua
+++ b/tests/unit/keymap_spec.lua
@@ -39,6 +39,7 @@ describe('opencode.keymap', function()
     mock_api = {
       open_input = function() end,
       toggle = function() end,
+      toggle_context = function() end,
       submit_input_prompt = function() end,
       permission_accept = function() end,
       permission_accept_all = function() end,
@@ -46,6 +47,7 @@ describe('opencode.keymap', function()
       commands = {
         open_input = { desc = 'Open input window' },
         toggle = { desc = 'Toggle opencode windows' },
+        toggle_context = { desc = 'Toggle prompt context' },
         submit_input_prompt = { desc = 'Submit input prompt' },
       },
     }
@@ -159,6 +161,27 @@ describe('opencode.keymap', function()
       assert.is_not_nil(keymap_entry.opts.desc, 'Should have a description from API fallback')
       assert.equal('Toggle opencode windows', keymap_entry.opts.desc)
     end)
+
+    it('supports parameterized function names with #suffix', function()
+      local called_with = nil
+      mock_api.toggle_context = function(context_key)
+        called_with = context_key
+      end
+
+      local test_keymap = {
+        editor = {
+          ['<leader>tcf'] = { 'toggle_context#current_file' },
+        },
+      }
+
+      keymap.setup(test_keymap)
+
+      assert.equal(1, #set_keymaps, 'Should set up 1 keymap')
+      assert.equal('Toggle prompt context', set_keymaps[1].opts.desc)
+
+      set_keymaps[1].callback()
+      assert.equal('current_file', called_with)
+    end)
   end)
 
   describe('setup_window_keymaps', function()